diff --git a/test/helper/common.bash b/test/helper/common.bash
index 1f38b132..2eba1086 100644
--- a/test/helper/common.bash
+++ b/test/helper/common.bash
@@ -30,10 +30,10 @@ function _default_teardown() {
 
 # @param ${1} program name [REQUIRED]
 # @param ${2} container name [IF UNSET: ${CONTAINER_NAME}]
-function _check_if_process_is_running() {
+function check_if_process_is_running() {
   local PROGRAM_NAME=${1:?Program name must be provided explicitly}
   local CONTAINER_NAME=${2:-${CONTAINER_NAME}}
-  _run_in_container_explicit "${CONTAINER_NAME}" pgrep "${PROGRAM_NAME}"
+  docker exec "${CONTAINER_NAME}" pgrep "${PROGRAM_NAME}"
 }
 
 # -------------------------------------------------------------------
diff --git a/test/tests/parallel/set1/default_relay_host.bats b/test/tests/parallel/set1/default_relay_host.bats
index ead7925e..9b79361a 100644
--- a/test/tests/parallel/set1/default_relay_host.bats
+++ b/test/tests/parallel/set1/default_relay_host.bats
@@ -1,15 +1,15 @@
 load "${REPOSITORY_ROOT}/test/helper/setup"
 load "${REPOSITORY_ROOT}/test/helper/common"
 
-export TEST_NAME_PREFIX='default relay host:'
-export CONTAINER_NAME='dms-test-default_relay_host'
+TEST_NAME_PREFIX='[Relay] ENV:'
+CONTAINER_NAME='dms-test_default-relay-host'
 
 function setup_file() {
   init_with_defaults
 
   local CUSTOM_SETUP_ARGUMENTS=(
-    --env DEFAULT_RELAY_HOST=default.relay.host.invalid:25 \
-    --env PERMIT_DOCKER=host \
+    --env DEFAULT_RELAY_HOST=default.relay.host.invalid:25
+    --env PERMIT_DOCKER=host
   )
 
   common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
@@ -17,7 +17,7 @@ function setup_file() {
 
 function teardown_file() { _default_teardown ; }
 
-@test "${TEST_NAME_PREFIX} default relay host is added to main.cf" {
+@test "${TEST_NAME_PREFIX} 'DEFAULT_RELAY_HOST' should configure 'main.cf:relayhost'" {
   _run_in_container bash -c 'grep -e "^relayhost =" /etc/postfix/main.cf'
   assert_output 'relayhost = default.relay.host.invalid:25'
 }
diff --git a/test/tests/parallel/set1/spam_virus/clamav.bats b/test/tests/parallel/set1/spam_virus/clamav.bats
index 42450926..1a894750 100644
--- a/test/tests/parallel/set1/spam_virus/clamav.bats
+++ b/test/tests/parallel/set1/spam_virus/clamav.bats
@@ -2,7 +2,7 @@ load "${REPOSITORY_ROOT}/test/helper/setup"
 load "${REPOSITORY_ROOT}/test/helper/common"
 
 TEST_NAME_PREFIX='ClamAV:'
-CONTAINER_NAME='dms-test-clamav'
+CONTAINER_NAME='dms-test_clamav'
 
 function setup_file() {
   init_with_defaults
@@ -35,7 +35,7 @@ function setup_file() {
 function teardown_file() { _default_teardown ; }
 
 @test "${TEST_NAME_PREFIX} process clamd is running" {
-  _run_in_container bash -c "ps aux --forest | grep -v grep | grep '/usr/sbin/clamd'"
+  run check_if_process_is_running 'clamd'
   assert_success
 }
 
@@ -66,6 +66,8 @@ function teardown_file() { _default_teardown ; }
 }
 
 @test "${TEST_NAME_PREFIX} process clamd restarts when killed" {
-  _run_in_container bash -c "pkill clamd && sleep 10 && ps aux --forest | grep -v grep | grep '/usr/sbin/clamd'"
+  _run_in_container pkill 'clamd'
   assert_success
+
+  run_until_success_or_timeout 10 check_if_process_is_running 'clamd'
 }
diff --git a/test/tests/parallel/set1/spam_virus/disabled_clamav_spamassassin.bats b/test/tests/parallel/set1/spam_virus/disabled_clamav_spamassassin.bats
index 83e6a398..23fd00c0 100644
--- a/test/tests/parallel/set1/spam_virus/disabled_clamav_spamassassin.bats
+++ b/test/tests/parallel/set1/spam_virus/disabled_clamav_spamassassin.bats
@@ -1,48 +1,50 @@
-load "${REPOSITORY_ROOT}/test/test_helper/common"
+load "${REPOSITORY_ROOT}/test/helper/setup"
+load "${REPOSITORY_ROOT}/test/helper/common"
 
-setup_file() {
-  local PRIVATE_CONFIG
-  PRIVATE_CONFIG=$(duplicate_config_for_container .)
+TEST_NAME_PREFIX='[ClamAV + SA] (disabled):'
+CONTAINER_NAME='dms-test_clamav-spamassasin_disabled'
 
-  docker run --rm -d --name mail_disabled_clamav_spamassassin \
-    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
-    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
-    -e ENABLE_CLAMAV=0 \
-    -e ENABLE_SPAMASSASSIN=0 \
-    -e AMAVIS_LOGLEVEL=2 \
-    -h mail.my-domain.com -t "${NAME}"
+function setup_file() {
+  init_with_defaults
 
-    # TODO: find a better way to know when we have waited long enough
-    #       for ClamAV to should have come up, if it were enabled
-    wait_for_smtp_port_in_container mail_disabled_clamav_spamassassin
-    docker exec mail_disabled_clamav_spamassassin /bin/sh -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/existing-user1.txt"
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env ENABLE_AMAVIS=1
+    --env ENABLE_CLAMAV=0
+    --env ENABLE_SPAMASSASSIN=0
+    --env AMAVIS_LOGLEVEL=2
+  )
+
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
+  wait_for_smtp_port_in_container "${CONTAINER_NAME}"
+
+  _run_in_container bash -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/existing-user1.txt"
+  assert_success
+  wait_for_empty_mail_queue_in_container "${CONTAINER_NAME}"
 }
 
-teardown_file() {
-    docker rm -f mail_disabled_clamav_spamassassin
-}
+function teardown_file() { _default_teardown ; }
 
-@test "checking process: ClamAV (ClamAV disabled by ENABLED_CLAMAV=0)" {
-  run docker exec mail_disabled_clamav_spamassassin /bin/bash -c "ps aux --forest | grep -v grep | grep '/usr/sbin/clamd'"
+@test "${TEST_NAME_PREFIX} ClamAV - should be disabled by ENV 'ENABLED_CLAMAV=0'" {
+  run check_if_process_is_running 'clamd'
   assert_failure
 }
 
-@test "checking spamassassin: should not be listed in amavis when disabled" {
-  run docker exec mail_disabled_clamav_spamassassin /bin/sh -c "grep -i 'ANTI-SPAM-SA code' /var/log/mail/mail.log | grep 'NOT loaded'"
+@test "${TEST_NAME_PREFIX} SA - Amavis integration should not be active" {
+  _run_in_container /bin/sh -c "grep -i 'ANTI-SPAM-SA code' /var/log/mail/mail.log | grep 'NOT loaded'"
   assert_success
 }
 
-@test "checking ClamAV: should not be listed in amavis when disabled" {
-  run docker exec mail_disabled_clamav_spamassassin grep -i 'Found secondary av scanner ClamAV-clamscan' /var/log/mail/mail.log
+@test "${TEST_NAME_PREFIX} ClamAV - Amavis integration should not be active" {
+  _run_in_container grep -i 'Found secondary av scanner ClamAV-clamscan' /var/log/mail/mail.log
   assert_failure
 }
 
-@test "checking ClamAV: should not be called when disabled" {
-  run docker exec mail_disabled_clamav_spamassassin grep -i 'connect to /var/run/clamav/clamd.ctl failed' /var/log/mail/mail.log
+@test "${TEST_NAME_PREFIX} SA should not be called" {
+  _run_in_container grep -i 'connect to /var/run/clamav/clamd.ctl failed' /var/log/mail/mail.log
   assert_failure
 }
 
-@test "checking restart of process: ClamAV (ClamAV disabled by ENABLED_CLAMAV=0)" {
-  run docker exec mail_disabled_clamav_spamassassin /bin/bash -c "pkill -f clamd && sleep 10 && ps aux --forest | grep -v grep | grep '/usr/sbin/clamd'"
+@test "${TEST_NAME_PREFIX} ClamAV process should not be restarted when killed" {
+  _run_in_container /bin/bash -c "pkill -f clamd && sleep 10 && ps aux --forest | grep -v grep | grep '/usr/sbin/clamd'"
   assert_failure
 }
diff --git a/test/tests/parallel/set1/spam_virus/dnsbl.bats b/test/tests/parallel/set1/spam_virus/dnsbl.bats
index d4c3a5d4..11cc7ae2 100644
--- a/test/tests/parallel/set1/spam_virus/dnsbl.bats
+++ b/test/tests/parallel/set1/spam_virus/dnsbl.bats
@@ -1,61 +1,61 @@
-load "${REPOSITORY_ROOT}/test/test_helper/common"
+load "${REPOSITORY_ROOT}/test/helper/setup"
+load "${REPOSITORY_ROOT}/test/helper/common"
 
-CONTAINER="mail_dnsbl_enabled"
-CONTAINER2="mail_dnsbl_disabled"
+TEST_NAME_PREFIX='DNSBLs:'
+
+CONTAINER1_NAME='dms-test_dnsbl_enabled'
+CONTAINER2_NAME='dms-test_dnsbl_disabled'
 
 function setup_file() {
-  local PRIVATE_CONFIG
-  PRIVATE_CONFIG=$(duplicate_config_for_container . "${CONTAINER}")
+  local CONTAINER_NAME=${CONTAINER1_NAME}
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env ENABLE_DNSBL=1
+  )
+  init_with_defaults
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
+  wait_for_smtp_port_in_container "${CONTAINER_NAME}"
 
-  docker run --rm -d --name "${CONTAINER}" \
-    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
-    -e ENABLE_DNSBL=1 \
-    -h mail.my-domain.com \
-    -t "${NAME}"
+  local CONTAINER_NAME=${CONTAINER2_NAME}
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env ENABLE_DNSBL=0
+  )
+  init_with_defaults
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
+  wait_for_smtp_port_in_container "${CONTAINER_NAME}"
+}
 
-  docker run --rm -d --name "${CONTAINER2}" \
-    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
-    -e ENABLE_DNSBL=0 \
-    -h mail.my-domain.com \
-    -t "${NAME}"
-
-  wait_for_smtp_port_in_container "${CONTAINER}"
-  wait_for_smtp_port_in_container "${CONTAINER2}"
+function teardown_file() {
+  docker rm -f "${CONTAINER1_NAME}" "${CONTAINER2_NAME}"
 }
 
 # ENABLE_DNSBL=1
-@test "checking enabled postfix DNS block list zen.spamhaus.org" {
-  run docker exec "${CONTAINER}" postconf smtpd_recipient_restrictions
+@test "${TEST_NAME_PREFIX} (enabled) Postfix DNS block list zen.spamhaus.org" {
+  run docker exec "${CONTAINER1_NAME}" postconf smtpd_recipient_restrictions
   assert_output --partial 'reject_rbl_client zen.spamhaus.org'
 }
 
-@test "checking enabled postscreen DNS block lists --> postscreen_dnsbl_action" {
-  run docker exec "${CONTAINER}" postconf postscreen_dnsbl_action
+@test "${TEST_NAME_PREFIX} (enabled) Postscreen DNS block lists -> postscreen_dnsbl_action" {
+  run docker exec "${CONTAINER1_NAME}" postconf postscreen_dnsbl_action
   assert_output 'postscreen_dnsbl_action = enforce'
 }
 
-@test "checking enabled postscreen DNS block lists --> postscreen_dnsbl_sites" {
-  run docker exec "${CONTAINER}" postconf postscreen_dnsbl_sites
+@test "${TEST_NAME_PREFIX} (enabled) Postscreen DNS block lists -> postscreen_dnsbl_sites" {
+  run docker exec "${CONTAINER1_NAME}" postconf postscreen_dnsbl_sites
   assert_output 'postscreen_dnsbl_sites = zen.spamhaus.org=127.0.0.[2..11]*3 bl.mailspike.net=127.0.0.[2;14;13;12;11;10] b.barracudacentral.org*2 bl.spameatingmonkey.net=127.0.0.2 dnsbl.sorbs.net psbl.surriel.com list.dnswl.org=127.0.[0..255].0*-2 list.dnswl.org=127.0.[0..255].1*-3 list.dnswl.org=127.0.[0..255].[2..3]*-4'
 }
 
 # ENABLE_DNSBL=0
-@test "checking disabled postfix DNS block list zen.spamhaus.org" {
-  run docker exec "${CONTAINER2}" postconf smtpd_recipient_restrictions
+@test "${TEST_NAME_PREFIX} (disabled) Postfix DNS block list zen.spamhaus.org" {
+  run docker exec "${CONTAINER2_NAME}" postconf smtpd_recipient_restrictions
   refute_output --partial 'reject_rbl_client zen.spamhaus.org'
 }
 
-@test "checking disabled postscreen DNS block lists --> postscreen_dnsbl_action" {
-  run docker exec "${CONTAINER2}" postconf postscreen_dnsbl_action
+@test "${TEST_NAME_PREFIX} (disabled) Postscreen DNS block lists -> postscreen_dnsbl_action" {
+  run docker exec "${CONTAINER2_NAME}" postconf postscreen_dnsbl_action
   assert_output 'postscreen_dnsbl_action = ignore'
 }
 
-@test "checking disabled postscreen DNS block lists --> postscreen_dnsbl_sites" {
-  run docker exec "${CONTAINER2}" postconf postscreen_dnsbl_sites
+@test "${TEST_NAME_PREFIX} (disabled) Postscreen DNS block lists -> postscreen_dnsbl_sites" {
+  run docker exec "${CONTAINER2_NAME}" postconf postscreen_dnsbl_sites
   assert_output 'postscreen_dnsbl_sites ='
 }
-
-# cleanup
-function teardown_file() {
-    docker rm -f "${CONTAINER}" "${CONTAINER2}"
-}
diff --git a/test/tests/parallel/set1/spam_virus/fail2ban.bats b/test/tests/parallel/set1/spam_virus/fail2ban.bats
index a3f927d7..29a5e620 100644
--- a/test/tests/parallel/set1/spam_virus/fail2ban.bats
+++ b/test/tests/parallel/set1/spam_virus/fail2ban.bats
@@ -1,88 +1,90 @@
-load "${REPOSITORY_ROOT}/test/test_helper/common"
+load "${REPOSITORY_ROOT}/test/helper/setup"
+load "${REPOSITORY_ROOT}/test/helper/common"
+
+TEST_NAME_PREFIX='Fail2Ban:'
+CONTAINER1_NAME='dms-test_fail2ban'
+CONTAINER2_NAME='dms-test_fail2ban_fail-auth-mailer'
+
+function get_container2_ip() {
+  docker inspect --format '{{ .NetworkSettings.IPAddress }}' "${CONTAINER2_NAME}"
+}
 
 function setup_file() {
-  local PRIVATE_CONFIG
-  PRIVATE_CONFIG=$(duplicate_config_for_container .)
-  docker run --rm -d --name mail_fail2ban \
-    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
-    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
-    -e ENABLE_FAIL2BAN=1 \
-    -e POSTSCREEN_ACTION=ignore \
-    --cap-add=NET_ADMIN \
-    --hostname mail.my-domain.com \
-    --tty \
-    --ulimit "nofile=$(ulimit -Sn):$(ulimit -Hn)" \
-    "${NAME}"
+  export CONTAINER_NAME
+
+  CONTAINER_NAME=${CONTAINER1_NAME}
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env ENABLE_FAIL2BAN=1
+    --env POSTSCREEN_ACTION=ignore
+    --cap-add=NET_ADMIN
+    --ulimit "nofile=$(ulimit -Sn):$(ulimit -Hn)"
+  )
+  init_with_defaults
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
+  wait_for_smtp_port_in_container "${CONTAINER_NAME}"
 
   # Create a container which will send wrong authentications and should get banned
-  docker run --name fail-auth-mailer \
-    -e MAIL_FAIL2BAN_IP="$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' mail_fail2ban)" \
-    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test \
-    -d "${NAME}" \
-    tail -f /var/log/faillog
+  CONTAINER_NAME=${CONTAINER2_NAME}
+  local CUSTOM_SETUP_ARGUMENTS=(--env MAIL_FAIL2BAN_IP="$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' ${CONTAINER1_NAME})")
+  init_with_defaults
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
 
-  wait_for_finished_setup_in_container mail_fail2ban
+  # Set default implicit container fallback for helpers:
+  CONTAINER_NAME=${CONTAINER1_NAME}
 }
 
 function teardown_file() {
-  docker rm -f mail_fail2ban fail-auth-mailer
+  docker rm -f "${CONTAINER1_NAME}" "${CONTAINER2_NAME}"
 }
 
-#
-# processes
-#
-
-@test "checking process: fail2ban (fail2ban server enabled)" {
-  run docker exec mail_fail2ban /bin/bash -c "ps aux --forest | grep -v grep | grep '/usr/bin/python3 /usr/bin/fail2ban-server'"
+@test "${TEST_NAME_PREFIX} Fail2Ban is running" {
+  run check_if_process_is_running 'fail2ban-server'
   assert_success
 }
 
-#
-# fail2ban
-#
+@test "${TEST_NAME_PREFIX} localhost is not banned because ignored" {
+  _run_in_container fail2ban-client status postfix-sasl
+  assert_success
+  refute_output --regexp '.*IP list:.*127\.0\.0\.1.*'
 
-@test "checking fail2ban: localhost is not banned because ignored" {
-  run docker exec mail_fail2ban /bin/sh -c "fail2ban-client status postfix-sasl | grep 'IP list:.*127.0.0.1'"
-  assert_failure
-  run docker exec mail_fail2ban /bin/sh -c "grep 'ignoreip = 127.0.0.1/8' /etc/fail2ban/jail.conf"
+  _run_in_container grep 'ignoreip = 127.0.0.1/8' /etc/fail2ban/jail.conf
   assert_success
 }
 
-@test "checking fail2ban: fail2ban-fail2ban.cf overrides" {
-  run docker exec mail_fail2ban /bin/sh -c "fail2ban-client get loglevel | grep DEBUG"
+@test "${TEST_NAME_PREFIX} fail2ban-fail2ban.cf overrides" {
+  _run_in_container fail2ban-client get loglevel
   assert_success
+  assert_output --partial 'DEBUG'
 }
 
-@test "checking fail2ban: fail2ban-jail.cf overrides" {
-  FILTERS=(dovecot postfix postfix-sasl)
-
-  for FILTER in "${FILTERS[@]}"; do
-    run docker exec mail_fail2ban /bin/sh -c "fail2ban-client get ${FILTER} bantime"
+@test "${TEST_NAME_PREFIX} fail2ban-jail.cf overrides" {
+  for FILTER in 'dovecot' 'postfix' 'postfix-sasl'
+  do
+    _run_in_container fail2ban-client get "${FILTER}" bantime
     assert_output 1234
 
-    run docker exec mail_fail2ban /bin/sh -c "fail2ban-client get ${FILTER} findtime"
+    _run_in_container fail2ban-client get "${FILTER}" findtime
     assert_output 321
 
-    run docker exec mail_fail2ban /bin/sh -c "fail2ban-client get ${FILTER} maxretry"
+    _run_in_container fail2ban-client get "${FILTER}" maxretry
     assert_output 2
 
-    run docker exec mail_fail2ban /bin/sh -c "fail2ban-client -d | grep -F \"['set', 'dovecot', 'addaction', 'nftables-multiport']\""
-    assert_output "['set', 'dovecot', 'addaction', 'nftables-multiport']"
-
-    run docker exec mail_fail2ban /bin/sh -c "fail2ban-client -d | grep -F \"['set', 'postfix', 'addaction', 'nftables-multiport']\""
-    assert_output "['set', 'postfix', 'addaction', 'nftables-multiport']"
-
-    run docker exec mail_fail2ban /bin/sh -c "fail2ban-client -d | grep -F \"['set', 'postfix-sasl', 'addaction', 'nftables-multiport']\""
-    assert_output "['set', 'postfix-sasl', 'addaction', 'nftables-multiport']"
+    _run_in_container fail2ban-client -d
+    assert_output --partial "['set', 'dovecot', 'addaction', 'nftables-multiport']"
+    assert_output --partial "['set', 'postfix', 'addaction', 'nftables-multiport']"
+    assert_output --partial "['set', 'postfix-sasl', 'addaction', 'nftables-multiport']"
   done
 }
 
-@test "checking fail2ban: ban ip on multiple failed login" {
-  # can't pipe the file as usual due to postscreen. (respecting postscreen_greet_wait time and talking in turn):
+# NOTE: This test case is fragile if other test cases were to be run concurrently
+@test "${TEST_NAME_PREFIX} ban ip on multiple failed login" {
+  # can't pipe the file as usual due to postscreen
+  # respecting postscreen_greet_wait time and talking in turn):
+
   # shellcheck disable=SC1004
   for _ in {1,2}
   do
-    docker exec fail-auth-mailer /bin/bash -c \
+    docker exec "${CONTAINER2_NAME}" /bin/bash -c \
     'exec 3<>/dev/tcp/${MAIL_FAIL2BAN_IP}/25 && \
     while IFS= read -r cmd; do \
       head -1 <&3; \
@@ -93,108 +95,123 @@ function teardown_file() {
 
   sleep 5
 
-  FAIL_AUTH_MAILER_IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' fail-auth-mailer)
-  # Checking that FAIL_AUTH_MAILER_IP is banned in mail_fail2ban
-  run docker exec mail_fail2ban /bin/sh -c "fail2ban-client status postfix-sasl | grep '${FAIL_AUTH_MAILER_IP}'"
+  # Checking that CONTAINER2_IP is banned in "${CONTAINER1_NAME}"
+  CONTAINER2_IP=$(get_container2_ip)
+  _run_in_container fail2ban-client status postfix-sasl
   assert_success
+  assert_output --partial "${CONTAINER2_IP}"
 
-  # Checking that FAIL_AUTH_MAILER_IP is banned by nftables
-  run docker exec mail_fail2ban /bin/sh -c "nft list set inet f2b-table addr-set-postfix-sasl"
-  assert_output --partial "elements = { ${FAIL_AUTH_MAILER_IP} }"
+  # Checking that CONTAINER2_IP is banned by nftables
+  _run_in_container bash -c 'nft list set inet f2b-table addr-set-postfix-sasl'
+  assert_success
+  assert_output --partial "elements = { ${CONTAINER2_IP} }"
 }
 
-@test "checking fail2ban: unban ip works" {
-  FAIL_AUTH_MAILER_IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' fail-auth-mailer)
-  docker exec mail_fail2ban fail2ban-client set postfix-sasl unbanip "${FAIL_AUTH_MAILER_IP}"
-
+@test "${TEST_NAME_PREFIX} unban ip works" {
+  CONTAINER2_IP=$(get_container2_ip)
+  _run_in_container fail2ban-client set postfix-sasl unbanip "${CONTAINER2_IP}"
+  assert_success
   sleep 5
 
-  run docker exec mail_fail2ban /bin/sh -c "fail2ban-client status postfix-sasl | grep 'IP list:.*${FAIL_AUTH_MAILER_IP}'"
-  assert_failure
+  # Checking that CONTAINER2_IP is unbanned in "${CONTAINER1_NAME}"
+  _run_in_container fail2ban-client status postfix-sasl
+  assert_success
+  refute_output --partial "${CONTAINER2_IP}"
 
-  # Checking that FAIL_AUTH_MAILER_IP is unbanned by nftables
-  run docker exec mail_fail2ban /bin/sh -c "nft list set inet f2b-table addr-set-postfix-sasl"
-  refute_output --partial "${FAIL_AUTH_MAILER_IP}"
+  # Checking that CONTAINER2_IP is unbanned by nftables
+  _run_in_container bash -c 'nft list set inet f2b-table addr-set-postfix-sasl'
+  refute_output --partial "${CONTAINER2_IP}"
 }
 
-@test "checking fail2ban ban" {
-  # Ban single IP address
-  run docker exec mail_fail2ban fail2ban ban 192.0.66.7
+@test "${TEST_NAME_PREFIX} bans work properly (single IP)" {
+  _run_in_container fail2ban ban 192.0.66.7
   assert_success
-  assert_output "Banned custom IP: 1"
+  assert_output 'Banned custom IP: 1'
 
-  run docker exec mail_fail2ban fail2ban
+  _run_in_container fail2ban
   assert_success
-  assert_output --regexp "Banned in custom:.*192\.0\.66\.7"
+  assert_output --regexp 'Banned in custom:.*192\.0\.66\.7'
 
-  run docker exec mail_fail2ban nft list set inet f2b-table addr-set-custom
+  _run_in_container nft list set inet f2b-table addr-set-custom
   assert_success
-  assert_output --partial "elements = { 192.0.66.7 }"
+  assert_output --partial 'elements = { 192.0.66.7 }'
 
-  run docker exec mail_fail2ban fail2ban unban 192.0.66.7
+  _run_in_container fail2ban unban 192.0.66.7
   assert_success
-  assert_output --partial "Unbanned IP from custom: 1"
+  assert_output --partial 'Unbanned IP from custom: 1'
 
-  run docker exec mail_fail2ban nft list set inet f2b-table addr-set-custom
-  refute_output --partial "192.0.66.7"
-
-  # Ban IP network
-  run docker exec mail_fail2ban fail2ban ban 192.0.66.0/24
-  assert_success
-  assert_output "Banned custom IP: 1"
-
-  run docker exec mail_fail2ban fail2ban
-  assert_success
-  assert_output --regexp "Banned in custom:.*192\.0\.66\.0/24"
-
-  run docker exec mail_fail2ban nft list set inet f2b-table addr-set-custom
-  assert_success
-  assert_output --partial "elements = { 192.0.66.0/24 }"
-
-  run docker exec mail_fail2ban fail2ban unban 192.0.66.0/24
-  assert_success
-  assert_output --partial "Unbanned IP from custom: 1"
-
-  run docker exec mail_fail2ban nft list set inet f2b-table addr-set-custom
-  refute_output --partial "192.0.66.0/24"
+  _run_in_container nft list set inet f2b-table addr-set-custom
+  refute_output --partial '192.0.66.7'
 }
 
-@test "checking FAIL2BAN_BLOCKTYPE is really set to drop" {
-  run docker exec mail_fail2ban bash -c 'nft list table inet f2b-table'
+@test "${TEST_NAME_PREFIX} bans work properly (subnet)" {
+  _run_in_container fail2ban ban 192.0.66.0/24
+  assert_success
+  assert_output 'Banned custom IP: 1'
+
+  _run_in_container fail2ban
+  assert_success
+  assert_output --regexp 'Banned in custom:.*192\.0\.66\.0/24'
+
+  _run_in_container nft list set inet f2b-table addr-set-custom
+  assert_success
+  assert_output --partial 'elements = { 192.0.66.0/24 }'
+
+  _run_in_container fail2ban unban 192.0.66.0/24
+  assert_success
+  assert_output --partial 'Unbanned IP from custom: 1'
+
+  _run_in_container nft list set inet f2b-table addr-set-custom
+  refute_output --partial '192.0.66.0/24'
+}
+
+@test "${TEST_NAME_PREFIX} FAIL2BAN_BLOCKTYPE is really set to drop" {
+  # ban IPs here manually so we can be sure something is inside the jails
+  for JAIL in dovecot postfix-sasl custom; do
+    _run_in_container fail2ban-client set "${JAIL}" banip 192.33.44.55
+    assert_success
+  done
+
+  _run_in_container nft list table inet f2b-table
   assert_success
   assert_output --partial 'tcp dport { 110, 143, 465, 587, 993, 995, 4190 } ip saddr @addr-set-dovecot drop'
   assert_output --partial 'tcp dport { 25, 110, 143, 465, 587, 993, 995 } ip saddr @addr-set-postfix-sasl drop'
   assert_output --partial 'tcp dport { 25, 110, 143, 465, 587, 993, 995, 4190 } ip saddr @addr-set-custom drop'
+
+  # unban the IPs previously banned to get a clean state again
+  for JAIL in dovecot postfix-sasl custom; do
+    _run_in_container fail2ban-client set "${JAIL}" unbanip 192.33.44.55
+    assert_success
+  done
 }
 
-@test "checking setup.sh: setup.sh fail2ban" {
-  run docker exec mail_fail2ban /bin/sh -c "fail2ban-client set dovecot banip 192.0.66.4"
-  run docker exec mail_fail2ban /bin/sh -c "fail2ban-client set dovecot banip 192.0.66.5"
+@test "${TEST_NAME_PREFIX} setup.sh fail2ban" {
+  _run_in_container fail2ban-client set dovecot banip 192.0.66.4
+  _run_in_container fail2ban-client set dovecot banip 192.0.66.5
 
   sleep 10
 
-  run ./setup.sh -c mail_fail2ban fail2ban
+  # Originally: run ./setup.sh -c "${CONTAINER1_NAME}" fail2ban
+  _run_in_container setup fail2ban
   assert_output --regexp '^Banned in dovecot:.*192\.0\.66\.4'
   assert_output --regexp '^Banned in dovecot:.*192\.0\.66\.5'
 
-  run ./setup.sh -c mail_fail2ban fail2ban unban 192.0.66.4
+  _run_in_container setup fail2ban unban 192.0.66.4
   assert_output --partial "Unbanned IP from dovecot: 1"
 
-  run ./setup.sh -c mail_fail2ban fail2ban
-  assert_output --regexp "^Banned in dovecot:.*192\.0\.66\.5"
+  _run_in_container setup fail2ban
+  assert_output --regexp '^Banned in dovecot:.*192\.0\.66\.5'
 
-  run ./setup.sh -c mail_fail2ban fail2ban unban 192.0.66.5
-  assert_output --partial "Unbanned IP from dovecot: 1"
+  _run_in_container setup fail2ban unban 192.0.66.5
+  assert_output --partial 'Unbanned IP from dovecot: 1'
 
-  run ./setup.sh -c mail_fail2ban fail2ban unban
-  assert_output --partial "You need to specify an IP address: Run"
+  _run_in_container setup fail2ban unban
+  assert_output --partial 'You need to specify an IP address: Run'
 }
 
-#
-# supervisor
-#
-
-@test "checking restart of process: fail2ban (fail2ban server enabled)" {
-  run docker exec mail_fail2ban /bin/bash -c "pkill fail2ban && sleep 10 && ps aux --forest | grep -v grep | grep '/usr/bin/python3 /usr/bin/fail2ban-server'"
+@test "${TEST_NAME_PREFIX} restart of Fail2Ban" {
+  _run_in_container pkill fail2ban
   assert_success
+
+  run_until_success_or_timeout 10 check_if_process_is_running 'fail2ban-server'
 }
diff --git a/test/tests/parallel/set1/spam_virus/postgrey_enabled.bats b/test/tests/parallel/set1/spam_virus/postgrey_enabled.bats
index 9fd4fb12..4244d7d5 100644
--- a/test/tests/parallel/set1/spam_virus/postgrey_enabled.bats
+++ b/test/tests/parallel/set1/spam_virus/postgrey_enabled.bats
@@ -1,92 +1,92 @@
-load "${REPOSITORY_ROOT}/test/test_helper/common"
+load "${REPOSITORY_ROOT}/test/helper/setup"
+load "${REPOSITORY_ROOT}/test/helper/common"
+
+TEST_NAME_PREFIX='Postgrey (enabled):'
+CONTAINER_NAME='dms-test_postgrey_enabled'
 
 function setup_file() {
-  local PRIVATE_CONFIG
-  PRIVATE_CONFIG=$(duplicate_config_for_container .)
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env ENABLE_DNSBL=1
+    --env ENABLE_POSTGREY=1
+    --env PERMIT_DOCKER=container
+    --env POSTGREY_AUTO_WHITELIST_CLIENTS=5
+    --env POSTGREY_DELAY=15
+    --env POSTGREY_MAX_AGE=35
+    --env POSTGREY_TEXT="Delayed by Postgrey"
+  )
 
-  docker run -d --name mail_with_postgrey \
-    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
-    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
-    -e ENABLE_DNSBL=1 \
-    -e ENABLE_POSTGREY=1 \
-    -e PERMIT_DOCKER=container \
-    -e POSTGREY_AUTO_WHITELIST_CLIENTS=5 \
-    -e POSTGREY_DELAY=15 \
-    -e POSTGREY_MAX_AGE=35 \
-    -e POSTGREY_TEXT="Delayed by Postgrey" \
-    -h mail.my-domain.com -t "${NAME}"
+  init_with_defaults
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
 
-  # using postfix availability as start indicator, this might be insufficient for postgrey
-  wait_for_smtp_port_in_container mail_with_postgrey
+  # Postfix needs to be ready on port 25 for nc usage below:
+  wait_for_smtp_port_in_container "${CONTAINER_NAME}"
 }
 
-function teardown_file() {
-  docker rm -f mail_with_postgrey
-}
+function teardown_file() { _default_teardown ; }
 
-@test "checking postgrey: /etc/postfix/main.cf correctly edited" {
-  run docker exec mail_with_postgrey /bin/bash -c "grep -F 'zen.spamhaus.org=127.0.0.[2..11], check_policy_service inet:127.0.0.1:10023' /etc/postfix/main.cf | wc -l"
+@test "${TEST_NAME_PREFIX} /etc/postfix/main.cf correctly edited" {
+  _run_in_container bash -c "grep -F 'zen.spamhaus.org=127.0.0.[2..11], check_policy_service inet:127.0.0.1:10023' /etc/postfix/main.cf | wc -l"
   assert_success
   assert_output 1
 }
 
-@test "checking postgrey: /etc/default/postgrey correctly edited and has the default values" {
-  run docker exec mail_with_postgrey /bin/bash -c "grep '^POSTGREY_OPTS=\"--inet=127.0.0.1:10023 --delay=15 --max-age=35 --auto-whitelist-clients=5\"$' /etc/default/postgrey | wc -l"
+@test "${TEST_NAME_PREFIX} /etc/default/postgrey correctly edited and has the default values" {
+  _run_in_container bash -c "grep '^POSTGREY_OPTS=\"--inet=127.0.0.1:10023 --delay=15 --max-age=35 --auto-whitelist-clients=5\"$' /etc/default/postgrey | wc -l"
   assert_success
   assert_output 1
 
-  run docker exec mail_with_postgrey /bin/bash -c "grep '^POSTGREY_TEXT=\"Delayed by Postgrey\"$' /etc/default/postgrey | wc -l"
+  _run_in_container bash -c "grep '^POSTGREY_TEXT=\"Delayed by Postgrey\"$' /etc/default/postgrey | wc -l"
   assert_success
   assert_output 1
 }
 
-@test "checking process: postgrey (postgrey server enabled)" {
-  run docker exec mail_with_postgrey /bin/bash -c "ps aux --forest | grep -v grep | grep 'postgrey'"
+@test "${TEST_NAME_PREFIX} Postgrey is running" {
+  run check_if_process_is_running 'postgrey'
   assert_success
 }
 
-@test "checking postgrey: there should be a log entry about a new greylisted e-mail user@external.tld in /var/log/mail/mail.log" {
+@test "${TEST_NAME_PREFIX} there should be a log entry about a new greylisted e-mail user@external.tld in /var/log/mail/mail.log" {
   #editing the postfix config in order to ensure that postgrey handles the test e-mail. The other spam checks at smtpd_recipient_restrictions would interfere with it.
-  run docker exec mail_with_postgrey /bin/sh -c "sed -ie 's/permit_sasl_authenticated.*policyd-spf,$//g' /etc/postfix/main.cf"
-  run docker exec mail_with_postgrey /bin/sh -c "sed -ie 's/reject_unauth_pipelining.*reject_unknown_recipient_domain,$//g' /etc/postfix/main.cf"
-  run docker exec mail_with_postgrey /bin/sh -c "sed -ie 's/reject_rbl_client.*inet:127\.0\.0\.1:10023$//g' /etc/postfix/main.cf"
-  run docker exec mail_with_postgrey /bin/sh -c "sed -ie 's/smtpd_recipient_restrictions =/smtpd_recipient_restrictions = check_policy_service inet:127.0.0.1:10023/g' /etc/postfix/main.cf"
+  _run_in_container bash -c "sed -ie 's/permit_sasl_authenticated.*policyd-spf,$//g' /etc/postfix/main.cf"
+  _run_in_container bash -c "sed -ie 's/reject_unauth_pipelining.*reject_unknown_recipient_domain,$//g' /etc/postfix/main.cf"
+  _run_in_container bash -c "sed -ie 's/reject_rbl_client.*inet:127\.0\.0\.1:10023$//g' /etc/postfix/main.cf"
+  _run_in_container bash -c "sed -ie 's/smtpd_recipient_restrictions =/smtpd_recipient_restrictions = check_policy_service inet:127.0.0.1:10023/g' /etc/postfix/main.cf"
+  _run_in_container postfix reload
 
-  run docker exec mail_with_postgrey /bin/sh -c "/etc/init.d/postfix reload"
-  run docker exec mail_with_postgrey /bin/sh -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/postgrey.txt"
+  _run_in_container bash -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/postgrey.txt"
   sleep 5 #ensure that the information has been written into the log
-  run docker exec mail_with_postgrey /bin/bash -c "grep -i 'action=greylist.*user@external\.tld' /var/log/mail/mail.log | wc -l"
+  _run_in_container bash -c "grep -i 'action=greylist.*user@external\.tld' /var/log/mail/mail.log | wc -l"
   assert_success
   assert_output 1
 }
 
-@test "checking postgrey: there should be a log entry about the retried and passed e-mail user@external.tld in /var/log/mail/mail.log" {
+@test "${TEST_NAME_PREFIX} there should be a log entry about the retried and passed e-mail user@external.tld in /var/log/mail/mail.log" {
   sleep 20 #wait 20 seconds so that postgrey would accept the message
-  run docker exec mail_with_postgrey /bin/sh -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/postgrey.txt"
+  _run_in_container bash -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/postgrey.txt"
   sleep 8
 
-  run docker exec mail_with_postgrey /bin/sh -c "grep -i 'action=pass, reason=triplet found.*user@external\.tld' /var/log/mail/mail.log | wc -l"
+  _run_in_container bash -c "grep -i 'action=pass, reason=triplet found.*user@external\.tld' /var/log/mail/mail.log | wc -l"
   assert_success
   assert_output 1
 }
 
-@test "checking postgrey: there should be a log entry about the whitelisted and passed e-mail user@whitelist.tld in /var/log/mail/mail.log" {
-  run docker exec mail_with_postgrey /bin/sh -c "nc -w 8 0.0.0.0 10023 < /tmp/docker-mailserver-test/nc_templates/postgrey_whitelist.txt"
-  run docker exec mail_with_postgrey /bin/sh -c "grep -i 'action=pass, reason=client whitelist' /var/log/mail/mail.log | wc -l"
+@test "${TEST_NAME_PREFIX} there should be a log entry about the whitelisted and passed e-mail user@whitelist.tld in /var/log/mail/mail.log" {
+  _run_in_container bash -c "nc -w 8 0.0.0.0 10023 < /tmp/docker-mailserver-test/nc_templates/postgrey_whitelist.txt"
+  _run_in_container bash -c "grep -i 'action=pass, reason=client whitelist' /var/log/mail/mail.log | wc -l"
   assert_success
   assert_output 1
 }
 
-@test "checking postgrey: there should be a log entry about the whitelisted local and passed e-mail user@whitelistlocal.tld in /var/log/mail/mail.log" {
-  run docker exec mail_with_postgrey /bin/sh -c "nc -w 8 0.0.0.0 10023 < /tmp/docker-mailserver-test/nc_templates/postgrey_whitelist_local.txt"
-  run docker exec mail_with_postgrey /bin/sh -c "grep -i 'action=pass, reason=client whitelist' /var/log/mail/mail.log | wc -l"
+@test "${TEST_NAME_PREFIX} there should be a log entry about the whitelisted local and passed e-mail user@whitelistlocal.tld in /var/log/mail/mail.log" {
+  _run_in_container bash -c "nc -w 8 0.0.0.0 10023 < /tmp/docker-mailserver-test/nc_templates/postgrey_whitelist_local.txt"
+  _run_in_container bash -c "grep -i 'action=pass, reason=client whitelist' /var/log/mail/mail.log | wc -l"
   assert_success
   assert_output 1
 }
 
-@test "checking postgrey: there should be a log entry about the whitelisted recipient user2@otherdomain.tld in /var/log/mail/mail.log" {
-  run docker exec mail_with_postgrey /bin/sh -c "nc -w 8 0.0.0.0 10023 < /tmp/docker-mailserver-test/nc_templates/postgrey_whitelist_recipients.txt"
-  run docker exec mail_with_postgrey /bin/sh -c "grep -i 'action=pass, reason=recipient whitelist' /var/log/mail/mail.log | wc -l"
+@test "${TEST_NAME_PREFIX} there should be a log entry about the whitelisted recipient user2@otherdomain.tld in /var/log/mail/mail.log" {
+  _run_in_container bash -c "nc -w 8 0.0.0.0 10023 < /tmp/docker-mailserver-test/nc_templates/postgrey_whitelist_recipients.txt"
+  _run_in_container bash -c "grep -i 'action=pass, reason=recipient whitelist' /var/log/mail/mail.log | wc -l"
   assert_success
   assert_output 1
 }
diff --git a/test/tests/parallel/set1/spam_virus/postscreen.bats b/test/tests/parallel/set1/spam_virus/postscreen.bats
index aa2f958a..e44c5bb1 100644
--- a/test/tests/parallel/set1/spam_virus/postscreen.bats
+++ b/test/tests/parallel/set1/spam_virus/postscreen.bats
@@ -1,44 +1,46 @@
-load "${REPOSITORY_ROOT}/test/test_helper/common"
+load "${REPOSITORY_ROOT}/test/helper/setup"
+load "${REPOSITORY_ROOT}/test/helper/common"
 
-setup() {
-  # Getting mail container IP
-  MAIL_POSTSCREEN_IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' mail_postscreen)
+TEST_NAME_PREFIX='Postscreen:'
+CONTAINER1_NAME='dms-test_postscreen_enforce'
+CONTAINER2_NAME='dms-test_postscreen_sender'
+
+function setup() {
+  MAIL_POSTSCREEN_IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' "${CONTAINER1_NAME}")
 }
 
-setup_file() {
-  local PRIVATE_CONFIG
-  PRIVATE_CONFIG=$(duplicate_config_for_container .)
+function setup_file() {
+  local CONTAINER_NAME=${CONTAINER1_NAME}
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env POSTSCREEN_ACTION=enforce
+    --cap-add=NET_ADMIN
+  )
+  init_with_defaults
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
+  wait_for_smtp_port_in_container "${CONTAINER_NAME}"
 
-  docker run -d --name mail_postscreen \
-    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
-    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
-    -e POSTSCREEN_ACTION=enforce \
-    --cap-add=NET_ADMIN \
-    -h mail.my-domain.com -t "${NAME}"
-
-  docker run --name mail_postscreen_sender \
-    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
-    -d "${NAME}" \
-    tail -f /var/log/faillog
-
-  wait_for_smtp_port_in_container mail_postscreen
+  local CONTAINER_NAME=${CONTAINER2_NAME}
+  init_with_defaults
+  common_container_setup
+  wait_for_smtp_port_in_container "${CONTAINER_NAME}"
 }
 
-teardown_file() {
-  docker rm -f mail_postscreen mail_postscreen_sender
+function teardown_file() {
+  docker rm -f "${CONTAINER1_NAME}" "${CONTAINER2_NAME}"
 }
 
-@test "checking postscreen: talk too fast" {
-  docker exec mail_postscreen_sender /bin/sh -c "nc ${MAIL_POSTSCREEN_IP} 25 < /tmp/docker-mailserver-test/auth/smtp-auth-login.txt"
+@test "${TEST_NAME_PREFIX} talk too fast" {
+  run docker exec "${CONTAINER2_NAME}" /bin/sh -c "nc ${MAIL_POSTSCREEN_IP} 25 < /tmp/docker-mailserver-test/auth/smtp-auth-login.txt"
+  assert_success
 
-  repeat_until_success_or_timeout 10 run docker exec mail_postscreen grep 'COMMAND PIPELINING' /var/log/mail/mail.log
+  repeat_until_success_or_timeout 10 run docker exec "${CONTAINER1_NAME}" grep 'COMMAND PIPELINING' /var/log/mail/mail.log
   assert_success
 }
 
-@test "checking postscreen: positive test (respecting postscreen_greet_wait time and talking in turn)" {
+@test "${TEST_NAME_PREFIX} positive test (respecting postscreen_greet_wait time and talking in turn)" {
   for _ in {1,2}; do
     # shellcheck disable=SC1004
-    docker exec mail_postscreen_sender /bin/bash -c \
+    docker exec "${CONTAINER2_NAME}" /bin/bash -c \
     'exec 3<>/dev/tcp/'"${MAIL_POSTSCREEN_IP}"'/25 && \
     while IFS= read -r cmd; do \
       head -1 <&3; \
@@ -47,6 +49,6 @@ teardown_file() {
     done < "/tmp/docker-mailserver-test/auth/smtp-auth-login.txt"'
   done
 
-  repeat_until_success_or_timeout 10 run docker exec mail_postscreen grep 'PASS NEW ' /var/log/mail/mail.log
+  repeat_until_success_or_timeout 10 run docker exec "${CONTAINER1_NAME}" grep 'PASS NEW ' /var/log/mail/mail.log
   assert_success
 }
diff --git a/test/tests/parallel/set1/spam_virus/spam_bounced.bats b/test/tests/parallel/set1/spam_virus/spam_bounced.bats
index 321d2981..1931149e 100644
--- a/test/tests/parallel/set1/spam_virus/spam_bounced.bats
+++ b/test/tests/parallel/set1/spam_virus/spam_bounced.bats
@@ -1,8 +1,8 @@
 load "${REPOSITORY_ROOT}/test/helper/setup"
 load "${REPOSITORY_ROOT}/test/helper/common"
 
-TEST_NAME_PREFIX='spam (Amavis):'
-CONTAINER_NAME='dms-test-spam_bounced'
+TEST_NAME_PREFIX='Spam bounced:'
+CONTAINER_NAME='dms-test_spam-bounced'
 
 function setup_file() {
   init_with_defaults
diff --git a/test/tests/parallel/set1/spam_virus/spam_junk_folder.bats b/test/tests/parallel/set1/spam_virus/spam_junk_folder.bats
index e335d06f..b69f774d 100644
--- a/test/tests/parallel/set1/spam_virus/spam_junk_folder.bats
+++ b/test/tests/parallel/set1/spam_virus/spam_junk_folder.bats
@@ -1,67 +1,67 @@
-load "${REPOSITORY_ROOT}/test/test_helper/common"
+load "${REPOSITORY_ROOT}/test/helper/setup"
+load "${REPOSITORY_ROOT}/test/helper/common"
+
+TEST_NAME_PREFIX='Spam junk folder:'
+CONTAINER1_NAME='dms-test_spam-junk-folder_1'
+CONTAINER2_NAME='dms-test_spam-junk-folder_2'
+
+function teardown() { _default_teardown ; }
 
 # Test case
 # ---------
-# When SPAMASSASSIN_SPAM_TO_INBOX=1, spam messages must be delivered and eventually (MOVE_SPAM_TO_JUNK=1) moved to the Junk folder.
+# When SPAMASSASSIN_SPAM_TO_INBOX=1, spam messages must be delivered
+# and eventually (MOVE_SPAM_TO_JUNK=1) moved to the Junk folder.
 
-@test "checking amavis: spam message is delivered and moved to the Junk folder (MOVE_SPAM_TO_JUNK=1)" {
-  local PRIVATE_CONFIG
-  PRIVATE_CONFIG=$(duplicate_config_for_container . mail_spam_moved_junk)
-
-  docker run -d --name mail_spam_moved_junk \
-    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
-    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
-    -e ENABLE_SPAMASSASSIN=1 \
-    -e MOVE_SPAM_TO_JUNK=1 \
-    -e PERMIT_DOCKER=container \
-    -e SA_SPAM_SUBJECT="SPAM: " \
-    -e SPAMASSASSIN_SPAM_TO_INBOX=1 \
-    -h mail.my-domain.com -t "${NAME}"
-
-  teardown() { docker rm -f mail_spam_moved_junk; }
-
-  wait_for_smtp_port_in_container mail_spam_moved_junk
+@test "${TEST_NAME_PREFIX} (Amavis) spam message delivered & moved to Junk folder" {
+  export CONTAINER_NAME=${CONTAINER1_NAME}
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env ENABLE_AMAVIS=1
+    --env ENABLE_SPAMASSASSIN=1
+    --env MOVE_SPAM_TO_JUNK=1
+    --env PERMIT_DOCKER=container
+    --env SA_SPAM_SUBJECT="SPAM: "
+    --env SPAMASSASSIN_SPAM_TO_INBOX=1
+  )
+  init_with_defaults
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
+  wait_for_smtp_port_in_container "${CONTAINER_NAME}"
 
   # send a spam message
-  run docker exec mail_spam_moved_junk /bin/sh -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/amavis-spam.txt"
+  _run_in_container bash -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/amavis-spam.txt"
   assert_success
 
   # message will be added to a queue with varying delay until amavis receives it
-  run repeat_until_success_or_timeout 60 sh -c "docker logs mail_spam_moved_junk | grep 'Passed SPAM {RelayedTaggedInbound,Quarantined}'"
+  run repeat_until_success_or_timeout 60 bash -c "docker logs ${CONTAINER_NAME} | grep 'Passed SPAM {RelayedTaggedInbound,Quarantined}'"
   assert_success
 
   # spam moved to Junk folder
-  run repeat_until_success_or_timeout 20 sh -c "docker exec mail_spam_moved_junk sh -c 'grep \"Subject: SPAM: \" /var/mail/localhost.localdomain/user1/.Junk/new/ -R'"
+  run repeat_until_success_or_timeout 20 bash -c "docker exec ${CONTAINER_NAME} sh -c 'grep \"Subject: SPAM: \" /var/mail/localhost.localdomain/user1/.Junk/new/ -R'"
   assert_success
 }
 
-@test "checking amavis: spam message is delivered to INBOX (MOVE_SPAM_TO_JUNK=0)" {
-  local PRIVATE_CONFIG
-  PRIVATE_CONFIG=$(duplicate_config_for_container . mail_spam_moved_new)
-
-  docker run -d --name mail_spam_moved_new \
-    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
-    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
-    -e ENABLE_SPAMASSASSIN=1 \
-    -e MOVE_SPAM_TO_JUNK=0 \
-    -e PERMIT_DOCKER=container \
-    -e SA_SPAM_SUBJECT="SPAM: " \
-    -e SPAMASSASSIN_SPAM_TO_INBOX=1 \
-    -h mail.my-domain.com -t "${NAME}"
-
-  teardown() { docker rm -f mail_spam_moved_new; }
-
-  wait_for_smtp_port_in_container mail_spam_moved_new
+@test "${TEST_NAME_PREFIX} (Amavis) spam message delivered to INBOX" {
+  export CONTAINER_NAME=${CONTAINER2_NAME}
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env ENABLE_AMAVIS=1
+    --env ENABLE_SPAMASSASSIN=1
+    --env MOVE_SPAM_TO_JUNK=0
+    --env PERMIT_DOCKER=container
+    --env SA_SPAM_SUBJECT="SPAM: "
+    --env SPAMASSASSIN_SPAM_TO_INBOX=1
+  )
+  init_with_defaults
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
+  wait_for_smtp_port_in_container "${CONTAINER_NAME}"
 
   # send a spam message
-  run docker exec mail_spam_moved_new /bin/sh -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/amavis-spam.txt"
+  _run_in_container /bin/bash -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/amavis-spam.txt"
   assert_success
 
   # message will be added to a queue with varying delay until amavis receives it
-  run repeat_until_success_or_timeout 60 sh -c "docker logs mail_spam_moved_new | grep 'Passed SPAM {RelayedTaggedInbound,Quarantined}'"
+  run repeat_until_success_or_timeout 60 bash -c "docker logs ${CONTAINER_NAME} | grep 'Passed SPAM {RelayedTaggedInbound,Quarantined}'"
   assert_success
 
   # spam moved to INBOX
-  run repeat_until_success_or_timeout 20 sh -c "docker exec mail_spam_moved_new sh -c 'grep \"Subject: SPAM: \" /var/mail/localhost.localdomain/user1/new/ -R'"
+  run repeat_until_success_or_timeout 20 bash -c "docker exec ${CONTAINER_NAME} sh -c 'grep \"Subject: SPAM: \" /var/mail/localhost.localdomain/user1/new/ -R'"
   assert_success
 }
diff --git a/test/tests/parallel/set1/spam_virus/undef_spam_subject.bats b/test/tests/parallel/set1/spam_virus/undef_spam_subject.bats
index d5836dd3..7534e8d5 100644
--- a/test/tests/parallel/set1/spam_virus/undef_spam_subject.bats
+++ b/test/tests/parallel/set1/spam_virus/undef_spam_subject.bats
@@ -1,64 +1,61 @@
-load "${REPOSITORY_ROOT}/test/test_helper/common"
+load "${REPOSITORY_ROOT}/test/helper/setup"
+load "${REPOSITORY_ROOT}/test/helper/common"
 
-function setup() {
-  local PRIVATE_CONFIG
+TEST_NAME_PREFIX='Undefined spam subject:'
 
-  PRIVATE_CONFIG=$(duplicate_config_for_container .)
-  docker run -d --name mail_undef_spam_subject \
-    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
-    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
-    -e ENABLE_SPAMASSASSIN=1 \
-    -e SA_SPAM_SUBJECT="undef" \
-    --hostname mail.my-domain.com \
-    --tty \
-    "${NAME}"
+CONTAINER1_NAME='dms-test_spam-undef-subject_1'
+CONTAINER2_NAME='dms-test_spam-undef-subject_2'
+CONTAINER_NAME=${CONTAINER2_NAME}
 
-  CONTAINER='mail_undef_spam_subject_2'
-  PRIVATE_CONFIG=$(duplicate_config_for_container . "${CONTAINER}")
-  docker run -d \
-    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
-    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
-    -v "$(pwd)/test/onedir":/var/mail-state \
-    -e ENABLE_CLAMAV=1 \
-    -e SPOOF_PROTECTION=1 \
-    -e ENABLE_SPAMASSASSIN=1 \
-    -e REPORT_RECIPIENT=user1@localhost.localdomain \
-    -e REPORT_SENDER=report1@mail.my-domain.com \
-    -e SA_TAG=-5.0 \
-    -e SA_TAG2=2.0 \
-    -e SA_KILL=3.0 \
-    -e SA_SPAM_SUBJECT="SPAM: " \
-    -e VIRUSMAILS_DELETE_DELAY=7 \
-    -e ENABLE_SRS=1 \
-    -e ENABLE_MANAGESIEVE=1 \
-    -e PERMIT_DOCKER=host \
-    --name "${CONTAINER}" \
-    --hostname mail.my-domain.com \
-    --tty \
-    --ulimit "nofile=$(ulimit -Sn):$(ulimit -Hn)" \
-    "${NAME}"
+function setup_file() {
+  local CONTAINER_NAME=${CONTAINER1_NAME}
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env ENABLE_AMAVIS=1
+    --env ENABLE_SPAMASSASSIN=1
+    --env SA_SPAM_SUBJECT='undef'
+  )
+  init_with_defaults
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
 
-  wait_for_finished_setup_in_container mail_undef_spam_subject
-  wait_for_finished_setup_in_container "${CONTAINER}"
+  # ulimit required for `ENABLE_SRS=1`
+  local CONTAINER_NAME=${CONTAINER2_NAME}
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env ENABLE_CLAMAV=1
+    --env SPOOF_PROTECTION=1
+    --env ENABLE_SPAMASSASSIN=1
+    --env REPORT_RECIPIENT=user1@localhost.localdomain
+    --env REPORT_SENDER=report1@mail.my-domain.com
+    --env SA_TAG=-5.0
+    --env SA_TAG2=2.0
+    --env SA_KILL=3.0
+    --env SA_SPAM_SUBJECT="SPAM: "
+    --env VIRUSMAILS_DELETE_DELAY=7
+    --env ENABLE_SRS=1
+    --env ENABLE_MANAGESIEVE=1
+    --env PERMIT_DOCKER=host
+    --ulimit "nofile=$(ulimit -Sn):$(ulimit -Hn)"
+  )
+  init_with_defaults
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
 }
 
-function teardown() {
-  docker rm -f mail_undef_spam_subject "${CONTAINER}"
+function teardown_file() {
+  docker rm -f "${CONTAINER1_NAME}" "${CONTAINER2_NAME}"
 }
 
-@test "checking spamassassin: docker env variables are set correctly (custom)" {
-  run docker exec "${CONTAINER}" /bin/sh -c "grep '\$sa_tag_level_deflt' /etc/amavis/conf.d/20-debian_defaults | grep '= -5.0'"
+@test "${TEST_NAME_PREFIX} Docker env variables are set correctly (custom)" {
+  _run_in_container bash -c "grep '\$sa_tag_level_deflt' /etc/amavis/conf.d/20-debian_defaults | grep '= -5.0'"
   assert_success
 
-  run docker exec "${CONTAINER}" /bin/sh -c "grep '\$sa_tag2_level_deflt' /etc/amavis/conf.d/20-debian_defaults | grep '= 2.0'"
+  _run_in_container bash -c "grep '\$sa_tag2_level_deflt' /etc/amavis/conf.d/20-debian_defaults | grep '= 2.0'"
   assert_success
 
-  run docker exec "${CONTAINER}" /bin/sh -c "grep '\$sa_kill_level_deflt' /etc/amavis/conf.d/20-debian_defaults | grep '= 3.0'"
+  _run_in_container bash -c "grep '\$sa_kill_level_deflt' /etc/amavis/conf.d/20-debian_defaults | grep '= 3.0'"
   assert_success
 
-  run docker exec "${CONTAINER}" /bin/sh -c "grep '\$sa_spam_subject_tag' /etc/amavis/conf.d/20-debian_defaults | grep '= .SPAM: .'"
+  _run_in_container bash -c "grep '\$sa_spam_subject_tag' /etc/amavis/conf.d/20-debian_defaults | grep '= .SPAM: .'"
   assert_success
 
-  run docker exec mail_undef_spam_subject /bin/sh -c "grep '\$sa_spam_subject_tag' /etc/amavis/conf.d/20-debian_defaults | grep '= undef'"
+  run docker exec "${CONTAINER1_NAME}" bash -c "grep '\$sa_spam_subject_tag' /etc/amavis/conf.d/20-debian_defaults | grep '= undef'"
   assert_success
 }
diff --git a/test/tests/parallel/set2/template.bats b/test/tests/parallel/set2/template.bats
index eb19cb58..7415b43a 100644
--- a/test/tests/parallel/set2/template.bats
+++ b/test/tests/parallel/set2/template.bats
@@ -6,7 +6,7 @@ load "${REPOSITORY_ROOT}/test/helper/common"
 # ?   to identify the test easily
 TEST_NAME_PREFIX='template:'
 # ?   must be unique
-CONTAINER_NAME='dms-test-template'
+CONTAINER_NAME='dms-test_template'
 
 # ? test setup
 
diff --git a/test/tests/parallel/set2/tls/tls_cipherlists.bats b/test/tests/parallel/set2/tls/tls_cipherlists.bats
index ffe6e643..745cc9ea 100644
--- a/test/tests/parallel/set2/tls/tls_cipherlists.bats
+++ b/test/tests/parallel/set2/tls/tls_cipherlists.bats
@@ -1,81 +1,128 @@
-#!/usr/bin/env bats
-load "${REPOSITORY_ROOT}/test/test_helper/common"
-# Globals ${BATS_TMPDIR} and ${NAME}
-# `${NAME}` defaults to `mailserver-testing:ci`
+load "${REPOSITORY_ROOT}/test/helper/setup"
+load "${REPOSITORY_ROOT}/test/helper/common"
 
-function teardown() {
-  docker rm -f tls_test_cipherlists
-}
+TEST_NAME_PREFIX='[Security] TLS (cipher lists):'
+CONTAINER_PREFIX='dms-test_tls-cipherlists'
+
+# NOTE: Tests cases here cannot be run concurrently:
+# - The `testssl.txt` file configures `testssl.sh` to connect to `example.test` (TEST_DOMAIN)
+#   and this is set as a network alias to the DMS container being tested.
+# - If multiple containers are active with this alias, the connection is not deterministic and will result
+#   in comparing the wrong results for a given variant.
 
 function setup_file() {
-  export DOMAIN="example.test"
-  export NETWORK="test-network"
+  export TEST_DOMAIN='example.test'
+  export TEST_FQDN="mail.${TEST_DOMAIN}"
+  export TEST_NETWORK='test-network'
 
-  # Shared config for TLS testing (read-only)
+  # Contains various certs for testing TLS support (read-only):
   export TLS_CONFIG_VOLUME
-  TLS_CONFIG_VOLUME="$(pwd)/test/test-files/ssl/${DOMAIN}/:/config/ssl/:ro"
-  # `${BATS_TMPDIR}` maps to `/tmp`
-  export TLS_RESULTS_DIR="${BATS_TMPDIR}/results"
+  TLS_CONFIG_VOLUME="${PWD}/test/test-files/ssl/${TEST_DOMAIN}/:/config/ssl/:ro"
 
-  # NOTE: If the network already exists, test will fail to start.
-  docker network create "${NETWORK}"
-
-  # Copies all of `./test/config/` to specific directory for testing
-  # `${PRIVATE_CONFIG}` becomes `$(pwd)/test/duplicate_configs/<bats test filename>`
-  export PRIVATE_CONFIG
-  PRIVATE_CONFIG=$(duplicate_config_for_container .)
+  # Used for connecting testssl and DMS containers via network name `TEST_DOMAIN`:
+  # NOTE: If the network already exists, the test will fail to start
+  docker network create "${TEST_NETWORK}"
 
   # Pull `testssl.sh` image in advance to avoid it interfering with the `run` captured output.
   # Only interferes (potential test failure) with `assert_output` not `assert_success`?
   docker pull drwetter/testssl.sh:3.1dev
+
+  # Only used in `should_support_expected_cipherlists()` to set a storage location for `testssl.sh` JSON output:
+  # `${BATS_TMPDIR}` maps to `/tmp`: https://bats-core.readthedocs.io/en/v1.8.2/writing-tests.html#special-variables
+  export TLS_RESULTS_DIR="${BATS_TMPDIR}/results"
 }
 
 function teardown_file() {
-  docker network rm "${NETWORK}"
+  docker network rm "${TEST_NETWORK}"
 }
 
-@test "checking tls: cipher list - rsa intermediate" {
-  check_ports 'rsa' 'intermediate'
+function teardown() { _default_teardown ; }
+
+@test "${TEST_NAME_PREFIX} 'TLS_LEVEL=intermediate' + RSA" {
+  configure_and_run_dms_container 'intermediate' 'rsa'
+  should_support_expected_cipherlists
 }
 
-@test "checking tls: cipher list - rsa modern" {
-  check_ports 'rsa' 'modern'
+@test "${TEST_NAME_PREFIX} 'TLS_LEVEL=intermediate' + ECDSA" {
+  configure_and_run_dms_container 'intermediate' 'ecdsa'
+  should_support_expected_cipherlists
 }
 
-@test "checking tls: cipher list - ecdsa intermediate" {
-  check_ports 'ecdsa' 'intermediate'
+# Only ECDSA with an RSA fallback is tested.
+# There isn't a situation where RSA with an ECDSA fallback would make sense.
+@test "${TEST_NAME_PREFIX} 'TLS_LEVEL=intermediate' + ECDSA with RSA fallback" {
+  configure_and_run_dms_container 'intermediate' 'ecdsa' 'rsa'
+  should_support_expected_cipherlists
 }
 
-@test "checking tls: cipher list - ecdsa modern" {
-  check_ports 'ecdsa' 'modern'
+@test "${TEST_NAME_PREFIX} 'TLS_LEVEL=modern' + RSA" {
+  configure_and_run_dms_container 'modern' 'rsa'
+  should_support_expected_cipherlists
 }
 
-
-# Only ECDSA with RSA fallback is tested.
-# There isn't a situation where RSA with ECDSA fallback would make sense.
-@test "checking tls: cipher list - ecdsa intermediate, with rsa fallback" {
-  check_ports 'ecdsa' 'intermediate' 'rsa'
+@test "${TEST_NAME_PREFIX} 'TLS_LEVEL=modern' + ECDSA" {
+  configure_and_run_dms_container 'modern' 'ecdsa'
+  should_support_expected_cipherlists
 }
 
-@test "checking tls: cipher list - ecdsa modern, with rsa fallback" {
-  check_ports 'ecdsa' 'modern' 'rsa'
+@test "${TEST_NAME_PREFIX} 'TLS_LEVEL=modern' + ECDSA with RSA fallback" {
+  configure_and_run_dms_container 'modern' 'ecdsa' 'rsa'
+  should_support_expected_cipherlists
 }
 
-function check_ports() {
-  local KEY_TYPE=$1
-  local TLS_LEVEL=$2
+function configure_and_run_dms_container() {
+  local TLS_LEVEL=$1
+  local KEY_TYPE=$2
   local ALT_KEY_TYPE=$3 # Optional parameter
 
-  local KEY_TYPE_LABEL="${KEY_TYPE}"
-  # This is just to add a `_` delimiter between the two key types for readability
+  export TEST_VARIANT="${TLS_LEVEL}-${KEY_TYPE}"
   if [[ -n ${ALT_KEY_TYPE} ]]
   then
-    KEY_TYPE_LABEL="${KEY_TYPE}_${ALT_KEY_TYPE}"
+    TEST_VARIANT+="-${ALT_KEY_TYPE}"
   fi
-  local RESULTS_PATH="${KEY_TYPE_LABEL}/${TLS_LEVEL}"
 
-  collect_cipherlist_data
+  export CONTAINER_NAME="${CONTAINER_PREFIX}_${TEST_VARIANT}"
+  # The initial set of args is static across test cases:
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --volume "${TLS_CONFIG_VOLUME}"
+    --network "${TEST_NETWORK}"
+    --network-alias "${TEST_DOMAIN}"
+    --env ENABLE_POP3=1
+    --env SSL_TYPE="manual"
+  )
 
+  # The remaining args are dependent upon test case vars:
+  CUSTOM_SETUP_ARGUMENTS+=(
+    --env TLS_LEVEL="${TLS_LEVEL}"
+    --env SSL_CERT_PATH="/config/ssl/cert.${KEY_TYPE}.pem"
+    --env SSL_KEY_PATH="/config/ssl/key.${KEY_TYPE}.pem"
+  )
+
+  if [[ -n ${ALT_KEY_TYPE} ]]
+  then
+    CUSTOM_SETUP_ARGUMENTS+=(
+      --env SSL_ALT_CERT_PATH="/config/ssl/cert.${ALT_KEY_TYPE}.pem"
+      --env SSL_ALT_KEY_PATH="/config/ssl/key.${ALT_KEY_TYPE}.pem"
+    )
+  fi
+
+  init_with_defaults
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
+  wait_for_smtp_port_in_container "${CONTAINER_NAME}"
+}
+
+function should_support_expected_cipherlists() {
+  # Make a directory with test user ownership. Avoids Docker creating this with root ownership.
+  # TODO: Can switch to filename prefix for JSON output when this is resolved: https://github.com/drwetter/testssl.sh/issues/1845
+  local RESULTS_PATH="${TLS_RESULTS_DIR}/${TEST_VARIANT}"
+  mkdir -p "${RESULTS_PATH}"
+
+  collect_cipherlists
+  verify_cipherlists
+}
+
+# Verify that the collected results match our expected cipherlists:
+function verify_cipherlists() {
   # SMTP: Opportunistic STARTTLS Explicit(25)
   # Needs to test against cipher lists specific to Port 25 ('_p25' parameter)
   check_cipherlists "${RESULTS_PATH}/port_25.json" '_p25'
@@ -93,82 +140,56 @@ function check_ports() {
   check_cipherlists "${RESULTS_PATH}/port_995.json"
 }
 
-function collect_cipherlist_data() {
-  local ALT_CERT=()
-  local ALT_KEY=()
-
-  if [[ -n ${ALT_KEY_TYPE} ]]
-  then
-    ALT_CERT=(--env SSL_ALT_CERT_PATH="/config/ssl/cert.${ALT_KEY_TYPE}.pem")
-    ALT_KEY=(--env SSL_ALT_KEY_PATH="/config/ssl/key.${ALT_KEY_TYPE}.pem")
-  fi
-
-  run docker run -d --name tls_test_cipherlists \
-    --volume "${PRIVATE_CONFIG}/:/tmp/docker-mailserver/" \
-    --volume "${TLS_CONFIG_VOLUME}" \
-    --env ENABLE_POP3=1 \
-    --env SSL_TYPE="manual" \
-    --env SSL_CERT_PATH="/config/ssl/cert.${KEY_TYPE}.pem" \
-    --env SSL_KEY_PATH="/config/ssl/key.${KEY_TYPE}.pem" \
-    "${ALT_CERT[@]}" \
-    "${ALT_KEY[@]}" \
-    --env TLS_LEVEL="${TLS_LEVEL}" \
-    --network "${NETWORK}" \
-    --network-alias "${DOMAIN}" \
-    --hostname "mail.${DOMAIN}" \
-    --tty \
-    "${NAME}" # Image name
-
-  assert_success
-
-  wait_for_tcp_port_in_container 25 tls_test_cipherlists
+# Using `testssl.sh` we can test each port to collect a list of supported cipher suites (ordered):
+function collect_cipherlists() {
   # NOTE: An rDNS query for the container IP will resolve to `<container name>.<network name>.`
 
-  # Make directory with test user ownership. Avoids Docker creating with root ownership.
-  # TODO: Can switch to filename prefix for JSON output when this is resolved: https://github.com/drwetter/testssl.sh/issues/1845
-  mkdir -p "${TLS_RESULTS_DIR}/${RESULTS_PATH}"
-
   # For non-CI test runs, instead of removing prior test files after this test suite completes,
   # they're retained and overwritten by future test runs instead. Useful for inspection.
   # `--preference` reduces the test scope to the cipher suites reported as supported by the server. Completes in ~35% of the time.
-  local TESTSSL_CMD=(--quiet --file "/config/ssl/testssl.txt" --mode parallel --overwrite --preference)
+  local TESTSSL_CMD=(
+    --quiet
+    --file "/config/ssl/testssl.txt"
+    --mode parallel
+    --overwrite
+    --preference
+  )
   # NOTE: Batch testing ports via `--file` doesn't properly bubble up failure.
   # If the failure for a test is misleading consider testing a single port with:
-  # local TESTSSL_CMD=(--quiet --jsonfile-pretty "${RESULTS_PATH}/port_${PORT}.json" --starttls smtp "${DOMAIN}:${PORT}")
+  # local TESTSSL_CMD=(--quiet --jsonfile-pretty "/output/port_${PORT}.json" --starttls smtp "${TEST_DOMAIN}:${PORT}")
   # TODO: Can use `jq` to check for failure when this is resolved: https://github.com/drwetter/testssl.sh/issues/1844
 
   # `--user "<uid>:<gid>"` is a workaround: Avoids `permission denied` write errors for json output, uses `id` to match user uid & gid.
   run docker run --rm \
     --user "$(id -u):$(id -g)" \
-    --network "${NETWORK}" \
+    --network "${TEST_NETWORK}" \
     --volume "${TLS_CONFIG_VOLUME}" \
-    --volume "${TLS_RESULTS_DIR}/${RESULTS_PATH}/:/output" \
+    --volume "${RESULTS_PATH}:/output" \
     --workdir "/output" \
     drwetter/testssl.sh:3.1dev "${TESTSSL_CMD[@]}"
 
   assert_success
 }
 
+# Compares the expected cipher lists against logged test results from `testssl.sh`
+function check_cipherlists() {
+  local RESULTS_FILEPATH=$1
+  local p25=$2 # optional suffix
+
+  compare_cipherlist "cipherorder_TLSv1_2" "$(get_cipherlist "TLSv1_2${p25}")"
+  compare_cipherlist "cipherorder_TLSv1_3" "$(get_cipherlist 'TLSv1_3')"
+}
+
 # Use `jq` to extract a specific cipher list from the target`testssl.sh` results json output file
 function compare_cipherlist() {
   local TARGET_CIPHERLIST=$1
-  local RESULTS_FILE=$2
-  local EXPECTED_CIPHERLIST=$3
+  local EXPECTED_CIPHERLIST=$2
 
-  run jq '.scanResult[0].serverPreferences[] | select(.id=="'"${TARGET_CIPHERLIST}"'") | .finding' "${TLS_RESULTS_DIR}/${RESULTS_FILE}"
+  run jq '.scanResult[0].serverPreferences[] | select(.id=="'"${TARGET_CIPHERLIST}"'") | .finding' "${RESULTS_FILEPATH}"
   assert_success
   assert_output "${EXPECTED_CIPHERLIST}"
 }
 
-# Compares the expected cipher lists against logged test results from `testssl.sh`
-function check_cipherlists() {
-  local RESULTS_FILE=$1
-  local p25=$2 # optional suffix
-
-  compare_cipherlist "cipherorder_TLSv1_2" "${RESULTS_FILE}" "$(get_cipherlist "TLSv1_2${p25}")"
-  compare_cipherlist "cipherorder_TLSv1_3" "${RESULTS_FILE}" "$(get_cipherlist 'TLSv1_3')"
-}
-
 # Expected cipher lists. Should match `TLS_LEVEL` cipher lists set in `scripts/helpers/ssl.sh`.
 # Excluding Port 25 which uses defaults from Postfix after applying `smtpd_tls_exclude_ciphers` rules.
 # NOTE: If a test fails, look at the `check_ports` params, then update the corresponding associative key's value
@@ -185,34 +206,33 @@ function get_cipherlist() {
     # Associative array for easy querying of required cipher list
     declare -A CIPHER_LIST
 
-    CIPHER_LIST["rsa_intermediate_TLSv1_2"]='"ECDHE-RSA-CHACHA20-POLY1305 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-AES128-SHA256 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES128-SHA256 DHE-RSA-AES256-SHA256"'
-    CIPHER_LIST["rsa_modern_TLSv1_2"]='"ECDHE-RSA-AES128-GCM-SHA256 ECDHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384"'
+    # RSA:
+    CIPHER_LIST["intermediate-rsa_TLSv1_2"]='"ECDHE-RSA-CHACHA20-POLY1305 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-AES128-SHA256 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES128-SHA256 DHE-RSA-AES256-SHA256"'
+    CIPHER_LIST["modern-rsa_TLSv1_2"]='"ECDHE-RSA-AES128-GCM-SHA256 ECDHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384"'
 
     # ECDSA:
-    CIPHER_LIST["ecdsa_intermediate_TLSv1_2"]='"ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-SHA256 ECDHE-ECDSA-AES256-SHA384"'
-    CIPHER_LIST["ecdsa_modern_TLSv1_2"]='"ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305"'
+    CIPHER_LIST["intermediate-ecdsa_TLSv1_2"]='"ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-SHA256 ECDHE-ECDSA-AES256-SHA384"'
+    CIPHER_LIST["modern-ecdsa_TLSv1_2"]='"ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305"'
 
     # ECDSA + RSA fallback, dual cert support:
-    CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_2"]='"ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-SHA256 ECDHE-RSA-AES128-SHA256 ECDHE-RSA-AES256-SHA384 ECDHE-ECDSA-AES256-SHA384 DHE-RSA-AES128-SHA256 DHE-RSA-AES256-SHA256"'
-    CIPHER_LIST["ecdsa_rsa_modern_TLSv1_2"]='"ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384"'
+    CIPHER_LIST["intermediate-ecdsa-rsa_TLSv1_2"]='"ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-SHA256 ECDHE-RSA-AES128-SHA256 ECDHE-RSA-AES256-SHA384 ECDHE-ECDSA-AES256-SHA384 DHE-RSA-AES128-SHA256 DHE-RSA-AES256-SHA256"'
+    CIPHER_LIST["modern-ecdsa-rsa_TLSv1_2"]='"ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384"'
 
 
-    # Port 25
-    # TLSv1_2 has different server order and also includes ARIA, CCM, DHE+CHACHA20-POLY1305 cipher suites:
-    CIPHER_LIST["rsa_intermediate_TLSv1_2_p25"]='"ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-CHACHA20-POLY1305 DHE-RSA-AES256-CCM8 DHE-RSA-AES256-CCM ECDHE-ARIA256-GCM-SHA384 DHE-RSA-ARIA256-GCM-SHA384 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES256-SHA256 ARIA256-GCM-SHA384 ECDHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-CCM8 DHE-RSA-AES128-CCM ECDHE-ARIA128-GCM-SHA256 DHE-RSA-ARIA128-GCM-SHA256 ECDHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA256 ARIA128-GCM-SHA256"'
-    # Port 25 is unaffected by `TLS_LEVEL` profiles, it has the same TLS v1.2 cipher list under both:
-    CIPHER_LIST["rsa_modern_TLSv1_2_p25"]=${CIPHER_LIST["rsa_intermediate_TLSv1_2_p25"]}
-
+    # Port 25 has a different server order, and also includes ARIA, CCM, DHE+CHACHA20-POLY1305 cipher suites:
+    # RSA (Port 25):
+    CIPHER_LIST["intermediate-rsa_TLSv1_2_p25"]='"ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-CHACHA20-POLY1305 DHE-RSA-AES256-CCM8 DHE-RSA-AES256-CCM ECDHE-ARIA256-GCM-SHA384 DHE-RSA-ARIA256-GCM-SHA384 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES256-SHA256 ARIA256-GCM-SHA384 ECDHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-CCM8 DHE-RSA-AES128-CCM ECDHE-ARIA128-GCM-SHA256 DHE-RSA-ARIA128-GCM-SHA256 ECDHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA256 ARIA128-GCM-SHA256"'
     # ECDSA (Port 25):
-    CIPHER_LIST["ecdsa_intermediate_TLSv1_2_p25"]='"ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES256-CCM8 ECDHE-ECDSA-AES256-CCM ECDHE-ECDSA-ARIA256-GCM-SHA384 ECDHE-ECDSA-AES256-SHA384 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES128-CCM8 ECDHE-ECDSA-AES128-CCM ECDHE-ECDSA-ARIA128-GCM-SHA256 ECDHE-ECDSA-AES128-SHA256"'
-    CIPHER_LIST["ecdsa_modern_TLSv1_2_p25"]=${CIPHER_LIST["ecdsa_intermediate_TLSv1_2_p25"]}
-
+    CIPHER_LIST["intermediate-ecdsa_TLSv1_2_p25"]='"ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES256-CCM8 ECDHE-ECDSA-AES256-CCM ECDHE-ECDSA-ARIA256-GCM-SHA384 ECDHE-ECDSA-AES256-SHA384 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES128-CCM8 ECDHE-ECDSA-AES128-CCM ECDHE-ECDSA-ARIA128-GCM-SHA256 ECDHE-ECDSA-AES128-SHA256"'
     # ECDSA + RSA fallback, dual cert support (Port 25):
-    CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_2_p25"]='"ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES256-CCM8 ECDHE-ECDSA-AES256-CCM DHE-RSA-AES256-CCM8 DHE-RSA-AES256-CCM ECDHE-ECDSA-ARIA256-GCM-SHA384 ECDHE-ARIA256-GCM-SHA384 DHE-RSA-ARIA256-GCM-SHA384 ECDHE-ECDSA-AES256-SHA384 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES256-SHA256 ARIA256-GCM-SHA384 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES128-CCM8 ECDHE-ECDSA-AES128-CCM DHE-RSA-AES128-CCM8 DHE-RSA-AES128-CCM ECDHE-ECDSA-ARIA128-GCM-SHA256 ECDHE-ARIA128-GCM-SHA256 DHE-RSA-ARIA128-GCM-SHA256 ECDHE-ECDSA-AES128-SHA256 ECDHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA256 ARIA128-GCM-SHA256"'
-    CIPHER_LIST["ecdsa_rsa_modern_TLSv1_2_p25"]=${CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_2_p25"]}
+    CIPHER_LIST["intermediate-ecdsa-rsa_TLSv1_2_p25"]='"ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES256-CCM8 ECDHE-ECDSA-AES256-CCM DHE-RSA-AES256-CCM8 DHE-RSA-AES256-CCM ECDHE-ECDSA-ARIA256-GCM-SHA384 ECDHE-ARIA256-GCM-SHA384 DHE-RSA-ARIA256-GCM-SHA384 ECDHE-ECDSA-AES256-SHA384 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES256-SHA256 ARIA256-GCM-SHA384 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES128-CCM8 ECDHE-ECDSA-AES128-CCM DHE-RSA-AES128-CCM8 DHE-RSA-AES128-CCM ECDHE-ECDSA-ARIA128-GCM-SHA256 ECDHE-ARIA128-GCM-SHA256 DHE-RSA-ARIA128-GCM-SHA256 ECDHE-ECDSA-AES128-SHA256 ECDHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA256 ARIA128-GCM-SHA256"'
 
+    # Port 25 is unaffected by `TLS_LEVEL` profiles, thus no difference for modern:
+    CIPHER_LIST["modern-rsa_TLSv1_2_p25"]=${CIPHER_LIST["intermediate-rsa_TLSv1_2_p25"]}
+    CIPHER_LIST["modern-ecdsa_TLSv1_2_p25"]=${CIPHER_LIST["intermediate-ecdsa_TLSv1_2_p25"]}
+    CIPHER_LIST["modern-ecdsa-rsa_TLSv1_2_p25"]=${CIPHER_LIST["intermediate-ecdsa-rsa_TLSv1_2_p25"]}
 
-    local TARGET_QUERY="${KEY_TYPE_LABEL}_${TLS_LEVEL}_${TLS_VERSION}"
+    local TARGET_QUERY="${TEST_VARIANT}_${TLS_VERSION}"
     echo "${CIPHER_LIST[${TARGET_QUERY}]}"
   fi
 }
diff --git a/test/tests/parallel/set2/tls/tls_letsencrypt.bats b/test/tests/parallel/set2/tls/tls_letsencrypt.bats
index e764527b..fc6b649e 100644
--- a/test/tests/parallel/set2/tls/tls_letsencrypt.bats
+++ b/test/tests/parallel/set2/tls/tls_letsencrypt.bats
@@ -1,29 +1,22 @@
-load "${REPOSITORY_ROOT}/test/test_helper/common"
-load "${REPOSITORY_ROOT}/test/test_helper/tls"
+load "${REPOSITORY_ROOT}/test/helper/setup"
+load "${REPOSITORY_ROOT}/test/helper/common"
+load "${REPOSITORY_ROOT}/test/helper/tls"
 
-# Globals referenced from `test_helper/common`:
-# TEST_NAME TEST_FQDN TEST_TMP_CONFIG
+TEST_NAME_PREFIX='[Security] TLS (SSL_TYPE=letsencrypt):'
+CONTAINER1_NAME='dms-test_tls-letsencrypt_default-hostname'
+CONTAINER2_NAME='dms-test_tls-letsencrypt_fallback-domainname'
+CONTAINER3_NAME='dms-test_tls-letsencrypt_support-acme-json'
+export TEST_FQDN='mail.example.test'
 
-# Requires maintenance (TODO): Yes
-# Can run tests in parallel?: No
+function teardown() { _default_teardown ; }
 
-# Not parallelize friendly when TEST_NAME is static,
-# presently name of test file: `mail_ssl_letsencrypt`.
-#
-# Also shares a common TEST_TMP_CONFIG local folder,
-# Instead of individual PRIVATE_CONFIG copies.
-# For this test that is a non-issue, unless run in parallel.
-
-
-# Applies to all tests:
-function setup_file() {
+# Similar to BATS `setup()` method, but invoked manually after
+# CONTAINER_NAME has been adjusted for the running testcase.
+function _initial_setup() {
   init_with_defaults
 
-  # Override default to match the hostname we want to test against instead:
-  export TEST_FQDN='mail.example.test'
-
   # Prepare certificates in the letsencrypt supported file structure:
-  # Note Certbot uses `privkey.pem`.
+  # NOTE: Certbot uses `privkey.pem`.
   # `fullchain.pem` is currently what's detected, but we're actually providing the equivalent of `cert.pem` here.
   # TODO: Verify format/structure is supported for nginx-proxy + acme-companion (uses `acme.sh` to provision).
 
@@ -36,45 +29,38 @@ function setup_file() {
   _copy_to_letsencrypt_storage 'example.test/with_ca/ecdsa/key.rsa.pem' 'example.test/privkey.pem'
 }
 
-# Not used
-# function teardown_file() {
-# }
-
-function teardown() {
-  docker rm -f "${TEST_NAME}"
-}
-
 # Should detect and choose the cert for FQDN `mail.example.test` (HOSTNAME):
-@test "ssl(letsencrypt): Should default to HOSTNAME (mail.example.test)" {
-  local TARGET_DOMAIN='mail.example.test'
+@test "${TEST_NAME_PREFIX} Should default to HOSTNAME (${TEST_FQDN})" {
+  export CONTAINER_NAME=${CONTAINER1_NAME}
+  _initial_setup
 
-  local TEST_DOCKER_ARGS=(
+  local TARGET_DOMAIN=${TEST_FQDN}
+  local CUSTOM_SETUP_ARGUMENTS=(
     --volume "${TEST_TMP_CONFIG}/letsencrypt/${TARGET_DOMAIN}/:/etc/letsencrypt/live/${TARGET_DOMAIN}/:ro"
     --env PERMIT_DOCKER='container'
     --env SSL_TYPE='letsencrypt'
   )
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
 
-  common_container_setup 'TEST_DOCKER_ARGS'
-
-  #test hostname has certificate files
+  # Test that certificate files exist for the configured `hostname`:
   _should_have_valid_config "${TARGET_DOMAIN}" 'privkey.pem' 'fullchain.pem'
   _should_succesfully_negotiate_tls "${TARGET_DOMAIN}"
   _should_not_support_fqdn_in_cert 'example.test'
 }
 
-
 # Should detect and choose cert for FQDN `example.test` (DOMAINNAME),
 # as fallback when no cert for FQDN `mail.example.test` (HOSTNAME) exists:
-@test "ssl(letsencrypt): Should fallback to DOMAINNAME (example.test)" {
-  local TARGET_DOMAIN='example.test'
+@test "${TEST_NAME_PREFIX} Should fallback to DOMAINNAME (example.test)" {
+  export CONTAINER_NAME=${CONTAINER2_NAME}
+  _initial_setup
 
-  local TEST_DOCKER_ARGS=(
+  local TARGET_DOMAIN='example.test'
+  local CUSTOM_SETUP_ARGUMENTS=(
     --volume "${TEST_TMP_CONFIG}/letsencrypt/${TARGET_DOMAIN}/:/etc/letsencrypt/live/${TARGET_DOMAIN}/:ro"
     --env PERMIT_DOCKER='container'
     --env SSL_TYPE='letsencrypt'
   )
-
-  common_container_setup 'TEST_DOCKER_ARGS'
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
 
   #test domain has certificate files
   _should_have_valid_config "${TARGET_DOMAIN}" 'privkey.pem' 'fullchain.pem'
@@ -87,34 +73,36 @@ function teardown() {
 #
 # NOTE: Currently all of the `acme.json` configs have the FQDN match a SAN value,
 # all Subject CN (`main` in acme.json) are `Smallstep Leaf` which is not an FQDN.
-# While valid for that field, it does mean there is no test coverage against `main`.
-@test "ssl(letsencrypt): Traefik 'acme.json' (*.example.test)" {
-  # This test group changes to certs signed with an RSA Root CA key,
-  # These certs all support both FQDNs: `mail.example.test` and `example.test`,
-  # Except for the wildcard cert `*.example.test`, which intentionally excluded `example.test` when created.
-  # We want to maintain the same FQDN (mail.example.test) between the _acme_ecdsa and _acme_rsa tests.
-  local LOCAL_BASE_PATH="${PWD}/test/test-files/ssl/example.test/with_ca/rsa"
+# While not using a FQDN is valid for that field,
+# it does mean there is no test coverage against the `acme.json` field `main`.
+@test "${TEST_NAME_PREFIX} Traefik 'acme.json' (*.example.test)" {
+  export CONTAINER_NAME=${CONTAINER3_NAME}
+  _initial_setup
 
-  # Change default Root CA cert used for verifying chain of trust with openssl:
+  # Override the `_initial_setup()` default Root CA cert (used for verifying the chain of trust via `openssl`):
   # shellcheck disable=SC2034
   local TEST_CA_CERT="${TEST_FILES_CONTAINER_PATH}/ssl/example.test/with_ca/rsa/ca-cert.rsa.pem"
 
+  # This test group switches to certs that are signed with an RSA Root CA key instead.
+  # All of these certs support both FQDNs (`mail.example.test` and `example.test`),
+  # Except for the wildcard cert (`*.example.test`), that was created with `example.test` intentionally excluded from SAN.
+  # We want to maintain the same FQDN (`mail.example.test`) between the _acme_ecdsa and _acme_rsa tests.
+  local LOCAL_BASE_PATH="${PWD}/test/test-files/ssl/example.test/with_ca/rsa"
+
   function _prepare() {
     # Default `acme.json` for _acme_ecdsa test:
     cp "${LOCAL_BASE_PATH}/ecdsa.acme.json" "${TEST_TMP_CONFIG}/letsencrypt/acme.json"
 
     # TODO: Provision wildcard certs via Traefik to inspect if `example.test` non-wildcard is also added to the cert.
-    # shellcheck disable=SC2034
-    local TEST_DOCKER_ARGS=(
+    local CUSTOM_SETUP_ARGUMENTS=(
       --volume "${TEST_TMP_CONFIG}/letsencrypt/acme.json:/etc/letsencrypt/acme.json:ro"
       --env LOG_LEVEL='trace'
       --env PERMIT_DOCKER='container'
       --env SSL_DOMAIN='*.example.test'
       --env SSL_TYPE='letsencrypt'
     )
-
-    common_container_setup 'TEST_DOCKER_ARGS'
-    wait_for_service "${TEST_NAME}" 'changedetector'
+    common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
+    wait_for_service "${CONTAINER_NAME}" 'changedetector'
 
     # Wait until the changedetector service startup delay is over:
     repeat_until_success_or_timeout 20 sh -c "$(_get_service_logs 'changedetector') | grep 'Changedetector is ready'"
@@ -184,7 +172,6 @@ function teardown() {
 # Test Methods
 #
 
-
 # Check that Dovecot and Postfix are configured to use a cert for the expected FQDN:
 function _should_have_valid_config() {
   local EXPECTED_FQDN=${1}
@@ -199,16 +186,14 @@ function _should_have_valid_config() {
 
 # CMD ${1} run in container with output checked to match value of ${2}:
 function _has_matching_line() {
-  run docker exec "${TEST_NAME}" sh -c "${1} | grep '${2}'"
+  _run_in_container bash -c "${1} | grep '${2}'"
   assert_output "${2}"
 }
 
-
 #
 # Traefik `acme.json` specific
 #
 
-
 # It should log success of extraction for the expected domain and restart Postfix.
 function _should_have_succeeded_at_extraction() {
   local EXPECTED_DOMAIN=${1}
@@ -249,7 +234,7 @@ function _should_have_service_reload_count() {
   local NUM_RELOADS=${1}
 
   # Count how many times processes (like Postfix and Dovecot) have been reloaded by the `changedetector` service:
-  run docker exec "${TEST_NAME}" sh -c "grep -c 'Completed handling of detected change' /var/log/supervisor/changedetector.log"
+  _run_in_container grep --count 'Completed handling of detected change' '/var/log/supervisor/changedetector.log'
   assert_output "${NUM_RELOADS}"
 }
 
@@ -265,12 +250,10 @@ function _should_have_expected_files() {
   _should_be_equal_in_content "${LE_CERT_PATH}" "${EXPECTED_CERT_PATH}"
 }
 
-
 #
 # Misc
 #
 
-
 # Rename test certificate files to match the expected file structure for letsencrypt:
 function _copy_to_letsencrypt_storage() {
   local SRC=${1}
@@ -280,14 +263,18 @@ function _copy_to_letsencrypt_storage() {
   FQDN_DIR=$(echo "${DEST}" | cut -d '/' -f1)
   mkdir -p "${TEST_TMP_CONFIG}/letsencrypt/${FQDN_DIR}"
 
-  cp "${PWD}/test/test-files/ssl/${SRC}" "${TEST_TMP_CONFIG}/letsencrypt/${DEST}"
+  if ! cp "${PWD}/test/test-files/ssl/${SRC}" "${TEST_TMP_CONFIG}/letsencrypt/${DEST}"
+  then
+    echo "Could not copy cert file '${SRC}'' to '${DEST}'" >&2
+    exit 1
+  fi
 }
 
 function _should_be_equal_in_content() {
   local CONTAINER_PATH=${1}
   local LOCAL_PATH=${2}
 
-  run docker exec "${TEST_NAME}" sh -c "cat ${CONTAINER_PATH}"
+  _run_in_container /bin/bash -c "cat ${CONTAINER_PATH}"
   assert_output "$(cat "${LOCAL_PATH}")"
   assert_success
 }
@@ -295,13 +282,13 @@ function _should_be_equal_in_content() {
 function _get_service_logs() {
   local SERVICE=${1:-'mailserver'}
 
-  local CMD_LOGS=(docker exec "${TEST_NAME}" "supervisorctl tail -2200 ${SERVICE}")
+  local CMD_LOGS=(docker exec "${CONTAINER_NAME}" "supervisorctl tail -2200 ${SERVICE}")
 
   # As the `mailserver` service logs are not stored in a file but output to stdout/stderr,
   # The `supervisorctl tail` command won't work; we must instead query via `docker logs`:
   if [[ ${SERVICE} == 'mailserver' ]]
   then
-    CMD_LOGS=(docker logs "${TEST_NAME}")
+    CMD_LOGS=(docker logs "${CONTAINER_NAME}")
   fi
 
   echo "${CMD_LOGS[@]}"
diff --git a/test/tests/parallel/set2/tls/tls_manual.bats b/test/tests/parallel/set2/tls/tls_manual.bats
index d2c34cc5..bf0d2d86 100644
--- a/test/tests/parallel/set2/tls/tls_manual.bats
+++ b/test/tests/parallel/set2/tls/tls_manual.bats
@@ -1,8 +1,11 @@
-#!/usr/bin/env bats
-load "${REPOSITORY_ROOT}/test/test_helper/common"
+load "${REPOSITORY_ROOT}/test/helper/setup"
+load "${REPOSITORY_ROOT}/test/helper/common"
+
+TEST_NAME_PREFIX='[Security] TLS (SSL_TYPE=manual):'
+CONTAINER_NAME='dms-test_tls-manual'
 
 function setup_file() {
-  # Internal copies made by `start-mailserver.sh`:
+  # Internal copies made by `scripts/helpers/ssl.sh`:
   export PRIMARY_KEY='/etc/dms/tls/key'
   export PRIMARY_CERT='/etc/dms/tls/cert'
   export FALLBACK_KEY='/etc/dms/tls/fallback_key'
@@ -14,98 +17,101 @@ function setup_file() {
   export SSL_ALT_KEY_PATH='/config/ssl/key.rsa.pem'
   export SSL_ALT_CERT_PATH='/config/ssl/cert.rsa.pem'
 
-  local PRIVATE_CONFIG
-  export DOMAIN_SSL_MANUAL='example.test'
-  PRIVATE_CONFIG=$(duplicate_config_for_container .)
+  export TEST_DOMAIN='example.test'
 
-  docker run -d --name mail_manual_ssl \
-    --volume "${PRIVATE_CONFIG}/:/tmp/docker-mailserver/" \
-    --volume "$(pwd)/test/test-files/ssl/${DOMAIN_SSL_MANUAL}/with_ca/ecdsa/:/config/ssl/:ro" \
-    --env LOG_LEVEL='trace' \
-    --env SSL_TYPE='manual' \
-    --env TLS_LEVEL='modern' \
-    --env SSL_KEY_PATH="${SSL_KEY_PATH}" \
-    --env SSL_CERT_PATH="${SSL_CERT_PATH}" \
-    --env SSL_ALT_KEY_PATH="${SSL_ALT_KEY_PATH}" \
-    --env SSL_ALT_CERT_PATH="${SSL_ALT_CERT_PATH}" \
-    --hostname "mail.${DOMAIN_SSL_MANUAL}" \
-    --tty \
-    "${NAME}" # Image name
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --volume "${PWD}/test/test-files/ssl/${TEST_DOMAIN}/with_ca/ecdsa/:/config/ssl/:ro"
+    --env LOG_LEVEL='trace'
+    --env SSL_TYPE='manual'
+    --env TLS_LEVEL='modern'
+    --env SSL_KEY_PATH="${SSL_KEY_PATH}"
+    --env SSL_CERT_PATH="${SSL_CERT_PATH}"
+    --env SSL_ALT_KEY_PATH="${SSL_ALT_KEY_PATH}"
+    --env SSL_ALT_CERT_PATH="${SSL_ALT_CERT_PATH}"
+  )
 
-  wait_for_finished_setup_in_container mail_manual_ssl
+  init_with_defaults
+  # Override the default set in `common_container_setup`:
+  export TEST_FQDN="mail.${TEST_DOMAIN}"
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
 }
 
-function teardown_file() {
-  docker rm -f mail_manual_ssl
+function teardown_file() { _default_teardown ; }
+
+@test "${TEST_NAME_PREFIX} ENV vars provided are valid files" {
+  _run_in_container [ -f "${SSL_CERT_PATH}" ]
+  assert_success
+
+  _run_in_container [ -f "${SSL_KEY_PATH}" ]
+  assert_success
+
+  _run_in_container [ -f "${SSL_ALT_CERT_PATH}" ]
+  assert_success
+
+  _run_in_container [ -f "${SSL_ALT_KEY_PATH}" ]
+  assert_success
 }
 
-@test "checking ssl: ENV vars provided are valid files" {
-  assert docker exec mail_manual_ssl [ -f "${SSL_CERT_PATH}" ]
-  assert docker exec mail_manual_ssl [ -f "${SSL_KEY_PATH}" ]
-  assert docker exec mail_manual_ssl [ -f "${SSL_ALT_CERT_PATH}" ]
-  assert docker exec mail_manual_ssl [ -f "${SSL_ALT_KEY_PATH}" ]
-}
-
-@test "checking ssl: manual configuration is correct" {
+@test "${TEST_NAME_PREFIX} manual configuration is correct" {
   local DOVECOT_CONFIG_SSL='/etc/dovecot/conf.d/10-ssl.conf'
 
-  run docker exec mail_manual_ssl grep '^smtpd_tls_chain_files =' '/etc/postfix/main.cf'
+  _run_in_container grep '^smtpd_tls_chain_files =' '/etc/postfix/main.cf'
   assert_success
   assert_output "smtpd_tls_chain_files = ${PRIMARY_KEY} ${PRIMARY_CERT} ${FALLBACK_KEY} ${FALLBACK_CERT}"
 
-  run docker exec mail_manual_ssl grep '^ssl_key =' "${DOVECOT_CONFIG_SSL}"
+  _run_in_container grep '^ssl_key =' "${DOVECOT_CONFIG_SSL}"
   assert_success
   assert_output "ssl_key = <${PRIMARY_KEY}"
 
-  run docker exec mail_manual_ssl grep '^ssl_cert =' "${DOVECOT_CONFIG_SSL}"
+  _run_in_container grep '^ssl_cert =' "${DOVECOT_CONFIG_SSL}"
   assert_success
   assert_output "ssl_cert = <${PRIMARY_CERT}"
 
-  run docker exec mail_manual_ssl grep '^ssl_alt_key =' "${DOVECOT_CONFIG_SSL}"
+  _run_in_container grep '^ssl_alt_key =' "${DOVECOT_CONFIG_SSL}"
   assert_success
   assert_output "ssl_alt_key = <${FALLBACK_KEY}"
 
-  run docker exec mail_manual_ssl grep '^ssl_alt_cert =' "${DOVECOT_CONFIG_SSL}"
+  _run_in_container grep '^ssl_alt_cert =' "${DOVECOT_CONFIG_SSL}"
   assert_success
   assert_output "ssl_alt_cert = <${FALLBACK_CERT}"
 }
 
-@test "checking ssl: manual configuration copied files correctly " {
-  run docker exec mail_manual_ssl cmp -s "${PRIMARY_KEY}" "${SSL_KEY_PATH}"
+@test "${TEST_NAME_PREFIX} manual configuration copied files correctly " {
+  _run_in_container cmp -s "${PRIMARY_KEY}" "${SSL_KEY_PATH}"
   assert_success
-  run docker exec mail_manual_ssl cmp -s "${PRIMARY_CERT}" "${SSL_CERT_PATH}"
+  _run_in_container cmp -s "${PRIMARY_CERT}" "${SSL_CERT_PATH}"
   assert_success
 
   # Fallback cert
-  run docker exec mail_manual_ssl cmp -s "${FALLBACK_KEY}" "${SSL_ALT_KEY_PATH}"
+  _run_in_container cmp -s "${FALLBACK_KEY}" "${SSL_ALT_KEY_PATH}"
   assert_success
-  run docker exec mail_manual_ssl cmp -s "${FALLBACK_CERT}" "${SSL_ALT_CERT_PATH}"
+  _run_in_container cmp -s "${FALLBACK_CERT}" "${SSL_ALT_CERT_PATH}"
   assert_success
 }
 
-@test "checking ssl: manual cert works correctly" {
-  wait_for_tcp_port_in_container 587 mail_manual_ssl
+@test "${TEST_NAME_PREFIX} manual cert works correctly" {
+  wait_for_tcp_port_in_container 587 "${CONTAINER_NAME}"
 
   local TEST_COMMAND=(timeout 1 openssl s_client -connect mail.example.test:587 -starttls smtp)
   local RESULT
 
   # Should fail as a chain of trust is required to verify successfully:
-  RESULT=$(docker exec mail_manual_ssl "${TEST_COMMAND[@]}" | grep 'Verification error:')
+  RESULT=$(docker exec "${CONTAINER_NAME}" "${TEST_COMMAND[@]}" | grep 'Verification error:')
   assert_equal "${RESULT}" 'Verification error: unable to verify the first certificate'
 
   # Provide the Root CA cert for successful verification:
   local CA_CERT='/config/ssl/ca-cert.ecdsa.pem'
-  assert docker exec mail_manual_ssl [ -f "${CA_CERT}" ]
-  RESULT=$(docker exec mail_manual_ssl "${TEST_COMMAND[@]}" -CAfile "${CA_CERT}" | grep 'Verification: OK')
+  assert docker exec "${CONTAINER_NAME}" [ -f "${CA_CERT}" ]
+  RESULT=$(docker exec "${CONTAINER_NAME}" "${TEST_COMMAND[@]}" -CAfile "${CA_CERT}" | grep 'Verification: OK')
   assert_equal "${RESULT}" 'Verification: OK'
 }
 
-@test "checking ssl: manual cert changes are picked up by check-for-changes" {
+@test "${TEST_NAME_PREFIX} manual cert changes are picked up by check-for-changes" {
   printf '%s' 'someThingsChangedHere' \
-    >>"$(pwd)/test/test-files/ssl/${DOMAIN_SSL_MANUAL}/with_ca/ecdsa/key.ecdsa.pem"
+    >>"$(pwd)/test/test-files/ssl/${TEST_DOMAIN}/with_ca/ecdsa/key.ecdsa.pem"
 
-  run timeout 15 docker exec mail_manual_ssl bash -c "tail -F /var/log/supervisor/changedetector.log | sed '/Manual certificates have changed/ q'"
+  run timeout 15 docker exec "${CONTAINER_NAME}" bash -c "tail -F /var/log/supervisor/changedetector.log | sed '/Manual certificates have changed/ q'"
   assert_success
 
-  sed -i '/someThingsChangedHere/d' "$(pwd)/test/test-files/ssl/${DOMAIN_SSL_MANUAL}/with_ca/ecdsa/key.ecdsa.pem"
+  sed -i '/someThingsChangedHere/d' "$(pwd)/test/test-files/ssl/${TEST_DOMAIN}/with_ca/ecdsa/key.ecdsa.pem"
 }
diff --git a/test/tests/parallel/set3/dovecot_inet_protocol.bats b/test/tests/parallel/set3/dovecot_inet_protocol.bats
index b6fdf3cb..ce7bd832 100644
--- a/test/tests/parallel/set3/dovecot_inet_protocol.bats
+++ b/test/tests/parallel/set3/dovecot_inet_protocol.bats
@@ -2,9 +2,14 @@ load "${REPOSITORY_ROOT}/test/helper/setup"
 load "${REPOSITORY_ROOT}/test/helper/common"
 
 TEST_NAME_PREFIX='Dovecot protocols:'
+CONTAINER1_NAME='dms-test_dovecot_protocols_all'
+CONTAINER2_NAME='dms-test_dovecot_protocols_ipv4'
+CONTAINER3_NAME='dms-test_dovecot_protocols_ipv6'
+
+function teardown() { _default_teardown ; }
 
 @test "${TEST_NAME_PREFIX} dual-stack IP configuration" {
-  local CONTAINER_NAME='dms-test-dovecot_protocols_all'
+  export CONTAINER_NAME=${CONTAINER1_NAME}
   local CUSTOM_SETUP_ARGUMENTS=(--env DOVECOT_INET_PROTOCOLS=)
 
   init_with_defaults
@@ -13,12 +18,10 @@ TEST_NAME_PREFIX='Dovecot protocols:'
   _run_in_container grep '^#listen = \*, ::' /etc/dovecot/dovecot.conf
   assert_success
   assert_output '#listen = *, ::'
-
-  docker rm -f "${CONTAINER_NAME}"
 }
 
 @test "${TEST_NAME_PREFIX} IPv4 configuration" {
-  local CONTAINER_NAME='dms-test-dovecot_protocols_ipv4'
+  export CONTAINER_NAME=${CONTAINER2_NAME}
   local CUSTOM_SETUP_ARGUMENTS=(--env DOVECOT_INET_PROTOCOLS=ipv4)
 
   init_with_defaults
@@ -27,12 +30,10 @@ TEST_NAME_PREFIX='Dovecot protocols:'
   _run_in_container grep '^listen = \*$' /etc/dovecot/dovecot.conf
   assert_success
   assert_output 'listen = *'
-
-  docker rm -f "${CONTAINER_NAME}"
 }
 
 @test "${TEST_NAME_PREFIX} IPv6 configuration" {
-  local CONTAINER_NAME='dms-test-dovecot_protocols_ipv6'
+  export CONTAINER_NAME=${CONTAINER3_NAME}
   local CUSTOM_SETUP_ARGUMENTS=(--env DOVECOT_INET_PROTOCOLS=ipv6)
 
   init_with_defaults
@@ -41,6 +42,4 @@ TEST_NAME_PREFIX='Dovecot protocols:'
   _run_in_container grep '^listen = \[::\]$' /etc/dovecot/dovecot.conf
   assert_success
   assert_output 'listen = [::]'
-
-  docker rm -f "${CONTAINER_NAME}"
 }
diff --git a/test/tests/parallel/set3/helper-functions.bats b/test/tests/parallel/set3/helper-functions.bats
index 24ee2f68..510d79c7 100644
--- a/test/tests/parallel/set3/helper-functions.bats
+++ b/test/tests/parallel/set3/helper-functions.bats
@@ -2,7 +2,7 @@ load "${REPOSITORY_ROOT}/test/helper/setup"
 load "${REPOSITORY_ROOT}/test/helper/common"
 
 TEST_NAME_PREFIX='helper functions inside container:'
-CONTAINER_NAME='dms-test-helper_functions'
+CONTAINER_NAME='dms-test_helper_functions'
 
 function setup_file() {
   init_with_defaults