Add tests for behaviour mentioned in #1079 (#1084)

test/integration/basic/pages/nav/querystring.js

@@ -0,0 +1,22 @@
+import React from 'react'
+import Link from 'next/link'
+
+export default class AsyncProps extends React.Component {
+  static async getInitialProps ({ query: { id = 0 } }) {
+    return { id }
+  }
+
+  render () {
+    return (
+      <div>
+        <Link href={`/nav/querystring?id=${parseInt(this.props.id) + 1}`}>
+          <a id='next-id-link'>Click here</a>
+        </Link>
+        <Link href='/nav/querystring'>
+          <a id='main-page'>Click here</a>
+        </Link>
+        <p className={`nav-id-${this.props.id}`}>{this.props.id}</p>
+      </div>
+    )
+  }
+}

test/integration/basic/test/client-navigation.js

@@ -59,5 +59,29 @@ export default (context) => {
         await browser.close()
       })
     })
+
+    describe('with the same page but different querystring', () => {
+      it('should navigate the page', async () => {
+        const browser = await webdriver(context.appPort, '/nav/querystring?id=1')
+        const text = await browser
+          .elementByCss('#next-id-link').click()
+          .waitForElementByCss('.nav-id-2')
+          .elementByCss('p').text()
+
+        expect(text).toBe('2')
+        await browser.close()
+      })
+
+      it('should remove querystring', async () => {
+        const browser = await webdriver(context.appPort, '/nav/querystring?id=1')
+        const text = await browser
+          .elementByCss('#main-page').click()
+          .waitForElementByCss('.nav-id-0')
+          .elementByCss('p').text()
+
+        expect(text).toBe('0')
+        await browser.close()
+      })
+    })
   })
 }