Add some test cases for nested pages with next export.

test/integration/static/pages/index.js

@@ -39,6 +39,12 @@ export default () => (
       >
         <a id='dynamic-2'>Dynamic 2</a>
       </Link>
+      <Link href='/level1'>
+        <a id='level1-home-page'>Level1 home page</a>
+      </Link>
+      <Link href='/level1/about'>
+        <a id='level1-about-page'>Level1 about page</a>
+      </Link>
     </div>
     <p>This is the home page</p>
     <style jsx>{`

test/integration/static/pages/level1/about.js

@@ -0,0 +1,12 @@
+import Link from 'next/link'
+
+export default () => (
+  <div id='level1-about-page'>
+    <div>
+      <Link href='/'>
+        <a>Go Back</a>
+      </Link>
+    </div>
+    <p>This is the Level1 about page</p>
+  </div>
+)

test/integration/static/pages/level1/index.js

@@ -0,0 +1,12 @@
+import Link from 'next/link'
+
+export default () => (
+  <div id='level1-home-page'>
+    <div>
+      <Link href='/'>
+        <a>Go Back</a>
+      </Link>
+    </div>
+    <p>This is the Level1 home page</p>
+  </div>
+)

test/integration/static/test/browser.js

@@ -92,5 +92,29 @@ export default function (context) {
 
       browser.close()
     })
+
+    describe('pages in the nested level: level1', () => {
+      it('should render the home page', async () => {
+        const browser = await webdriver(context.port, '/')
+        const text = await browser
+            .elementByCss('#level1-home-page').click()
+            .waitForElementByCss('#level1-home-page')
+            .elementByCss('#level1-home-page p').text()
+
+        expect(text).toBe('This is the Level1 home page')
+        browser.close()
+      })
+
+      it('should render the about page', async () => {
+        const browser = await webdriver(context.port, '/')
+        const text = await browser
+            .elementByCss('#level1-about-page').click()
+            .waitForElementByCss('#level1-about-page')
+            .elementByCss('#level1-about-page p').text()
+
+        expect(text).toBe('This is the Level1 about page')
+        browser.close()
+      })
+    })
   })
 }