Add integration tests, and update .gitignore

.gitignore

@@ -11,3 +11,5 @@ npm-debug.log
 # coverage
 .nyc_output
 coverage
+
+.DS_Store

readme.md

@@ -641,7 +641,6 @@ module.exports = {
 }
 ```
 
-
 ### Customizing webpack config
 
 In order to extend our usage of `webpack`, you can define a function that extends its config via `next.config.js`.

test/integration/distDir/next.config.js

@@ -0,0 +1,7 @@
+module.exports = {
+  onDemandEntries: {
+    // Make sure entries are not getting disposed.
+    maxInactiveAge: 1000 * 60 * 60
+  },
+  distDir: 'dist'
+}

test/integration/distDir/pages/index.js

@@ -0,0 +1,3 @@
+export default () => (
+  <div>Hello World</div>
+)

test/integration/distDir/test/index.test.js

@@ -0,0 +1,49 @@
+/* global jasmine, describe, it, expect, beforeAll, afterAll */
+
+import { join } from 'path'
+import { existsSync } from 'fs'
+import {
+  nextServer,
+  nextBuild,
+  startApp,
+  stopApp,
+  renderViaHTTP
+} from 'next-test-utils'
+
+const appDir = join(__dirname, '../')
+let appPort
+let server
+let app
+jasmine.DEFAULT_TIMEOUT_INTERVAL = 40000
+
+describe('Production Usage', () => {
+  beforeAll(async () => {
+    await nextBuild(appDir)
+    app = nextServer({
+      dir: join(__dirname, '../'),
+      dev: false,
+      quiet: true
+    })
+
+    server = await startApp(app)
+    appPort = server.address().port
+  })
+  afterAll(() => stopApp(server))
+
+  describe('With basic usage', () => {
+    it('should render the page', async () => {
+      const html = await renderViaHTTP(appPort, '/')
+      expect(html).toMatch(/Hello World/)
+    })
+  })
+
+  describe('File locations', () => {
+    it('should build the app within the given `dist` directory', () => {
+      expect(existsSync(join(__dirname, '/../dist/app.js'))).toBeTruthy()
+    })
+
+    it('should not build the app within the default `.next` directory', () => {
+      expect(existsSync(join(__dirname, '/../.next/app.js'))).toBeFalsy()
+    })
+  })
+})