Add an integration test for serve (#37)

Author: kevmoo

webdev/test/e2e_test.dart

@@ -2,8 +2,9 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-@Timeout(const Duration(minutes: 8))
+@Timeout(const Duration(minutes: 5))
 
+import 'dart:async';
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
@@ -14,26 +15,39 @@ import 'package:webdev/src/util.dart';
 
 import 'test_utils.dart';
 
+/// Key: name of file in web directory
+/// Value: `null`  - exists in both modes
+///        `true`  - DDC only
+///        `false` - dart2js only
+const _testItems = const <String, bool>{
+  'main.dart.js': null,
+  'main.dart.bootstrap.js': true,
+  'main.ddc.js': true
+};
+
 void main() {
-  group('should succeed with valid configuration', () {
-    for (var withDDC in [true, false]) {
-      test(withDDC ? 'DDC' : 'dart2js', () async {
-        var exampleDirectory = p.absolute(p.join(p.current, '..', 'example'));
-        var process = await TestProcess.start(pubPath, ['get'],
-            workingDirectory: exampleDirectory,
-            environment: _getPubEnvironment());
+  String exampleDirectory;
+  setUpAll(() async {
+    exampleDirectory = p.absolute(p.join(p.current, '..', 'example'));
 
-        await process.shouldExit(0);
+    var process = await TestProcess.start(pubPath, ['get'],
+        workingDirectory: exampleDirectory, environment: _getPubEnvironment());
 
-        await d.file('.packages', isNotEmpty).validate(exampleDirectory);
-        await d.file('pubspec.lock', isNotEmpty).validate(exampleDirectory);
+    await process.shouldExit(0);
 
+    await d.file('.packages', isNotEmpty).validate(exampleDirectory);
+    await d.file('pubspec.lock', isNotEmpty).validate(exampleDirectory);
+  });
+
+  group('should build with valid configuration', () {
+    for (var withDDC in [true, false]) {
+      test(withDDC ? 'DDC' : 'dart2js', () async {
         var args = ['build', '-o', 'web:${d.sandbox}'];
         if (withDDC) {
           args.add('--no-release');
         }
 
-        process = await runWebDev(args, workingDirectory: exampleDirectory);
+        var process = await runWebDev(args, workingDirectory: exampleDirectory);
 
         var expectedItems = <Object>['[INFO] Succeeded'];
         if (!withDDC) {
@@ -44,18 +58,69 @@ void main() {
         await checkProcessStdout(process, expectedItems);
         await process.shouldExit(0);
 
-        await d.file('main.dart.js', isNotEmpty).validate();
+        for (var entry in _testItems.entries) {
+          var shouldExist = (entry.value ?? withDDC) == withDDC;
 
-        for (var ddcFile in ['main.dart.bootstrap.js', 'main.ddc.js']) {
-          if (withDDC) {
-            await d.file(ddcFile, isNotEmpty).validate();
+          if (shouldExist) {
+            await d.file(entry.key, isNotEmpty).validate();
           } else {
-            await d.nothing(ddcFile).validate();
+            await d.nothing(entry.key).validate();
           }
         }
       });
     }
   });
+
+  group('should serve with valid configuration', () {
+    for (var withDDC in [true, false]) {
+      test(withDDC ? 'DDC' : 'dart2js', () async {
+        var openPort = await _getOpenPort();
+        var args = ['serve', 'web:$openPort'];
+        if (!withDDC) {
+          args.add('--release');
+        }
+
+        var process = await runWebDev(args, workingDirectory: exampleDirectory);
+
+        var hostUrl = 'http://localhost:$openPort';
+
+        await expectLater(
+            process.stdout, emitsThrough('Serving `web` on $hostUrl'));
+
+        var client = new HttpClient();
+
+        try {
+          for (var entry in _testItems.entries) {
+            var url = Uri.parse('$hostUrl/${entry.key}');
+
+            var request = await client.getUrl(url);
+            var response = await request.close();
+
+            var shouldExist = (entry.value ?? withDDC) == withDDC;
+
+            if (entry.key == 'main.ddc.js') {
+              // This file SHOULD NOT be output in dart2js mode
+              // But there is an issue here
+              // https://github.com/dart-lang/build/issues/1033
+              shouldExist = true;
+            }
+
+            expect(response.statusCode, shouldExist ? 200 : 404);
+          }
+        } finally {
+          client.close(force: true);
+        }
+
+        if (Platform.isWindows) {
+          await process.kill();
+          await process.shouldExit(-1);
+        } else {
+          process.signal(ProcessSignal.SIGINT);
+          await process.shouldExit(0);
+        }
+      });
+    }
+  });
 }
 
 /// Returns an environment map that includes `PUB_ENVIRONMENT`.
@@ -74,3 +139,22 @@ Map<String, String> _getPubEnvironment() {
 
   return environment;
 }
+
+/// Returns an open port by creating a temporary Socket
+Future<int> _getOpenPort() async {
+  ServerSocket socket;
+
+  try {
+    socket = await ServerSocket.bind(InternetAddress.LOOPBACK_IP_V4, 0);
+  } catch (_) {
+    // try again v/ V6 only. Slight possibility that V4 is disabled
+    socket = await ServerSocket.bind(InternetAddress.LOOPBACK_IP_V6, 0,
+        v6Only: true);
+  }
+
+  try {
+    return socket.port;
+  } finally {
+    await socket.close();
+  }
+}