Add bazel worker support to the dev compiler.

test/worker/worker_test.dart

+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// 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.
+
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:bazel_worker/bazel_worker.dart';
+// TODO(jakemac): Remove once this is a part of the testing library.
+import 'package:bazel_worker/src/async_message_grouper.dart';
+import 'package:bazel_worker/testing.dart';
+import 'package:test/test.dart';
+
+main() {
+  group('Hello World', () {
+    final inputDartFile = new File('test/worker/hello_world.dart').absolute;
+    final outputJsFile = new File('test/worker/hello_world.js').absolute;
+    final executableArgs = [
+      'bin/dartdevc.dart',
+      'compile',
+    ];
+    final compilerArgs = [
+      '--no-source-map',
+      '--no-summarize',
+      '-o',
+      outputJsFile.path,
+      inputDartFile.path,
+    ];
+
+    tearDown(() {
+      if (outputJsFile.existsSync()) outputJsFile.deleteSync();
+    });
+
+    test('can compile in worker mode', () async {
+      var args = new List.from(executableArgs)..add('--persistent_worker');
+      var process = await Process.start('dart', args);
+      var messageGrouper = new AsyncMessageGrouper(process.stdout);
+
+      var request = new WorkRequest();
+      request.arguments.addAll(compilerArgs);
+
+      process.stdin.add(protoToDelimitedBuffer(request));
+
+      var buffer = await messageGrouper.next;
+      WorkResponse response;
+      try {
+        response = new WorkResponse.fromBuffer(buffer);
+      } catch (_) {
+        throw 'Failed to parse response: \n'
+            'bytes: $buffer\n'
+            'String: ${new String.fromCharCodes(buffer)}\n';
+      }
+
+      expect(response.exitCode, EXIT_CODE_OK, reason: response.output);
+      expect(response.output, isEmpty);
+
+      expect(outputJsFile.existsSync(), isTrue);
+
+      process.kill();
+
+      // TODO(jakemac): This shouldn't be necessary, but it is for the process
+      // to exit properly.
+      await messageGrouper.next;
+    });
+
+    test('can compile in basic mode', () async {

[Jennifer Messerly, 2016/04/14 21:02:15]

If you don't mind, delete my little command_test.sh and test/command folder and
calling command_test from test.sh? since you cover it here

[jakemac, 2016/04/14 21:48:25]

Done.

+      var args = new List.from(executableArgs)..addAll(compilerArgs);
+      var process = await Process.start('dart', args);
+      stderr.addStream(process.stderr);
+      var futureProcessOutput = process.stdout.map(UTF8.decode).toList();
+
+      expect(await process.exitCode, EXIT_CODE_OK);
+      expect((await futureProcessOutput).join(), isEmpty);
+      expect(outputJsFile.existsSync(), isTrue);
+    });
+  });
+}