Make parts hermetic, fixes #531

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:async';
 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';
 
+import 'package:dev_compiler/src/compiler/compiler.dart'
+    show missingPartErrorCode, unusedPartErrorCode;
+
 main() {
   group('Hello World', () {
     final argsFile = new File('test/worker/hello_world.args').absolute;
     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',
@@ skipping 146 matching lines @@
         'compile',
         '--no-source-map',
         '-o',
         badFileJs.path,
         badFileDart.path,
       ]);
       expect(result.exitCode, 1);
       expect(result.stdout, contains("[error] Expected to find ';'"));
     });
   });
+
+  group('Parts', () {
+    final partFile = new File('test/worker/greeting.dart').absolute;
+    final libraryFile = new File('test/worker/hello.dart').absolute;
+
+    final outJS = new File('test/worker/output.js').absolute;
+
+    setUp(() {
+      partFile.writeAsStringSync('part of hello;\n'
+          'String greeting = "hello";');
+      libraryFile.writeAsStringSync('library hello;\n'
+          'part "greeting.dart";\n'
+          'main() => print(greeting);\n');
+    });
+
+    tearDown(() {
+      if (partFile.existsSync()) partFile.deleteSync();
+      if (libraryFile.existsSync()) libraryFile.deleteSync();
+      if (outJS.existsSync()) outJS.deleteSync();
+    });
+
+    test('works if part and library supplied', () {
+      var result = Process.runSync('dart', [
+        'bin/dartdevc.dart',
+        'compile',
+        '--no-summarize',
+        '--no-source-map',
+        '-o',
+        outJS.path,
+        partFile.path,
+        libraryFile.path,
+      ]);
+      expect(result.stdout, isEmpty);
+      expect(result.stderr, isEmpty);
+      expect(result.exitCode, 0);
+      expect(outJS.existsSync(), isTrue);
+    });
+
+    test('error if part is not supplied', () {
+      var result = Process.runSync('dart', [
+        'bin/dartdevc.dart',
+        'compile',
+        '--no-summarize',
+        '--no-source-map',
+        '-o',
+        outJS.path,
+        libraryFile.path,
+      ]);
+      expect(
+          result.stdout,
+          startsWith('[error] ${missingPartErrorCode.message} '
+              '(test/worker/greeting.dart, line 1, col 1)'));
+      expect(result.stderr, isEmpty);
+      expect(result.exitCode, 1);
+      expect(outJS.existsSync(), isFalse);
+    });
+
+    test('error if part without library is supplied', () {
+      var result = Process.runSync('dart', [
+        'bin/dartdevc.dart',
+        'compile',
+        '--no-summarize',
+        '--no-source-map',
+        '-o',
+        outJS.path,
+        partFile.path,
+      ]);
+      expect(
+          result.stdout,
+          startsWith('[error] ${unusedPartErrorCode.message} '
+              '(test/worker/greeting.dart, line 1, col 1)'));
+      expect(result.stderr, isEmpty);
+      expect(result.exitCode, 1);
+      expect(outJS.existsSync(), isFalse);
+    });
+  });
 }
 
 Future<WorkResponse> _readResponse(MessageGrouper messageGrouper) async {
   var buffer = await messageGrouper.next;
   try {
     return new WorkResponse.fromBuffer(buffer);
   } catch (_) {
     var bufferAsString =
         buffer == null ? '' : 'String: ${UTF8.decode(buffer)}\n';
     throw 'Failed to parse response:\nbytes: $buffer\n$bufferAsString';
   }
 }