Initial --modules=es6 support

test/utils_test.dart

+// Copyright (c) 2015, 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.
+
+library dev_compiler.test.utils_test;
+
+import 'package:dev_compiler/src/utils.dart';
+import 'package:test/test.dart';
+
+enum Foo {
+  first, second
+}
+
+void main() {
+  group('getEnumValue', () {
+    test('gets simple names', () {
+      expect(getEnumName(Foo.first), 'first');
+    });
+    test('chokes on invalid values', () {
+      expect(() => getEnumName(null), throws);
+      expect(() => getEnumName(''), throws);
+      expect(() => getEnumName('.'), throws);
+      expect(() => getEnumName('.a'), throws);
+      expect(() => getEnumName('a.'), throws);
+    });
+  });
+  group('parseEnum', () {
+    Foo parseFoo(String s) => parseEnum(s, Foo.values);
+    test('parses enums', () {
+      expect(parseFoo('first'), Foo.first);
+      expect(parseFoo('second'), Foo.second);
+    });
+    test('chokes on unknown enums', () {
+      expect(() => parseFoo(''), throws);
+      expect(() => parseFoo('what'), throws);
+    });
+  });
+}