Introduce the "Embedded" category.

tests/compiler/dart2js/categories_test.dart

Index: tests/compiler/dart2js/categories_test.dart
diff --git a/tests/compiler/dart2js/categories_test.dart b/tests/compiler/dart2js/categories_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3b22453112ca073a27266c86ad772165cf6b10ed
--- /dev/null
+++ b/tests/compiler/dart2js/categories_test.dart
@@ -0,0 +1,35 @@
+// 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.
+
+import "package:expect/expect.dart";
+import 'package:async_helper/async_helper.dart';
+
+import "memory_compiler.dart";
+
+runTest(String source, String categories, int expectedErrors) async {
+  var collector = new DiagnosticCollector();
+  await runCompiler(
+      memorySourceFiles: {"main.dart": source},
+      options: ["--categories=$categories"],
+      diagnosticHandler: collector);
+  Expect.equals(expectedErrors, collector.errors.length);
+  Expect.equals(0, collector.warnings.length);
+}
+
+void main() {
+  asyncTest(() async {
+    await runTest("import 'dart:async'; main() {}", "Embedded", 1);
+    await runTest("import 'dart:async'; main() {}", "Client", 0);
+    await runTest("import 'dart:async'; main() {}", "Server", 0);
+    await runTest("import 'dart:html'; main() {}", "Embedded", 1);
+    await runTest("import 'dart:html'; main() {}", "Client", 0);
+    await runTest("import 'dart:html'; main() {}", "Server", 1);
+    await runTest("import 'dart:io'; main() {}", "Embedded", 1);
+    await runTest("import 'dart:io'; main() {}", "Client", 1);
+    await runTest("import 'dart:io'; main() {}", "Server", 0);
+    await runTest("import 'dart:_internal'; main() {}", "Embedded", 2);
+    await runTest("import 'dart:_internal'; main() {}", "Client", 2);
+    await runTest("import 'dart:_internal'; main() {}", "Server", 2);
+  });
+}