Add support for running browser tests to the test runner.

test/runner/browser/loader_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.
+
+import 'dart:io';
+
+import 'package:path/path.dart' as p;
+import 'package:unittest/src/backend/state.dart';
+import 'package:unittest/src/runner/test_platform.dart';
+import 'package:unittest/src/runner/loader.dart';
+import 'package:unittest/unittest.dart';
+
+import '../../io.dart';
+import '../../utils.dart';
+
+Loader _loader;
+String _sandbox;
+
+final _tests = """
+import 'dart:async';
+
+import 'package:unittest/unittest.dart';
+
+void main() {
+  test("success", () {});
+  test("failure", () => throw new TestFailure('oh no'));
+  test("error", () => throw 'oh no');
+}
+""";
+
+void main() {
+  setUp(() {
+    _loader = new Loader([TestPlatform.chrome],
+        packageRoot: p.join(packageDir, 'packages'));
+    _sandbox = Directory.systemTemp.createTempSync('unittest_').path;
+    /// TODO(nweiz): Use scheduled_test for this once it's compatible with this
+    /// version of unittest.
+    new File(p.join(_sandbox, 'a_test.dart')).writeAsStringSync(_tests);
+  });
+
+  tearDown(() {
+    new Directory(_sandbox).deleteSync(recursive: true);
+    return _loader.close();
+  });
+
+  group(".loadFile()", () {
+    var suite;
+    setUp(() {
+      return _loader.loadFile(p.join(_sandbox, 'a_test.dart')).then((suites) {
+        expect(suites, hasLength(1));
+        suite = suites.first;
+      });
+    });
+
+    test("returns a suite with the file path and platform", () {
+      expect(suite.path, equals(p.join(_sandbox, 'a_test.dart')));
+      expect(suite.platform, equals('Chrome'));
+    });
+
+    test("returns tests with the correct names", () {
+      expect(suite.tests, hasLength(3));
+      expect(suite.tests[0].name, equals("success"));
+      expect(suite.tests[1].name, equals("failure"));
+      expect(suite.tests[2].name, equals("error"));
+    });
+
+    test("can load and run a successful test", () {
+      var liveTest = suite.tests[0].load(suite);
+
+      expectStates(liveTest, [
+        const State(Status.running, Result.success),
+        const State(Status.complete, Result.success)
+      ]);
+      expectErrors(liveTest, []);
+
+      return liveTest.run().whenComplete(() => liveTest.close());
+    });
+
+    test("can load and run a failing test", () {
+      var liveTest = suite.tests[1].load(suite);
+      expectSingleFailure(liveTest);
+      return liveTest.run().whenComplete(() => liveTest.close());
+    });
+  });
+
+  test("throws a nice error if the package root doesn't exist", () {
+    var loader = new Loader([TestPlatform.chrome]);
+    expect(
+        loader.loadFile(p.join(_sandbox, 'a_test.dart'))
+            .whenComplete(loader.close),
+        throwsA(isLoadException(
+            "Directory ${p.join(_sandbox, 'packages')} does not exist.")));
+  });
+
+  test("loads a suite both in the browser and the VM", () {
+    var loader = new Loader([TestPlatform.vm, TestPlatform.chrome],
+        packageRoot: p.join(packageDir, 'packages'));
+    var path = p.join(_sandbox, 'a_test.dart');
+    return loader.loadFile(path).then((suites) {
+      expect(suites[0].platform, equals('VM'));
+      expect(suites[0].path, equals(path));
+      expect(suites[1].platform, equals('Chrome'));
+      expect(suites[1].path, equals(path));
+
+      for (var suite in suites) {
+        expect(suite.tests, hasLength(3));
+        expect(suite.tests[0].name, equals("success"));
+        expect(suite.tests[1].name, equals("failure"));
+        expect(suite.tests[2].name, equals("error"));
+      }
+    }).whenComplete(loader.close);
+  });
+}