Make isolate tests work on drt (and hopefully dartium).

tests/isolate/remote_unittest_helper.dart

+// Copyright (c) 2013, 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.
+
+// Helper functions and classes for running a set of unittests in a
+// remote isolate.
+// Used to test Isolate.spawn because dartium/drt does not allow it in the DOM
+// isolate.
+
+import "dart:isolate";
+import "package:unittest/unittest.dart";
+@MirrorsUsed(symbols: "main", targets: "main", override: "*")
+import "dart:mirrors";
+
+/**
+ * Use this function at the beginning of the main method:
+ *
+ *     void main([args, port]) {
+ *       if (testRemote(main, port)) return;
+ *       // the usual test.
+ *     }
+ *
+ * Remember to import unittest using the URI `package:inittest/unittest.dart`.
+ * Otherwise it won't be sharing the `unittestConfiguration` with this library,
+ * and the override set below won't work.
+ *
+ * Returns `true` if the tests are being run remotely, and
+ * `false` if the tests should be run locally.
+ */
+bool testRemote(Function main, SendPort port) {
+  if (port != null) {
+    unittestConfiguration = new RemoteConfiguration(port);
+    return false;
+  }
+  var testResponses = new Map<String, List>();
+
+
+  ClosureMirror closure = reflect(main);
+  LibraryMirror library = closure.function.owner;
+
+  var receivePort = new ReceivePort();
+  void remoteAction(message) {
+    switch (message[0]) {
+      case "testStart":
+        String name = message[1];
+        testResponses[name] = null;
+        break;
+      case "testResult":
+      case "testResultChanged":
+        String name = message[1];
+        testResponses[name] = message;
+        break;
+      case "logMessage":
+        break;  // Ignore.
+      case "summary":
+        throw message[1];  // Uncaught error.
+      case "done":
+        receivePort.close();
+        _simulateTests(testResponses);
+        break;
+    }
+  }
+  try {
+    Isolate.spawnUri(library.uri, null, receivePort.sendPort);
+    receivePort.listen(remoteAction);
+    return true;
+  } catch (e) {
+    // spawnUri is only supported by dart2js if web workers are available.
+    // If the spawnUri fails, run the tests locally instead, since we are
+    // not in a browser anyway.
+    //
+    // That is, we assume that either Isolate.spawn or Isolate.spawnUri must
+    // work, so if spawnUri doesn't work, we can run the tests directly.
+    receivePort.close();
+    return false;
+  }
+}
+
+class RemoteConfiguration implements Configuration {
+  final SendPort _port;
+  Duration timeout = const Duration(minutes: 2);
+
+  RemoteConfiguration(this._port);
+
+  bool get autoStart => true;
+
+  void onInit() { }
+
+  void onStart() { }
+
+  void onTestStart(TestCase testCase) {
+    _port.send(["testStart", testCase.description]);
+  }
+
+  void onTestResult(TestCase testCase) {
+    _port.send(["testResult", testCase.description,
+                testCase.result, testCase.message]);
+  }
+
+  void onTestResultChanged(TestCase testCase) {
+    _port.send(["testResultChanged", testCase.description,
+                testCase.result, testCase.message]);
+  }
+
+  void onLogMessage(TestCase testCase, String message) {
+    _port.send(["logMessage", testCase.description, message]);
+  }
+
+  void onDone(bool success) {
+    _port.send(["done", success]);
+  }
+
+  void onSummary(int passed, int failed, int errors, List<TestCase> results,
+      String uncaughtError) {
+    if (uncaughtError != null) {
+      _port.send(["summary", uncaughtError]);
+    }
+  }
+}
+
+void _simulateTests(Map<String, List> responses) {
+  // Start all unit tests in the same event.
+  responses.forEach((name, response) {
+    test(name, () {
+      var result = response[2];
+      var message = response[3];
+      if (result == FAIL) {
+        fail(message);
+      } else if (result == ERROR) {
+        throw message;
+      }
+    });
+  });
+}