Migrate async tests to strong

tests/lib_strong/async/future_test.dart

+// Copyright (c) 2012, 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 future_test;
+
+import 'package:async_helper/async_helper.dart';
+import "package:expect/expect.dart";
+import 'dart:async';
+
+const Duration MS = const Duration(milliseconds: 1);
+
+void testValue() {
+  final future = new Future<String>.value("42");
+  asyncStart();
+  future.then((x) {
+    Expect.equals("42", x);
+    asyncEnd();
+  });
+}
+
+void testSync() {
+  compare(func) {
+    // Compare the results of the following two futures.
+    Future f1 = new Future.sync(func);
+    Future f2 = new Future.value().then((_) => func());
+    f2.catchError((_) {}); // I'll get the error later.
+    f1.then((v1) {
+      f2.then((v2) {
+        Expect.equals(v1, v2);
+      });
+    }, onError: (e1) {
+      f2.then((_) {
+        Expect.fail("Expected error");
+      }, onError: (e2) {
+        Expect.equals(e1, e2);
+      });
+    });
+  }
+
+  Future val = new Future.value(42);
+  Future err1 = new Future.error("Error")..catchError((_) {});
+  try {
+    throw new List(0);
+  } catch (e, st) {
+    Future err2 = new Future.error(e, st)..catchError((_) {});
+  }
+  compare(() => 42);
+  compare(() => val);
+  compare(() {
+    throw "Flif";
+  });
+  compare(() => err1);
+  bool hasExecuted = false;
+  compare(() {
+    hasExecuted = true;
+    return 499;
+  });
+  Expect.isTrue(hasExecuted);
+}
+
+void testNeverComplete() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  future.then((v) => Expect.fail("Value not expected"));
+  future.catchError((e) => Expect.fail("Value not expected"));
+}
+
+void testComplete() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  Expect.isFalse(completer.isCompleted);
+
+  completer.complete(3);
+  Expect.isTrue(completer.isCompleted);
+
+  future.then((v) => Expect.equals(3, v));
+}
+
+// Tests for [then]
+
+void testCompleteWithSuccessHandlerBeforeComplete() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+
+  int after;
+
+  asyncStart();
+  future.then((int v) {
+    after = v;
+  }).then((_) {
+    Expect.equals(3, after);
+    asyncEnd();
+  });
+
+  completer.complete(3);
+  Expect.isNull(after);
+}
+
+void testCompleteWithSuccessHandlerAfterComplete() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+
+  int after;
+  completer.complete(3);
+  Expect.isNull(after);
+
+  asyncStart();
+  future.then((int v) {
+    after = v;
+  }).then((_) {
+    Expect.equals(3, after);
+    asyncEnd();
+  });
+}
+
+void testCompleteManySuccessHandlers() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  int before;
+  int after1;
+  int after2;
+
+  var futures = [];
+  futures.add(future.then((int v) {
+    before = v;
+  }));
+  completer.complete(3);
+  futures.add(future.then((int v) {
+    after1 = v;
+  }));
+  futures.add(future.then((int v) {
+    after2 = v;
+  }));
+
+  asyncStart();
+  Future.wait(futures).then((_) {
+    Expect.equals(3, before);
+    Expect.equals(3, after1);
+    Expect.equals(3, after2);
+    asyncEnd();
+  });
+}
+
+// Tests for [catchError]
+
+void testException() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  final ex = new Exception();
+
+  asyncStart();
+  future.then((v) {
+    throw "Value not expected";
+  }).catchError((error) {
+    Expect.equals(error, ex);
+    asyncEnd();
+  }, test: (e) => e == ex);
+  completer.completeError(ex);
+}
+
+void testExceptionHandler() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  final ex = new Exception();
+
+  var ex2;
+  var done = future.catchError((error) {
+    ex2 = error;
+  });
+
+  Expect.isFalse(completer.isCompleted);
+  completer.completeError(ex);
+  Expect.isTrue(completer.isCompleted);
+
+  asyncStart();
+  done.then((_) {
+    Expect.equals(ex, ex2);
+    asyncEnd();
+  });
+}
+
+void testExceptionHandlerReturnsTrue() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  final ex = new Exception();
+
+  bool reached = false;
+  future.catchError((e) {});
+  future.catchError((e) {
+    reached = true;
+  }, test: (e) => false).catchError((e) {});
+  Expect.isFalse(completer.isCompleted);
+  completer.completeError(ex);
+  Expect.isTrue(completer.isCompleted);
+  Expect.isFalse(reached);
+}
+
+void testExceptionHandlerReturnsTrue2() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  final ex = new Exception();
+
+  bool reached = false;
+  var done = future.catchError((e) {}, test: (e) => false).catchError((e) {
+    reached = true;
+  });
+  completer.completeError(ex);
+
+  asyncStart();
+  done.then((_) {
+    Expect.isTrue(reached);
+    asyncEnd();
+  });
+}
+
+void testExceptionHandlerReturnsFalse() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  final ex = new Exception();
+
+  bool reached = false;
+
+  future.catchError((e) {});
+
+  future.catchError((e) {
+    reached = true;
+  }, test: (e) => false).catchError((e) {});
+
+  completer.completeError(ex);
+
+  Expect.isFalse(reached);
+}
+
+void testFutureAsStreamCompleteAfter() {
+  var completer = new Completer();
+  bool gotValue = false;
+  asyncStart();
+  completer.future.asStream().listen((data) {
+    Expect.isFalse(gotValue);
+    gotValue = true;
+    Expect.equals("value", data);
+  }, onDone: () {
+    Expect.isTrue(gotValue);
+    asyncEnd();
+  });
+  completer.complete("value");
+}
+
+void testFutureAsStreamCompleteBefore() {
+  var completer = new Completer();
+  bool gotValue = false;
+  asyncStart();
+  completer.complete("value");
+  completer.future.asStream().listen((data) {
+    Expect.isFalse(gotValue);
+    gotValue = true;
+    Expect.equals("value", data);
+  }, onDone: () {
+    Expect.isTrue(gotValue);
+    asyncEnd();
+  });
+}
+
+void testFutureAsStreamCompleteImmediate() {
+  bool gotValue = false;
+  asyncStart();
+  new Future.value("value").asStream().listen((data) {
+    Expect.isFalse(gotValue);
+    gotValue = true;
+    Expect.equals("value", data);
+  }, onDone: () {
+    Expect.isTrue(gotValue);
+    asyncEnd();
+  });
+}
+
+void testFutureAsStreamCompleteErrorAfter() {
+  var completer = new Completer();
+  bool gotError = false;
+  asyncStart();
+  completer.future.asStream().listen((data) {
+    Expect.fail("Unexpected data");
+  }, onError: (error) {
+    Expect.isFalse(gotError);
+    gotError = true;
+    Expect.equals("error", error);
+  }, onDone: () {
+    Expect.isTrue(gotError);
+    asyncEnd();
+  });
+  completer.completeError("error");
+}
+
+void testFutureAsStreamWrapper() {
+  var completer = new Completer();
+  bool gotValue = false;
+  asyncStart();
+  completer.complete("value");
+  completer.future
+      .catchError((_) {
+        throw "not possible";
+      }) // Returns a future wrapper.
+      .asStream()
+      .listen((data) {
+        Expect.isFalse(gotValue);
+        gotValue = true;
+        Expect.equals("value", data);
+      }, onDone: () {
+        Expect.isTrue(gotValue);
+        asyncEnd();
+      });
+}
+
+void testFutureWhenCompleteValue() {
+  asyncStart();
+  int counter = 2;
+  countDown() {
+    if (--counter == 0) asyncEnd();
+  }
+
+  var completer = new Completer();
+  Future future = completer.future;
+  Future later = future.whenComplete(countDown);
+  later.then((v) {
+    Expect.equals(42, v);
+    countDown();
+  });
+  completer.complete(42);
+}
+
+void testFutureWhenCompleteError() {
+  asyncStart();
+  int counter = 2;
+  countDown() {
+    if (--counter == 0) asyncEnd();
+  }
+
+  var completer = new Completer();
+  Future future = completer.future;
+  Future later = future.whenComplete(countDown);
+  later.catchError((error) {
+    Expect.equals("error", error);
+    countDown();
+  });
+  completer.completeError("error");
+}
+
+void testFutureWhenCompleteValueNewError() {
+  asyncStart();
+  int counter = 2;
+  countDown() {
+    if (--counter == 0) asyncEnd();
+  }
+
+  var completer = new Completer();
+  Future future = completer.future;
+  Future later = future.whenComplete(() {
+    countDown();
+    throw "new error";
+  });
+  later.catchError((error) {
+    Expect.equals("new error", error);
+    countDown();
+  });
+  completer.complete(42);
+}
+
+void testFutureWhenCompleteErrorNewError() {
+  asyncStart();
+  int counter = 2;
+  countDown() {
+    if (--counter == 0) asyncEnd();
+  }
+
+  var completer = new Completer();
+  Future future = completer.future;
+  Future later = future.whenComplete(() {
+    countDown();
+    throw "new error";
+  });
+  later.catchError((error) {
+    Expect.equals("new error", error);
+    countDown();
+  });
+  completer.completeError("error");
+}
+
+void testFutureWhenCompletePreValue() {
+  asyncStart();
+  int counter = 2;
+  countDown() {
+    if (--counter == 0) asyncEnd();
+  }
+
+  var completer = new Completer();
+  Future future = completer.future;
+  completer.complete(42);
+  Timer.run(() {
+    Future later = future.whenComplete(countDown);
+    later.then((v) {
+      Expect.equals(42, v);
+      countDown();
+    });
+  });
+}
+
+void testFutureWhenValueFutureValue() {
+  asyncStart();
+  int counter = 3;
+  countDown(int expect) {
+    Expect.equals(expect, counter);
+    if (--counter == 0) asyncEnd();
+  }
+
+  var completer = new Completer();
+  completer.future.whenComplete(() {
+    countDown(3);
+    var completer2 = new Completer();
+    new Timer(MS * 10, () {
+      countDown(2);
+      completer2.complete(37);
+    });
+    return completer2.future;
+  }).then((v) {
+    Expect.equals(42, v);
+    countDown(1);
+  });
+
+  completer.complete(42);
+}
+
+void testFutureWhenValueFutureError() {
+  asyncStart();
+  int counter = 3;
+  countDown(int expect) {
+    Expect.equals(expect, counter);
+    if (--counter == 0) asyncEnd();
+  }
+
+  var completer = new Completer();
+  completer.future.whenComplete(() {
+    countDown(3);
+    var completer2 = new Completer();
+    new Timer(MS * 10, () {
+      countDown(2);
+      completer2.completeError("Fail");
+    });
+    return completer2.future;
+  }).then((v) {
+    Expect.fail("should fail async");
+  }, onError: (error) {
+    Expect.equals("Fail", error);
+    countDown(1);
+  });
+
+  completer.complete(42);
+}
+
+void testFutureWhenErrorFutureValue() {
+  asyncStart();
+  int counter = 3;
+  countDown(int expect) {
+    Expect.equals(expect, counter);
+    if (--counter == 0) asyncEnd();
+  }
+
+  var completer = new Completer();
+  completer.future.whenComplete(() {
+    countDown(3);
+    var completer2 = new Completer();
+    new Timer(MS * 10, () {
+      countDown(2);
+      completer2.complete(37);
+    });
+    return completer2.future;
+  }).then((v) {
+    Expect.fail("should fail async");
+  }, onError: (error) {
+    Expect.equals("Error", error);
+    countDown(1);
+  });
+
+  completer.completeError("Error");
+}
+
+void testFutureWhenErrorFutureError() {
+  asyncStart();
+  int counter = 3;
+  countDown(int expect) {
+    Expect.equals(expect, counter);
+    if (--counter == 0) asyncEnd();
+  }
+
+  var completer = new Completer();
+  completer.future.whenComplete(() {
+    countDown(3);
+    var completer2 = new Completer();
+    new Timer(MS * 10, () {
+      countDown(2);
+      completer2.completeError("Fail");
+    });
+    return completer2.future;
+  }).then((v) {
+    Expect.fail("should fail async");
+  }, onError: (error) {
+    Expect.equals("Fail", error);
+    countDown(1);
+  });
+
+  completer.completeError("Error");
+}
+
+void testFutureThenThrowsAsync() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  int error = 42;
+
+  asyncStart();
+  future.then((v) {
+    throw error;
+  }).catchError((e) {
+    Expect.identical(error, e);
+    asyncEnd();
+  });
+  completer.complete(0);
+}
+
+void testFutureCatchThrowsAsync() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  int error = 42;
+
+  asyncStart();
+  future.catchError((e) {
+    throw error;
+  }).catchError((e) {
+    Expect.identical(error, e);
+    asyncEnd();
+  });
+  completer.completeError(0);
+}
+
+void testFutureCatchRethrowsAsync() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  var error;
+
+  asyncStart();
+  future.catchError((e) {
+    error = e;
+    throw e;
+  }).catchError((e) {
+    Expect.identical(error, e);
+    asyncEnd();
+  });
+  completer.completeError(0);
+}
+
+void testFutureWhenThrowsAsync() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  var error = 42;
+
+  asyncStart();
+  future.whenComplete(() {
+    throw error;
+  }).catchError((e) {
+    Expect.identical(error, e);
+    asyncEnd();
+  });
+  completer.complete(0);
+}
+
+void testCompleteWithError() {
+  final completer = new Completer<int>();
+  final future = completer.future;
+  var error = 42;
+
+  asyncStart();
+  future.catchError((e) {
+    Expect.identical(error, e);
+    asyncEnd();
+  });
+
+  completer.completeError(error);
+}
+
+void testCompleteWithFutureSuccess() {
+  asyncStart();
+  final completer = new Completer<int>();
+  final completer2 = new Completer<int>();
+  completer.complete(completer2.future);
+  completer.future.then((v) {
+    Expect.equals(42, v);
+    asyncEnd();
+  });
+  completer2.complete(42);
+}
+
+void testCompleteWithFutureSuccess2() {
+  asyncStart();
+  final completer = new Completer<int>();
+  Future result = new Future.value(42);
+  completer.complete(result);
+  completer.future.then((v) {
+    Expect.equals(42, v);
+    asyncEnd();
+  });
+}
+
+void testCompleteWithFutureError() {
+  asyncStart();
+  final completer = new Completer<int>();
+  final completer2 = new Completer<int>();
+  completer.complete(completer2.future);
+  completer.future.then((v) {
+    Expect.fail("Should not happen");
+    asyncEnd();
+  }, onError: (e) {
+    Expect.equals("ERROR-tcwfe", e);
+    asyncEnd();
+  });
+  completer2.completeError("ERROR-tcwfe");
+}
+
+void testCompleteWithFutureError2() {
+  asyncStart();
+  final completer = new Completer<int>();
+  Future result = new Future.error("ERROR-tcwfe2");
+  completer.complete(result);
+  completer.future.then((v) {
+    Expect.fail("Should not happen");
+    asyncEnd();
+  }, onError: (e) {
+    Expect.equals("ERROR-tcwfe2", e);
+    asyncEnd();
+  });
+}
+
+void testCompleteErrorWithFuture() {
+  asyncStart();
+  final completer = new Completer<int>();
+  completer.completeError(new Future.value(42));
+  completer.future.then((_) {
+    Expect.fail("Shouldn't happen");
+  }, onError: (e, s) {
+    Future f = e;
+    f.then((v) {
+      Expect.equals(42, v);
+      asyncEnd();
+    });
+  });
+}
+
+void testCompleteWithCustomFutureSuccess() {
+  asyncStart();
+  final completer = new Completer<int>();
+  final completer2 = new Completer<int>();
+  completer.complete(new CustomFuture(completer2.future));
+  completer.future.then((v) {
+    Expect.equals(42, v);
+    asyncEnd();
+  });
+  completer2.complete(42);
+}
+
+void testCompleteWithCustomFutureError() {
+  asyncStart();
+  final completer = new Completer<int>();
+  final completer2 = new Completer<int>();
+  completer.complete(new CustomFuture(completer2.future));
+  completer.future.then((v) {
+    Expect.fail("Should not happen");
+    asyncEnd();
+  }, onError: (e) {
+    Expect.equals("ERROR-tcwcfe", e);
+    asyncEnd();
+  });
+  completer2.completeError("ERROR-tcwcfe");
+}
+
+void testCompleteErrorWithCustomFuture() {
+  asyncStart();
+  final completer = new Completer<int>();
+  var future = new CustomFuture(new Future.value(42));
+  completer.completeError(future);
+  completer.future.then((_) {
+    Expect.fail("Shouldn't happen");
+  }, onError: (Future f) {
+    f.then((v) {
+      Expect.equals(42, v);
+      asyncEnd();
+    });
+  });
+}
+
+void testCompleteErrorWithNull() {
+  asyncStart();
+  final completer = new Completer<int>();
+  completer.future.catchError((e) {
+    Expect.isTrue(e is NullThrownError);
+    asyncEnd();
+  });
+  completer.completeError(null);
+}
+
+void testChainedFutureValue() {
+  final completer = new Completer();
+  final future = completer.future;
+  asyncStart();
+
+  future.then((v) => new Future.value(v * 2)).then((v) {
+    Expect.equals(42, v);
+    asyncEnd();
+  });
+  completer.complete(21);
+}
+
+void testChainedFutureValueDelay() {
+  final completer = new Completer();
+  final future = completer.future;
+  asyncStart();
+
+  future
+      .then((v) =>
+          new Future.delayed(const Duration(milliseconds: 10), () => v * 2))
+      .then((v) {
+    Expect.equals(42, v);
+    asyncEnd();
+  });
+  completer.complete(21);
+}
+
+void testChainedFutureValue2Delay() {
+  asyncStart();
+
+  new Future.delayed(const Duration(milliseconds: 10)).then((v) {
+    Expect.isNull(v);
+    asyncEnd();
+  });
+}
+
+void testChainedFutureError() {
+  final completer = new Completer();
+  final future = completer.future;
+  asyncStart();
+
+  future.then((v) => new Future.error("Fehler")).then((v) {
+    Expect.fail("unreachable!");
+  }, onError: (error) {
+    Expect.equals("Fehler", error);
+    asyncEnd();
+  });
+  completer.complete(21);
+}
+
+void testSyncFuture_i13368() {
+  asyncStart();
+
+  final future = new Future<int>.sync(() {
+    return new Future<int>.value(42);
+  });
+
+  future.then((int val) {
+    Expect.equals(val, 42);
+    asyncEnd();
+  });
+}
+
+void testWaitCleanUp() {
+  asyncStart();
+  // Creates three futures with different completion times, and where some fail.
+  // The `mask` specifies which futures fail (values 1-7),
+  // and `permute` defines the order of completion. values 0-5.
+  void doTest(int mask, int permute) {
+    asyncStart();
+    String stringId = "waitCleanup-$mask-$permute";
+    List futures = new List(3);
+    List cleanup = new List(3);
+    int permuteTmp = permute;
+    for (int i = 0; i < 3; i++) {
+      bool throws = (mask & (1 << i)) != 0;
+      var future = new Future.delayed(new Duration(milliseconds: 100 * (i + 1)),
+          () => (throws ? throw "Error $i($mask-$permute)" : i));
+      int mod = 3 - i;
+      int position = permuteTmp % mod;
+      permuteTmp = permuteTmp ~/ mod;
+      while (futures[position] != null) position++;
+      futures[position] = future;
+      cleanup[i] = throws;
+    }
+    void cleanUp(index) {
+      Expect.isFalse(cleanup[index]);
+      cleanup[index] = true;
+    }
+
+    Future.wait(futures, cleanUp: cleanUp).then((_) {
+      Expect.fail("No error: $stringId");
+    }, onError: (e, s) {
+      Expect.listEquals([true, true, true], cleanup);
+      asyncEnd();
+    });
+  }
+
+  for (int i = 1; i < 8; i++) {
+    for (int j = 0; j < 6; j++) {
+      doTest(i, j);
+    }
+  }
+  asyncEnd();
+}
+
+void testWaitCleanUpEager() {
+  asyncStart();
+  // Creates three futures with different completion times, and where some fail.
+  // The `mask` specifies which futures fail (values 1-7),
+  // and `permute` defines the order of completion. values 0-5.
+  void doTest(int mask, int permute) {
+    asyncStart();
+    asyncStart();
+    bool done = false;
+    String stringId = "waitCleanup-$mask-$permute";
+    List futures = new List(3);
+    List cleanup = new List(3);
+    int permuteTmp = permute;
+    for (int i = 0; i < 3; i++) {
+      bool throws = (mask & (1 << i)) != 0;
+      var future = new Future.delayed(new Duration(milliseconds: 100 * (i + 1)),
+          () => (throws ? throw "Error $i($mask-$permute)" : i));
+      int mod = 3 - i;
+      int position = permuteTmp % mod;
+      permuteTmp = permuteTmp ~/ mod;
+      while (futures[position] != null) position++;
+      futures[position] = future;
+      cleanup[i] = throws;
+    }
+    void checkDone() {
+      if (done) return;
+      if (cleanup.every((v) => v)) {
+        done = true;
+        asyncEnd();
+      }
+    }
+
+    void cleanUp(index) {
+      Expect.isFalse(cleanup[index]);
+      cleanup[index] = true;
+      // Cleanup might happen before and after the wait().then() callback.
+      checkDone();
+    }
+
+    Future.wait(futures, eagerError: true, cleanUp: cleanUp).then((_) {
+      Expect.fail("No error: $stringId");
+    }, onError: (e, s) {
+      asyncEnd();
+      checkDone();
+    });
+  }
+
+  for (int i = 1; i < 8; i++) {
+    for (int j = 0; j < 6; j++) {
+      doTest(i, j);
+    }
+  }
+  asyncEnd();
+}
+
+void testWaitCleanUpError() {
+  var cms = const Duration(milliseconds: 100);
+  var cleanups = new List.filled(3, false);
+  var uncaughts = new List.filled(3, false);
+  asyncStart();
+  asyncStart();
+  asyncStart();
+  runZoned(() {
+    Future.wait([
+      new Future.delayed(cms, () => 0),
+      new Future.delayed(cms * 2, () => throw 1),
+      new Future.delayed(cms * 3, () => 2)
+    ], cleanUp: (index) {
+      Expect.isTrue(index == 0 || index == 2, "$index");
+      Expect.isFalse(cleanups[index]);
+      cleanups[index] = true;
+      throw index;
+    }).catchError((e) {
+      Expect.equals(e, 1);
+      asyncEnd();
+    });
+  }, onError: (int index, s) {
+    Expect.isTrue(index == 0 || index == 2, "$index");
+    Expect.isFalse(uncaughts[index]);
+    uncaughts[index] = true;
+    asyncEnd();
+  });
+}
+
+void testWaitSyncError() {
+  var cms = const Duration(milliseconds: 100);
+  var cleanups = new List.filled(3, false);
+  asyncStart();
+  asyncStart();
+  runZoned(() {
+    Future.wait(
+        new Iterable.generate(5, (i) {
+          if (i != 3) return new Future.delayed(cms * (i + 1), () => i);
+          throw "throwing synchronously in iterable";
+        }), cleanUp: (index) {
+      Expect.isFalse(cleanups[index]);
+      cleanups[index] = true;
+      if (cleanups.every((x) => x)) asyncEnd();
+    });
+  }, onError: (e, s) {
+    asyncEnd();
+  });
+}
+
+void testWaitSyncError2() {
+  asyncStart();
+  Future.wait([null]).catchError((e, st) {
+    // Makes sure that the `catchError` is invoked.
+    // Regression test: an earlier version of `Future.wait` would propagate
+    // the error too soon for the code to install an error handler.
+    // `testWaitSyncError` didn't show this problem, because the `runZoned`
+    // was already installed.
+    asyncEnd();
+  });
+}
+
+// Future.wait transforms synchronous errors into asynchronous ones.
+// This function tests that zones can intercept them.
+void testWaitSyncError3() {
+  var caughtError;
+  var count = 0;
+
+  AsyncError errorCallback(Zone self, ZoneDelegate parent, Zone zone,
+      Object error, StackTrace stackTrace) {
+    Expect.equals(0, count);
+    count++;
+    caughtError = error;
+    return parent.errorCallback(zone, error, stackTrace);
+  }
+
+  asyncStart();
+  runZoned(() {
+    Future.wait([null]).catchError((e, st) {
+      Expect.identical(e, caughtError);
+      Expect.equals(1, count);
+      asyncEnd();
+    });
+  }, zoneSpecification: new ZoneSpecification(errorCallback: errorCallback));
+}
+
+void testBadFuture() {
+  var bad = new BadFuture();
+  // Completing with bad future (then call throws) puts error in result.
+  asyncStart();
+  Completer completer = new Completer();
+  completer.complete(bad);
+  completer.future.then((_) {
+    Expect.fail("unreachable");
+  }, onError: (e, s) {
+    Expect.isTrue(completer.isCompleted);
+    asyncEnd();
+  });
+
+  asyncStart();
+  var f = new Future.value().then((_) => bad);
+  f.then((_) {
+    Expect.fail("unreachable");
+  }, onError: (e, s) {
+    asyncEnd();
+  });
+}
+
+void testTypes() {
+  // Test that future is a Future<int> and not something less precise.
+  testType(name, future, [depth = 2]) {
+    var desc = "$name${".whenComplete"*(2-depth)}";
+    Expect.isTrue(future is Future<int>, "$desc is Future<int>");
+    Expect.isFalse(future is Future<String>, "$desc is! Future<String>");
+    var stream = future.asStream();
+    Expect.isTrue(stream is Stream<int>, "$desc.asStream() is Stream<int>");
+    Expect.isFalse(
+        stream is Stream<String>, "$desc.asStream() is! Stream<String>");
+    if (depth > 0) {
+      testType(name, future.whenComplete(() {}), depth - 1);
+    }
+  }
+
+  for (var value in [42, null]) {
+    testType("Future($value)", new Future<int>(() => value));
+    testType("Future.delayed($value)",
+        new Future<int>.delayed(Duration.ZERO, () => value));
+    testType(
+        "Future.microtask($value)", new Future<int>.microtask(() => value));
+    testType("Future.sync($value)", new Future<int>.sync(() => value)); //# 01: ok
+    testType("Future.sync(future($value))", //                          //# 01: continued
+             new Future<int>.sync(() => new Future<int>.value(value))); //# 01: continued
+    testType("Future.value($value)", new Future<int>.value(value));
+  }
+  testType("Completer.future", new Completer<int>().future);
+  testType("Future.error", new Future<int>.error("ERR")..catchError((_) {}));
+}
+
+void testAnyValue() {
+  asyncStart();
+  var cs = new List.generate(3, (_) => new Completer());
+  var result = Future.any(cs.map((x) => x.future));
+
+  result.then((v) {
+    Expect.equals(42, v);
+    asyncEnd();
+  }, onError: (e, s) {
+    Expect.fail("Unexpected error: $e");
+  });
+
+  cs[1].complete(42);
+  cs[2].complete(10);
+  cs[0].complete(20);
+}
+
+void testAnyError() {
+  asyncStart();
+  var cs = new List.generate(3, (_) => new Completer());
+  var result = Future.any(cs.map((x) => x.future));
+
+  result.then((v) {
+    Expect.fail("Unexpected value: $v");
+  }, onError: (e, s) {
+    Expect.equals(42, e);
+    asyncEnd();
+  });
+
+  cs[1].completeError(42);
+  cs[2].complete(10);
+  cs[0].complete(20);
+}
+
+void testAnyIgnoreIncomplete() {
+  asyncStart();
+  var cs = new List.generate(3, (_) => new Completer());
+  var result = Future.any(cs.map((x) => x.future));
+
+  result.then((v) {
+    Expect.equals(42, v);
+    asyncEnd();
+  }, onError: (e, s) {
+    Expect.fail("Unexpected error: $e");
+  });
+
+  cs[1].complete(42);
+  // The other two futures never complete.
+}
+
+void testAnyIgnoreError() {
+  asyncStart();
+  var cs = new List.generate(3, (_) => new Completer());
+  var result = Future.any(cs.map((x) => x.future));
+
+  result.then((v) {
+    Expect.equals(42, v);
+    asyncEnd();
+  }, onError: (e, s) {
+    Expect.fail("Unexpected error: $e");
+  });
+
+  cs[1].complete(42);
+  // The errors are ignored, not uncaught.
+  cs[2].completeError("BAD");
+  cs[0].completeError("BAD");
+}
+
+void testFutureResult() {
+  asyncStart();
+  () async {
+    var f = new UglyFuture(5);
+    // Sanity check that our future is as mis-behaved as we think.
+    f.then((v) {
+      Expect.isTrue(v is Future);
+    });
+
+    var v = await f;
+    // The static type of await is Flatten(static-type-of-expression), so it
+    // suggests that it flattens. In practice it currently doesn't.
+    // The specification doesn't say anything special, so v should be the
+    // completion value of the UglyFuture future which is a future.
+    Expect.isTrue(v is Future);
+
+    // This used to hit an assert in checked mode.
+    // The CL adding this test changed the behavior to actually flatten the
+    // the future returned by the then-callback.
+    var w = new Future.value(42).then((_) => f);
+    Expect.equals(42, await w);
+    asyncEnd();
+  }();
+}
+
+main() {
+  asyncStart();
+
+  testValue();
+  testSync();
+  testNeverComplete();
+
+  testComplete();
+  testCompleteWithSuccessHandlerBeforeComplete();
+  testCompleteWithSuccessHandlerAfterComplete();
+  testCompleteManySuccessHandlers();
+  testCompleteWithError();
+
+  testCompleteWithFutureSuccess();
+  testCompleteWithFutureSuccess2();
+  testCompleteWithFutureError();
+  testCompleteWithFutureError2();
+  testCompleteErrorWithFuture();
+  testCompleteWithCustomFutureSuccess();
+  testCompleteWithCustomFutureError();
+  testCompleteErrorWithCustomFuture();
+  testCompleteErrorWithNull();
+
+  testException();
+  testExceptionHandler();
+  testExceptionHandlerReturnsTrue();
+  testExceptionHandlerReturnsTrue2();
+  testExceptionHandlerReturnsFalse();
+
+  testFutureAsStreamCompleteAfter();
+  testFutureAsStreamCompleteBefore();
+  testFutureAsStreamCompleteImmediate();
+  testFutureAsStreamCompleteErrorAfter();
+  testFutureAsStreamWrapper();
+
+  testFutureWhenCompleteValue();
+  testFutureWhenCompleteError();
+  testFutureWhenCompleteValueNewError();
+  testFutureWhenCompleteErrorNewError();
+
+  testFutureWhenValueFutureValue();
+  testFutureWhenErrorFutureValue();
+  testFutureWhenValueFutureError();
+  testFutureWhenErrorFutureError();
+
+  testFutureThenThrowsAsync();
+  testFutureCatchThrowsAsync();
+  testFutureWhenThrowsAsync();
+  testFutureCatchRethrowsAsync();
+
+  testChainedFutureValue();
+  testChainedFutureValueDelay();
+  testChainedFutureError();
+
+  testSyncFuture_i13368();
+
+  testWaitCleanUp();
+  testWaitCleanUpError();
+  testWaitSyncError();
+  testWaitSyncError2();
+  testWaitSyncError3();
+
+  testBadFuture();
+
+  testTypes();
+
+  testAnyValue();
+  testAnyError();
+  testAnyIgnoreIncomplete();
+  testAnyIgnoreError();
+
+  testFutureResult();
+
+  asyncEnd();
+}
+
+/// A well-behaved Future that isn't recognizable as a _Future.
+class CustomFuture<T> implements Future<T> {
+  Future _realFuture;
+  CustomFuture(this._realFuture);
+  Future then(action(result), {Function onError}) =>
+      _realFuture.then(action, onError: onError);
+  Future catchError(Function onError, {bool test(e)}) =>
+      _realFuture.catchError(onError, test: test);
+  Future whenComplete(action()) => _realFuture.whenComplete(action);
+  Future timeout(Duration timeLimit, {void onTimeout()}) =>
+      _realFuture.timeout(timeLimit, onTimeout: onTimeout);
+  Stream asStream() => _realFuture.asStream();
+  String toString() => "CustomFuture@${_realFuture.hashCode}";
+  int get hashCode => _realFuture.hashCode;
+}
+
+/// A bad future that throws on every method.
+class BadFuture<T> implements Future<T> {
+  Future then(action(T result), {Function onError}) {
+    throw "then GOTCHA!";
+  }
+
+  Future catchError(Function onError, {bool test(e)}) {
+    throw "catch GOTCHA!";
+  }
+
+  Future whenComplete(action()) {
+    throw "finally GOTCHA!";
+  }
+
+  Stream<T> asStream() {
+    throw "asStream GOTCHA!";
+  }
+
+  Future timeout(Duration duration, {onTimeout()}) {
+    throw "timeout GOTCHA!";
+  }
+}
+
+// An evil future that completes with another future.
+class UglyFuture implements Future<dynamic> {
+  final _result;
+  UglyFuture(int badness)
+      : _result = (badness == 0) ? 42 : new UglyFuture(badness - 1);
+  Future then(action(value), {onError(error, StackTrace stack)}) {
+    var c = new Completer();
+    c.complete(new Future.microtask(() => action(_result)));
+    return c.future;
+  }
+
+  Future catchError(onError, {test}) => this; // Never an error.
+  Future whenComplete(action()) {
+    return new Future.microtask(action).then((_) => this);
+  }
+
+  Stream asStream() {
+    return (new StreamController()
+          ..add(_result)
+          ..close())
+        .stream;
+  }
+
+  Future timeout(Duration duration, {onTimeout()}) {
+    return this;
+  }
+}