test/frontend/expect_test.dart

// Copyright (c) 2017, 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:async';

import 'package:test/test.dart';

import '../utils.dart';

void main() {
  group("returned Future from expectLater()", () {
    test("completes immediately for a sync matcher", () {
      expect(expectLater(true, isTrue), completes);
    });

    test("contains the expect failure", () {
      expect(expectLater(new Future.value(true), completion(isFalse)),
          throwsA(isTestFailure(anything)));
    });

    test("contains an async error", () {
      expect(expectLater(new Future.error("oh no"), completion(isFalse)),
          throwsA("oh no"));
    });
  });

  group("an async matcher that fails synchronously", () {
    test("throws synchronously", () {
      expect(() => expect(() {}, throws), throwsA(isTestFailure(anything)));
    });

    test("can be used with synchronous operators", () {
      expect(() {}, isNot(throws));
    });
  });
}