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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 // A helper class used to mock out calls to the static method base::Time::Now. |
| 6 // |
| 7 // Example usage: |
| 8 // |
| 9 // typedef base::Time(TimeProvider)(); |
| 10 // class StopWatch { |
| 11 // public: |
| 12 // StopWatch(TimeProvider* time_provider); |
| 13 // void Start(); |
| 14 // base::TimeDelta Stop(); |
| 15 // private: |
| 16 // TimeProvider* time_provider_; |
| 17 // ... |
| 18 // } |
| 19 // |
| 20 // Normally, you would instantiate a StopWatch with the real Now function: |
| 21 // |
| 22 // StopWatch watch(&base::Time::Now); |
| 23 // |
| 24 // But when testing, you want to instantiate it with |
| 25 // MockTimeProvider::StaticNow, which calls an internally mocked out member. |
| 26 // This allows you to set expectations on the Now method. For example: |
| 27 // |
| 28 // TEST_F(StopWatchTest, BasicTest) { |
| 29 // InSequence s; |
| 30 // StrictMock<MockTimeProvider> mock_time; |
| 31 // EXPECT_CALL(mock_time, Now()) |
| 32 // .WillOnce(Return(Time::FromDoubleT(4))); |
| 33 // EXPECT_CALL(mock_time, Now()) |
| 34 // .WillOnce(Return(Time::FromDoubleT(10))); |
| 35 // |
| 36 // StopWatch sw(&MockTimeProvider::StaticNow); |
| 37 // sw.Start(); // First call to Now. |
| 38 // TimeDelta elapsed = sw.stop(); // Second call to Now. |
| 39 // ASSERT_EQ(elapsed, TimeDelta::FromSeconds(6)); |
| 40 // } |
| 41 |
| 42 #include "base/time.h" |
| 43 #include "testing/gmock/include/gmock/gmock.h" |
| 44 |
| 45 #ifndef BASE_TEST_MOCK_TIME_PROVIDER_H_ |
| 46 #define BASE_TEST_MOCK_TIME_PROVIDER_H_ |
| 47 |
| 48 namespace base { |
| 49 |
| 50 class MockTimeProvider { |
| 51 public: |
| 52 MockTimeProvider(); |
| 53 ~MockTimeProvider(); |
| 54 |
| 55 MOCK_METHOD0(Now, Time()); |
| 56 |
| 57 static Time StaticNow(); |
| 58 |
| 59 private: |
| 60 static MockTimeProvider* instance_; |
| 61 DISALLOW_COPY_AND_ASSIGN(MockTimeProvider); |
| 62 }; |
| 63 |
| 64 } // namespace base |
| 65 |
| 66 #endif // BASE_TEST_MOCK_TIME_PROVIDER_H_ |
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