1 /*
2  *  Copyright 2019 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #include "rtc_base/fake_clock.h"
12 
13 #include "test/gtest.h"
14 
15 namespace rtc {
TEST(ScopedFakeClockTest,OverridesGlobalClock)16 TEST(ScopedFakeClockTest, OverridesGlobalClock) {
17   const int64_t kFixedTimeUs = 100000;
18   int64_t real_time_us = rtc::TimeMicros();
19   EXPECT_NE(real_time_us, 0);
20   {
21     ScopedFakeClock scoped;
22     EXPECT_EQ(rtc::TimeMicros(), 0);
23 
24     scoped.AdvanceTime(webrtc::TimeDelta::Millis(1));
25     EXPECT_EQ(rtc::TimeMicros(), 1000);
26 
27     scoped.SetTime(webrtc::Timestamp::Micros(kFixedTimeUs));
28     EXPECT_EQ(rtc::TimeMicros(), kFixedTimeUs);
29 
30     scoped.AdvanceTime(webrtc::TimeDelta::Millis(1));
31     EXPECT_EQ(rtc::TimeMicros(), kFixedTimeUs + 1000);
32   }
33 
34   EXPECT_NE(rtc::TimeMicros(), kFixedTimeUs + 1000);
35   EXPECT_GE(rtc::TimeMicros(), real_time_us);
36 }
37 }  // namespace rtc
38