1 files changed, 37 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/fake_clock_unittest.cc b/third_party/libwebrtc/rtc_base/fake_clock_unittest.cc
new file mode 100644
index 0000000000..fc1d5100e6
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/fake_clock_unittest.cc
@@ -0,0 +1,37 @@
+/*
+ *  Copyright 2019 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rtc_base/fake_clock.h"
+
+#include "test/gtest.h"
+
+namespace rtc {
+TEST(ScopedFakeClockTest, OverridesGlobalClock) {
+  const int64_t kFixedTimeUs = 100000;
+  int64_t real_time_us = rtc::TimeMicros();
+  EXPECT_NE(real_time_us, 0);
+  {
+    ScopedFakeClock scoped;
+    EXPECT_EQ(rtc::TimeMicros(), 0);
+
+    scoped.AdvanceTime(webrtc::TimeDelta::Millis(1));
+    EXPECT_EQ(rtc::TimeMicros(), 1000);
+
+    scoped.SetTime(webrtc::Timestamp::Micros(kFixedTimeUs));
+    EXPECT_EQ(rtc::TimeMicros(), kFixedTimeUs);
+
+    scoped.AdvanceTime(webrtc::TimeDelta::Millis(1));
+    EXPECT_EQ(rtc::TimeMicros(), kFixedTimeUs + 1000);
+  }
+
+  EXPECT_NE(rtc::TimeMicros(), kFixedTimeUs + 1000);
+  EXPECT_GE(rtc::TimeMicros(), real_time_us);
+}
+}  // namespace rtc