1 files changed, 34 insertions, 0 deletions
diff --git a/third_party/libwebrtc/system_wrappers/source/clock_unittest.cc b/third_party/libwebrtc/system_wrappers/source/clock_unittest.cc
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index 0000000000..f7b0ed7a47
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+++ b/third_party/libwebrtc/system_wrappers/source/clock_unittest.cc
@@ -0,0 +1,34 @@
+/*
+ *  Copyright (c) 2012 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 "system_wrappers/include/clock.h"
+
+#include "test/gtest.h"
+
+namespace webrtc {
+
+TEST(ClockTest, NtpTime) {
+  Clock* clock = Clock::GetRealTimeClock();
+
+  // To ensure the test runs correctly even on a heavily loaded system, do not
+  // compare the seconds/fractions and millisecond values directly. Instead,
+  // we check that the NTP time is between the "milliseconds" values returned
+  // right before and right after the call.
+  // The comparison includes 1 ms of margin to account for the rounding error in
+  // the conversion.
+  int64_t milliseconds_lower_bound = clock->CurrentNtpInMilliseconds();
+  NtpTime ntp_time = clock->CurrentNtpTime();
+  int64_t milliseconds_upper_bound = clock->CurrentNtpInMilliseconds();
+  EXPECT_GT(milliseconds_lower_bound / 1000, kNtpJan1970);
+  EXPECT_LE(milliseconds_lower_bound - 1, ntp_time.ToMs());
+  EXPECT_GE(milliseconds_upper_bound + 1, ntp_time.ToMs());
+}
+
+}  // namespace webrtc