Introduce helper class NtpTime

webrtc/modules/rtp_rtcp/source/ntp_time_unittest.cc

+/*
+ *  Copyright (c) 2014 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 "testing/gtest/include/gtest/gtest.h"
+
+#include "webrtc/modules/rtp_rtcp/source/ntp_time.h"
+
+namespace webrtc {
+namespace rtcp {
+namespace {
+
+const uint32_t kNtpSec = 0x12345678;
+const uint32_t kNtpFrac = 0x23456789;
+const uint32_t kNtpMid = 0x56782345;
+
+TEST(NtpTimeTest, NoValue) {
+  NtpTime ntp;
+  EXPECT_FALSE(ntp.Valid());
+}
+
+TEST(NtpTimeTest, CanResetValue) {
+  NtpTime ntp(kNtpSec, kNtpFrac);
+  EXPECT_TRUE(ntp.Valid());
+  ntp.Reset();
+  EXPECT_FALSE(ntp.Valid());
+}
+
+TEST(NtpTimeTest, MidNtp) {
+  EXPECT_EQ(kNtpMid, NtpTime(kNtpSec, kNtpFrac).MidNtp());
+}
+
+TEST(NtpTimeTest, CanGetWhatIsSet) {
+  NtpTime ntp;
+  ntp.Set(kNtpSec, kNtpFrac);
+  EXPECT_EQ(kNtpSec, ntp.seconds());
+  EXPECT_EQ(kNtpFrac, ntp.fractions());
+}
+
+TEST(NtpTimeTest, SetIsSameAs2ParameterConstructor) {
+  NtpTime ntp1(kNtpSec, kNtpFrac);
+  NtpTime ntp2;
+  EXPECT_NE(ntp1, ntp2);
+
+  ntp2.Set(kNtpSec, kNtpFrac);
+  EXPECT_EQ(ntp1, ntp2);
+}
+
+TEST(NtpTimeTest, SetCurrentIsSameAs1ParameterConstructor) {
+  SimulatedClock clock(0x0123456789abcdef);
+
+  NtpTime ntp1(clock);
+  NtpTime ntp2;
+  EXPECT_NE(ntp1, ntp2);
+
+  ntp2.SetCurrent(clock);
+  EXPECT_EQ(ntp1, ntp2);
+}
+
+TEST(NtpTimeTest, ToMsMeansToNtpMilliseconds) {
+  SimulatedClock clock(0x123456789abc);
+
+  NtpTime ntp(clock);
+  EXPECT_EQ(ntp.ToMs(), Clock::NtpToMs(ntp.seconds(), ntp.fractions()));
+  EXPECT_EQ(ntp.ToMs(), clock.CurrentNtpInMilliseconds());
+}
+
+}  // namespace
+}  // namespace rtcp
+}  // namespace webrtc