1 files changed, 100 insertions, 0 deletions
diff --git a/modules/congestion_controller/remb_throttler_unittest.cc b/modules/congestion_controller/remb_throttler_unittest.cc
new file mode 100644
index 0000000000..3f8df8a7bb
--- /dev/null
+++ b/modules/congestion_controller/remb_throttler_unittest.cc
@@ -0,0 +1,100 @@
+/*
+ *  Copyright (c) 2021 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 "modules/congestion_controller/remb_throttler.h"
+
+#include <vector>
+
+#include "api/units/data_rate.h"
+#include "api/units/time_delta.h"
+#include "system_wrappers/include/clock.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+
+using ::testing::_;
+using ::testing::MockFunction;
+
+TEST(RembThrottlerTest, CallRembSenderOnFirstReceiveBitrateChange) {
+  SimulatedClock clock(Timestamp::Zero());
+  MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
+  RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
+
+  EXPECT_CALL(remb_sender, Call(12345, std::vector<uint32_t>({1, 2, 3})));
+  remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/12345);
+}
+
+TEST(RembThrottlerTest, ThrottlesSmallReceiveBitrateDecrease) {
+  SimulatedClock clock(Timestamp::Zero());
+  MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
+  RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
+
+  EXPECT_CALL(remb_sender, Call);
+  remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/12346);
+  clock.AdvanceTime(TimeDelta::Millis(100));
+  remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/12345);
+
+  EXPECT_CALL(remb_sender, Call(12345, _));
+  clock.AdvanceTime(TimeDelta::Millis(101));
+  remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/12345);
+}
+
+TEST(RembThrottlerTest, DoNotThrottleLargeReceiveBitrateDecrease) {
+  SimulatedClock clock(Timestamp::Zero());
+  MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
+  RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
+
+  EXPECT_CALL(remb_sender, Call(2345, _));
+  EXPECT_CALL(remb_sender, Call(1234, _));
+  remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/2345);
+  clock.AdvanceTime(TimeDelta::Millis(1));
+  remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/1234);
+}
+
+TEST(RembThrottlerTest, ThrottlesReceiveBitrateIncrease) {
+  SimulatedClock clock(Timestamp::Zero());
+  MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
+  RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
+
+  EXPECT_CALL(remb_sender, Call);
+  remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/1234);
+  clock.AdvanceTime(TimeDelta::Millis(100));
+  remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/2345);
+
+  // Updates 200ms after previous callback is not throttled.
+  EXPECT_CALL(remb_sender, Call(2345, _));
+  clock.AdvanceTime(TimeDelta::Millis(101));
+  remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/2345);
+}
+
+TEST(RembThrottlerTest, CallRembSenderOnSetMaxDesiredReceiveBitrate) {
+  SimulatedClock clock(Timestamp::Zero());
+  MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
+  RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
+  EXPECT_CALL(remb_sender, Call(1234, _));
+  remb_throttler.SetMaxDesiredReceiveBitrate(DataRate::BitsPerSec(1234));
+}
+
+TEST(RembThrottlerTest, CallRembSenderWithMinOfMaxDesiredAndOnReceivedBitrate) {
+  SimulatedClock clock(Timestamp::Zero());
+  MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
+  RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
+
+  EXPECT_CALL(remb_sender, Call(1234, _));
+  remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/1234);
+  clock.AdvanceTime(TimeDelta::Millis(1));
+  remb_throttler.SetMaxDesiredReceiveBitrate(DataRate::BitsPerSec(4567));
+
+  clock.AdvanceTime(TimeDelta::Millis(200));
+  EXPECT_CALL(remb_sender, Call(4567, _));
+  remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/5678);
+}
+
+}  // namespace webrtc