1 files changed, 90 insertions, 0 deletions
diff --git a/third_party/libwebrtc/test/pc/e2e/stats_poller_test.cc b/third_party/libwebrtc/test/pc/e2e/stats_poller_test.cc
new file mode 100644
index 0000000000..02a323127b
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+++ b/third_party/libwebrtc/test/pc/e2e/stats_poller_test.cc
@@ -0,0 +1,90 @@
+/*
+ *  Copyright (c) 2022 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 "test/pc/e2e/stats_poller.h"
+
+#include "api/stats/rtc_stats_collector_callback.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace webrtc_pc_e2e {
+namespace {
+
+using ::testing::Eq;
+
+class TestStatsProvider : public StatsProvider {
+ public:
+  ~TestStatsProvider() override = default;
+
+  void GetStats(RTCStatsCollectorCallback* callback) override {
+    stats_collections_count_++;
+  }
+
+  int stats_collections_count() const { return stats_collections_count_; }
+
+ private:
+  int stats_collections_count_ = 0;
+};
+
+class MockStatsObserver : public StatsObserverInterface {
+ public:
+  ~MockStatsObserver() override = default;
+
+  MOCK_METHOD(void,
+              OnStatsReports,
+              (absl::string_view pc_label,
+               const rtc::scoped_refptr<const RTCStatsReport>& report));
+};
+
+TEST(StatsPollerTest, UnregisterParticipantAddedInCtor) {
+  TestStatsProvider alice;
+  TestStatsProvider bob;
+
+  MockStatsObserver stats_observer;
+
+  StatsPoller poller(/*observers=*/{&stats_observer},
+                     /*peers_to_observe=*/{{"alice", &alice}, {"bob", &bob}});
+  poller.PollStatsAndNotifyObservers();
+
+  EXPECT_THAT(alice.stats_collections_count(), Eq(1));
+  EXPECT_THAT(bob.stats_collections_count(), Eq(1));
+
+  poller.UnregisterParticipantInCall("bob");
+  poller.PollStatsAndNotifyObservers();
+
+  EXPECT_THAT(alice.stats_collections_count(), Eq(2));
+  EXPECT_THAT(bob.stats_collections_count(), Eq(1));
+}
+
+TEST(StatsPollerTest, UnregisterParticipantRegisteredInCall) {
+  TestStatsProvider alice;
+  TestStatsProvider bob;
+
+  MockStatsObserver stats_observer;
+
+  StatsPoller poller(/*observers=*/{&stats_observer},
+                     /*peers_to_observe=*/{{"alice", &alice}});
+  poller.RegisterParticipantInCall("bob", &bob);
+  poller.PollStatsAndNotifyObservers();
+
+  EXPECT_THAT(alice.stats_collections_count(), Eq(1));
+  EXPECT_THAT(bob.stats_collections_count(), Eq(1));
+
+  poller.UnregisterParticipantInCall("bob");
+  poller.PollStatsAndNotifyObservers();
+
+  EXPECT_THAT(alice.stats_collections_count(), Eq(2));
+  EXPECT_THAT(bob.stats_collections_count(), Eq(1));
+}
+
+}  // namespace
+}  // namespace webrtc_pc_e2e
+}  // namespace webrtc