Let AutoplayUmaHelper listen to visibilitychange instead of unload

third_party/WebKit/Source/core/html/AutoplayUmaHelperTest.cpp

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/html/AutoplayUmaHelper.h"
+
+#include "core/dom/Document.h"
+#include "core/html/HTMLMediaElement.h"
+#include "core/html/HTMLVideoElement.h"
+#include "core/testing/DummyPageHolder.h"
+
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+using ::testing::Invoke;
+
+class MockAutoplayUmaHelper : public AutoplayUmaHelper {
+ public:
+  MockAutoplayUmaHelper(HTMLMediaElement* element)
+      : AutoplayUmaHelper(element) {
+    ON_CALL(*this, handleContextDestroyed())
+        .WillByDefault(
+            Invoke(this, &MockAutoplayUmaHelper::reallyHandleContextDestroyed));
+  }
+
+  void handlePlayingEvent() { AutoplayUmaHelper::handlePlayingEvent(); }
+
+  MOCK_METHOD0(handleContextDestroyed, void());
+
+  // Making this a wrapper function to avoid calling the mocked version.
+  void reallyHandleContextDestroyed() {
+    AutoplayUmaHelper::handleContextDestroyed();
+  }
+};
+
+class AutoplayUmaHelperTest : public testing::Test {
+ protected:
+  Document& document() { return m_pageHolder->document(); }
+
+  HTMLMediaElement& mediaElement() {
+    Element* element = document().getElementById("video");
+    DCHECK(element);
+    return toHTMLVideoElement(*element);
+  }
+
+  MockAutoplayUmaHelper& umaHelper() {
+    return *(static_cast<MockAutoplayUmaHelper*>(
+        mediaElement().m_autoplayUmaHelper.get()));
+  }
+
+  std::unique_ptr<DummyPageHolder>& pageHolder() { return m_pageHolder; }
+
+  MOCK_METHOD0(TestEnded, void());
+
+ private:
+  void SetUp() override {
+    m_pageHolder = DummyPageHolder::create(IntSize(800, 600));
+    document().documentElement()->setInnerHTML("<video id=video></video>",
+                                               ASSERT_NO_EXCEPTION);
+    HTMLMediaElement& element = mediaElement();
+    element.m_autoplayUmaHelper = new MockAutoplayUmaHelper(&element);
+  }
+
+  std::unique_ptr<DummyPageHolder> m_pageHolder;
+};
+
+TEST_F(AutoplayUmaHelperTest, VisibilityChangeWhenUnload) {
+  // This is to avoid handleContextDestroyed() to be called during TearDown().
+  EXPECT_CALL(*this, TestEnded())
+      .After(EXPECT_CALL(umaHelper(), handleContextDestroyed()));
+
+  mediaElement().setMuted(true);
+  umaHelper().onAutoplayInitiated(AutoplaySource::Attribute);
+  umaHelper().handlePlayingEvent();
+  pageHolder().reset();
+  TestEnded();
+}
+
+}  // namespace blink