[Chromoting] Unit Tests for GlRenderer

remoting/client/gl_renderer_unittest.cc

Index: remoting/client/gl_renderer_unittest.cc
diff --git a/remoting/client/gl_renderer_unittest.cc b/remoting/client/gl_renderer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..182a2dc2c6df0ad95cba0d53d31a9a65f0e0e80d
--- /dev/null
+++ b/remoting/client/gl_renderer_unittest.cc
@@ -0,0 +1,220 @@
+// 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 "remoting/client/gl_renderer.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/memory/ptr_util.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "remoting/client/gl_renderer_delegate.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
+
+namespace remoting {
+
+class FakeGlRendererDelegate : public GlRendererDelegate {
+ public:
+  FakeGlRendererDelegate() : weak_factory_(this) {}
+
+  bool CanRenderFrame() override {
+    can_render_frame_call_count_++;
+    return can_render_frame_;
+  }
+
+  void OnFrameRendered() override {
+    on_frame_rendered_call_count_++;
+    if (on_frame_rendered_callback_) {
+      on_frame_rendered_callback_.Run();
+    }
+  }
+
+  void OnSizeChanged(int width, int height) override {
+    canvas_width_ = width;
+    canvas_height_ = height;
+    on_size_changed_call_count_++;
+  }
+
+  void SetOnFrameRenderedCallback(const base::Closure& callback) {
+    on_frame_rendered_callback_ = callback;
+  }
+
+  int canvas_width() {
+    return canvas_width_;
+  }
+
+  int canvas_height() {
+    return canvas_height_;
+  }
+
+  base::WeakPtr<FakeGlRendererDelegate> GetWeakPtr() {
+    return weak_factory_.GetWeakPtr();
+  }
+
+  int can_render_frame_call_count() {
+    return can_render_frame_call_count_;
+  }
+
+  int on_frame_rendered_call_count() {
+    return on_frame_rendered_call_count_;
+  }
+
+  int on_size_changed_call_count() {
+    return on_size_changed_call_count_;
+  }
+
+  bool can_render_frame_ = false;
+
+ private:
+  int can_render_frame_call_count_ = 0;
+  int on_frame_rendered_call_count_ = 0;
+  int on_size_changed_call_count_ = 0;
+
+  int canvas_width_ = 0;
+  int canvas_height_ = 0;
+
+  base::Closure on_frame_rendered_callback_;
+
+  base::WeakPtrFactory<FakeGlRendererDelegate> weak_factory_;
+};
+
+class GlRendererTest : public testing::Test {
+ public:
+  void SetUp() override;
+  void SetDesktopFrameWithSize(const webrtc::DesktopSize& size);
+  void PostSetDesktopFrameTasks(const webrtc::DesktopSize& size, int count);
+
+ protected:
+  void RequestRender();
+  void OnDesktopFrameProcessed();
+  void RunTasksInCurrentQueue();
+  void RunUntilRendered();
+  int on_desktop_frame_processed_call_count() {
+    return on_desktop_frame_processed_call_count_;
+  }
+
+  base::MessageLoop message_loop_;
+  std::unique_ptr<GlRenderer> renderer_;
+  FakeGlRendererDelegate delegate_;
+
+ private:
+  int on_desktop_frame_processed_call_count_ = 0;
+};
+
+void GlRendererTest::SetUp() {
+  renderer_.reset(new GlRenderer());
+  renderer_->SetDelegate(delegate_.GetWeakPtr());
+}
+
+void GlRendererTest::RequestRender() {
+  renderer_->RequestRender();
+}
+
+void GlRendererTest::SetDesktopFrameWithSize(const webrtc::DesktopSize& size) {
+  renderer_->OnFrameReceived(
+      base::WrapUnique(
+          new webrtc::BasicDesktopFrame(size)),
+      base::Bind(&GlRendererTest::OnDesktopFrameProcessed,
+                 base::Unretained(this)));
+}
+
+void GlRendererTest::PostSetDesktopFrameTasks(
+    const webrtc::DesktopSize& size, int count) {
+  for (int i = 0; i < count; i++) {
+    message_loop_.task_runner()->PostTask(
+        FROM_HERE, base::Bind(&GlRendererTest::SetDesktopFrameWithSize,
+                              base::Unretained(this), size));
+  }
+}
+
+void GlRendererTest::OnDesktopFrameProcessed() {
+  on_desktop_frame_processed_call_count_++;
+}
+
+void GlRendererTest::RunTasksInCurrentQueue() {
+  base::RunLoop run_loop;
+  message_loop_.task_runner()->PostTask(FROM_HERE, run_loop.QuitClosure());
+  run_loop.Run();
+}
+
+void GlRendererTest::RunUntilRendered() {
+  base::RunLoop run_loop;
+  delegate_.SetOnFrameRenderedCallback(run_loop.QuitClosure());
+  run_loop.Run();
+}
+
+
+TEST_F(GlRendererTest, TestDelegateCanRenderFrame) {
+  delegate_.can_render_frame_ = true;
+  RequestRender();
+  RunTasksInCurrentQueue();
+  EXPECT_EQ(1, delegate_.can_render_frame_call_count());
+  EXPECT_EQ(1, delegate_.on_frame_rendered_call_count());
+
+  delegate_.can_render_frame_ = false;
+  RequestRender();
+  RunTasksInCurrentQueue();
+  EXPECT_EQ(2, delegate_.can_render_frame_call_count());
+  EXPECT_EQ(1, delegate_.on_frame_rendered_call_count());
+}
+
+TEST_F(GlRendererTest, TestRequestRenderOnlyScheduleOnce) {
+  delegate_.can_render_frame_ = true;
+
+  RequestRender();
+  RequestRender();
+  RequestRender();
+  RunTasksInCurrentQueue();
+  EXPECT_EQ(1, delegate_.can_render_frame_call_count());
+  EXPECT_EQ(1, delegate_.on_frame_rendered_call_count());
+
+  RequestRender();
+  RunTasksInCurrentQueue();
+  EXPECT_EQ(2, delegate_.can_render_frame_call_count());
+  EXPECT_EQ(2, delegate_.on_frame_rendered_call_count());
+}
+
+TEST_F(GlRendererTest, TestDelegateOnSizeChanged) {
+  SetDesktopFrameWithSize(webrtc::DesktopSize(16, 16));
+  EXPECT_EQ(1, delegate_.on_size_changed_call_count());
+  EXPECT_EQ(16, delegate_.canvas_width());
+  EXPECT_EQ(16, delegate_.canvas_height());
+
+  SetDesktopFrameWithSize(webrtc::DesktopSize(16, 16));
+  EXPECT_EQ(1, delegate_.on_size_changed_call_count());
+  EXPECT_EQ(16, delegate_.canvas_width());
+  EXPECT_EQ(16, delegate_.canvas_height());
+
+  SetDesktopFrameWithSize(webrtc::DesktopSize(32, 32));
+  EXPECT_EQ(2, delegate_.on_size_changed_call_count());
+  EXPECT_EQ(32, delegate_.canvas_width());
+  EXPECT_EQ(32, delegate_.canvas_height());
+
+  renderer_->RequestCanvasSize();
+  EXPECT_EQ(3, delegate_.on_size_changed_call_count());
+  EXPECT_EQ(32, delegate_.canvas_width());
+  EXPECT_EQ(32, delegate_.canvas_height());
+}
+
+TEST_F(GlRendererTest, TestOnFrameReceivedDoneCallbacks) {
+  delegate_.can_render_frame_ = true;
+
+  // Implicitly calls RequestRender().
+
+  PostSetDesktopFrameTasks(webrtc::DesktopSize(16, 16), 1);
+  RunUntilRendered();
+  EXPECT_EQ(1, delegate_.on_frame_rendered_call_count());
+  EXPECT_EQ(1, on_desktop_frame_processed_call_count());
+
+  PostSetDesktopFrameTasks(webrtc::DesktopSize(16, 16), 20);
+  RunUntilRendered();
+  EXPECT_EQ(2, delegate_.on_frame_rendered_call_count());
+  EXPECT_EQ(21, on_desktop_frame_processed_call_count());
+}
+
+// TODO(yuweih): Add tests to validate the rendered output.
+
+}  // namespace remoting