Reland of Add optional visualization file writers to VideoProcessor tests.

webrtc/test/testsupport/yuv_frame_writer_unittest.cc

+/*
+ *  Copyright (c) 2017 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 <memory>
+
+#include "webrtc/test/gtest.h"
+#include "webrtc/test/testsupport/fileutils.h"
+#include "webrtc/test/testsupport/frame_writer.h"
+
+namespace webrtc {
+namespace test {
+
+namespace {
+const size_t kFrameWidth = 50;
+const size_t kFrameHeight = 20;
+const size_t kFrameLength = 3 * kFrameWidth * kFrameHeight / 2;  // I420.
+}  // namespace
+
+class YuvFrameWriterTest : public testing::Test {
+ protected:
+  YuvFrameWriterTest() = default;
+  ~YuvFrameWriterTest() override = default;
+
+  void SetUp() override {
+    temp_filename_ = webrtc::test::TempFilename(webrtc::test::OutputPath(),
+                                                "yuv_frame_writer_unittest");
+    frame_writer_.reset(
+        new YuvFrameWriterImpl(temp_filename_, kFrameWidth, kFrameHeight));
+    ASSERT_TRUE(frame_writer_->Init());
+  }
+
+  void TearDown() override { remove(temp_filename_.c_str()); }
+
+  std::unique_ptr<FrameWriter> frame_writer_;
+  std::string temp_filename_;
+};
+
+TEST_F(YuvFrameWriterTest, InitSuccess) {}
+
+TEST_F(YuvFrameWriterTest, FrameLength) {
+  EXPECT_EQ(kFrameLength, frame_writer_->FrameLength());
+}
+
+TEST_F(YuvFrameWriterTest, WriteFrame) {
+  uint8_t buffer[kFrameLength];
+  memset(buffer, 9, kFrameLength);  // Write lots of 9s to the buffer.
+  bool result = frame_writer_->WriteFrame(buffer);
+  ASSERT_TRUE(result);
+
+  frame_writer_->Close();
+  EXPECT_EQ(kFrameLength, GetFileSize(temp_filename_));
+}
+
+TEST_F(YuvFrameWriterTest, WriteFrameUninitialized) {
+  uint8_t buffer[kFrameLength];
+  YuvFrameWriterImpl frame_writer(temp_filename_, kFrameWidth, kFrameHeight);
+  EXPECT_FALSE(frame_writer.WriteFrame(buffer));
+}
+
+}  // namespace test
+}  // namespace webrtc