Refactor net tests to use GMock matchers for checking net::Error results

net/base/upload_bytes_element_reader_unittest.cc

 // Copyright (c) 2012 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 "net/base/upload_bytes_element_reader.h"
 
 #include <memory>
 
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
+#include "net/test/gtest_util.h"
+#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
+using net::test::IsOk;
+
 namespace net {
 
 class UploadBytesElementReaderTest : public PlatformTest {
  protected:
   void SetUp() override {
     const char kData[] = "123abc";
     bytes_.assign(kData, kData + arraysize(kData));
     reader_.reset(new UploadBytesElementReader(&bytes_[0], bytes_.size()));
-    ASSERT_EQ(OK, reader_->Init(CompletionCallback()));
+    ASSERT_THAT(reader_->Init(CompletionCallback()), IsOk());
     EXPECT_EQ(bytes_.size(), reader_->GetContentLength());
     EXPECT_EQ(bytes_.size(), reader_->BytesRemaining());
     EXPECT_TRUE(reader_->IsInMemory());
   }
 
   std::vector<char> bytes_;
   std::unique_ptr<UploadElementReader> reader_;
 };
 
 TEST_F(UploadBytesElementReaderTest, ReadPartially) {
@@ skipping 38 matching lines @@
   scoped_refptr<IOBuffer> wrapped_buffer = new WrappedIOBuffer(&buf[0]);
 
   // Read all.
   EXPECT_EQ(
       static_cast<int>(buf.size()),
       reader_->Read(wrapped_buffer.get(), buf.size(), CompletionCallback()));
   EXPECT_EQ(0U, reader_->BytesRemaining());
   EXPECT_EQ(bytes_, buf);
 
   // Call Init() again to reset the state.
-  ASSERT_EQ(OK, reader_->Init(CompletionCallback()));
+  ASSERT_THAT(reader_->Init(CompletionCallback()), IsOk());
   EXPECT_EQ(bytes_.size(), reader_->GetContentLength());
   EXPECT_EQ(bytes_.size(), reader_->BytesRemaining());
 
   // Read again.
   EXPECT_EQ(
       static_cast<int>(buf.size()),
       reader_->Read(wrapped_buffer.get(), buf.size(), CompletionCallback()));
   EXPECT_EQ(0U, reader_->BytesRemaining());
   EXPECT_EQ(bytes_, buf);
 }
 
 }  // namespace net