Add a unittest for image_data_fetcher

components/image_fetcher/image_data_fetcher_unittest.cc

+// 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 "components/image_fetcher/image_data_fetcher.h"
+
+#include <memory>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/message_loop/message_loop.h"
+#include "net/url_request/test_url_fetcher_factory.h"
+#include "net/url_request/url_request_status.h"
+#include "net/url_request/url_request_test_util.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+const char kImageURL[] = "http://www.example.com/image";
+const char kURLResponseData[] = "EncodedImageData";
+
+}  // namespace
+
+namespace image_fetcher {
+
+class ImageDataFetcherTest : public testing::Test {
+ public:
+  ImageDataFetcherTest()
+      : test_request_context_getter_(
+            new net::TestURLRequestContextGetter(message_loop_.task_runner())),
+        image_data_fetcher_(test_request_context_getter_.get()) {}
+  ~ImageDataFetcherTest() override {}
+
+  MOCK_METHOD1(OnImageDataFetched, void(const std::string&));
+
+  MOCK_METHOD1(OnImageDataFetchedFailedRequest, void(const std::string&));
+
+  MOCK_METHOD1(OnImageDataFetchedMultipleRequests, void(const std::string&));
+
+ protected:
+  base::MessageLoop message_loop_;
+
+  scoped_refptr<net::URLRequestContextGetter> test_request_context_getter_;
+
+  ImageDataFetcher image_data_fetcher_;
+
+  net::TestURLFetcherFactory fetcher_factory_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ImageDataFetcherTest);
+};
+
+TEST_F(ImageDataFetcherTest, FetchImageData) {
+  image_data_fetcher_.FetchImageData(
+      GURL(kImageURL),
+      base::Bind(&ImageDataFetcherTest::OnImageDataFetched,
+                 base::Unretained(this)));
+  EXPECT_CALL(*this, OnImageDataFetched(std::string(kURLResponseData)));
+
+  // Get and configure the TestURLFetcher.
+  net::TestURLFetcher* test_url_fetcher = fetcher_factory_.GetFetcherByID(0);
+  ASSERT_NE(nullptr, test_url_fetcher);
+  test_url_fetcher->set_status(
+      net::URLRequestStatus(net::URLRequestStatus::SUCCESS, net::OK));
+  test_url_fetcher->SetResponseString(kURLResponseData);
+
+  // Call the URLFetcher delegate to continue the test.
+  test_url_fetcher->delegate()->OnURLFetchComplete(test_url_fetcher);
+}
+
+TEST_F(ImageDataFetcherTest, FetchImageData_FailedRequest) {
+  image_data_fetcher_.FetchImageData(
+      GURL(kImageURL),
+      base::Bind(&ImageDataFetcherTest::OnImageDataFetchedFailedRequest,
+                 base::Unretained(this)));
+  EXPECT_CALL(*this, OnImageDataFetchedFailedRequest(std::string()));
+
+  // Get and configure the TestURLFetcher.
+  net::TestURLFetcher* test_url_fetcher = fetcher_factory_.GetFetcherByID(0);
+  ASSERT_NE(nullptr, test_url_fetcher);
+  test_url_fetcher->set_status(
+      net::URLRequestStatus(net::URLRequestStatus::FAILED,
+                            net::ERR_INVALID_URL));
+
+  // Call the URLFetcher delegate to continue the test.
+  test_url_fetcher->delegate()->OnURLFetchComplete(test_url_fetcher);
+}
+
+TEST_F(ImageDataFetcherTest, FetchImageData_MultipleRequests) {
+  ImageDataFetcher::ImageDataFetcherCallback callback =
+      base::Bind(&ImageDataFetcherTest::OnImageDataFetchedMultipleRequests,
+                 base::Unretained(this));
+  EXPECT_CALL(*this, OnImageDataFetchedMultipleRequests(testing::_)).Times(2);
+
+  image_data_fetcher_.FetchImageData(GURL(kImageURL), callback);
+  image_data_fetcher_.FetchImageData(GURL(kImageURL), callback);
+
+  // Multiple calls to FetchImageData for the same URL will result in
+  // multiple URLFetchers being created.
+  net::TestURLFetcher* test_url_fetcher = fetcher_factory_.GetFetcherByID(0);
+  ASSERT_NE(nullptr, test_url_fetcher);
+  test_url_fetcher->delegate()->OnURLFetchComplete(test_url_fetcher);
+
+  test_url_fetcher = fetcher_factory_.GetFetcherByID(1);
+  ASSERT_NE(nullptr, test_url_fetcher);
+  test_url_fetcher->delegate()->OnURLFetchComplete(test_url_fetcher);
+}
+
+}  // namespace image_fetcher