Implement the Windows desktop search redirection feature.

components/search_engines/desktop_search_utils_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/search_engines/desktop_search_utils.h"
+
+#include <string>
+
+#include "base/feature_list.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/prefs/pref_service.h"
+#include "base/strings/string16.h"
+#include "components/search_engines/prepopulated_engines.h"
+#include "components/search_engines/template_url.h"
+#include "components/search_engines/template_url_prepopulate_data.h"
+#include "components/search_engines/template_url_service.h"
+#include "components/search_engines/util.h"
+#include "components/syncable_prefs/testing_pref_service_syncable.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "url/gurl.h"
+
+namespace {

[Peter Kasting, 2016/01/22 00:38:57]

Nit: Blank line below this and above the corresponding closing brace line

[fdoray, 2016/02/01 15:15:54]

Done.

+struct ReplaceDesktopSearchURLTestData {
+  // Value of the |url| argument of
+  // ReplaceDesktopSearchURLWithDefaultSearchURLIfNeeded on input.
+  const char* input_arg;
+
+  // Expected value of the |url| argument of
+  // ReplaceDesktopSearchURLWithDefaultSearchURLIfNeeded on output.
+  const char* expected_output_arg;
+};
+
+struct ShouldReplaceDesktopSearchURLTestData {
+  bool feature_enabled;
+  bool default_search_engine_is_bing;
+  const GURL* expected_output_arg;
+};
+}  // namespace
+
+class DesktopSearchUtilsTest : public testing::Test {
+ public:
+  DesktopSearchUtilsTest() : template_url_service_(nullptr, 0) {
+    RegisterDesktopSearchRedirectionPref(prefs_.registry());
+  }
+
+ protected:
+  void SetFeatureEnabled(bool enabled) {
+    base::FeatureList::ClearInstanceForTesting();
+    scoped_ptr<base::FeatureList> feature_list(new base::FeatureList);
+    if (enabled) {
+      feature_list->InitializeFromCommandLine(
+          kDesktopSearchRedirectionFeature.name, std::string());
+    }
+    base::FeatureList::SetInstance(std::move(feature_list));
+  }
+
+  void SetDefaultSearchEngine(
+      const TemplateURLPrepopulateData::PrepopulatedEngine
+          default_search_engine) {
+    scoped_ptr<TemplateURLData> template_url_data =
+        TemplateURLPrepopulateData::MakeTemplateURLDataFromPrepopulatedEngine(
+            default_search_engine);
+    TemplateURL template_url(*template_url_data);
+    template_url_service_.SetUserSelectedDefaultSearchProvider(&template_url);
+  }
+
+  TemplateURLService template_url_service_;
+  syncable_prefs::TestingPrefServiceSyncable prefs_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DesktopSearchUtilsTest);
+};
+
+TEST_F(DesktopSearchUtilsTest, ReplaceDesktopSearchURL) {

[Peter Kasting, 2016/01/22 00:38:57]

Nit: Add a brief comment above each test describing what functionality the test
is verifying.

[fdoray, 2016/02/01 15:15:54]

Done.

+  const std::string default_search_url_keyword(
+      GetDefaultSearchURLForSearchTerms(&template_url_service_, L"keyword")
+          .spec());
+  const std::string default_search_url_special_chars(
+      GetDefaultSearchURLForSearchTerms(&template_url_service_, L"\xE8 \xE9")
+          .spec());
+
+  const ReplaceDesktopSearchURLTestData test_data[] = {
+      {"https://www.google.com/", "https://www.google.com/"},
+      {"https://www.bing.com/search/", "https://www.bing.com/search/"},
+      {"https://www.bing.com/search?q=keyword&form=QBLH",
+       "https://www.bing.com/search?q=keyword&form=QBLH"},
+      {"https://www.bing.com/search?q=keyword&form=WNSGPH",
+       default_search_url_keyword.c_str()},
+      {"https://www.bing.com/search?q=keyword&form=WNSBOX",
+       default_search_url_keyword.c_str()},
+      {"https://www.bing.com/search?q=keyword&FORM=WNSGPH",
+       default_search_url_keyword.c_str()},
+      {"https://www.bing.com/search?q=keyword&FORM=WNSBOX",
+       default_search_url_keyword.c_str()},
+      {"https://www.bing.com/search?form=WNSGPH&q=keyword",
+       default_search_url_keyword.c_str()},
+      {"https://www.bing.com/search?q=keyword&form=WNSGPH&other=stuff",
+       default_search_url_keyword.c_str()},
+      {"https://www.bing.com/search?q=%C3%A8+%C3%A9&form=WNSGPH",
+       default_search_url_special_chars.c_str()},
+  };
+
+  SetFeatureEnabled(true);
+
+  for (const auto& test : test_data) {
+    GURL url(test.input_arg);
+    ReplaceDesktopSearchURLWithDefaultSearchURLIfNeeded(
+        &prefs_, &template_url_service_, &url);
+    EXPECT_EQ(test.expected_output_arg, url.spec());
+  }
+}
+
+TEST_F(DesktopSearchUtilsTest, ShouldReplaceDesktopSearchURL) {
+  SetDefaultSearchEngine(TemplateURLPrepopulateData::google);
+  const GURL desktop_search_url(
+      L"https://www.bing.com/search?q=keyword&form=WNSGPH");
+  const GURL default_search_url(
+      GetDefaultSearchURLForSearchTerms(&template_url_service_, L"keyword"));
+
+  const ShouldReplaceDesktopSearchURLTestData test_data[] = {
+      {false, false, &desktop_search_url},
+      {true, false, &default_search_url},
+      {false, true, &desktop_search_url},
+      {true, true, &desktop_search_url},
+  };
+
+  for (const auto& test : test_data) {
+    SetFeatureEnabled(test.feature_enabled);
+    SetDefaultSearchEngine(test.default_search_engine_is_bing
+                               ? TemplateURLPrepopulateData::bing
+                               : TemplateURLPrepopulateData::google);
+
+    // Check whether the desktop search URL is replaced.
+    GURL url(desktop_search_url);
+    ReplaceDesktopSearchURLWithDefaultSearchURLIfNeeded(
+        &prefs_, &template_url_service_, &url);
+    EXPECT_EQ(*test.expected_output_arg, url);
+  }
+}