Implemented 'Reset Search engines' feature.

chrome/browser/search_engines/template_url_prepopulate_data_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 "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_vector.h"
 #include "base/utf_string_conversions.h"
+#include "chrome/browser/search_engines/prepopulated_engines.h"
 #include "chrome/browser/search_engines/search_terms_data.h"
 #include "chrome/browser/search_engines/template_url.h"
 #include "chrome/browser/search_engines/template_url_prepopulate_data.h"
 #include "chrome/browser/search_engines/template_url_service.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_pref_service_syncable.h"
 #include "chrome/test/base/testing_profile.h"
 #include "grit/generated_resources.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 155 matching lines @@
   entry->SetString("encoding", "UTF-8");
   overrides->Append(entry->DeepCopy());
   prefs->SetUserPref(prefs::kSearchProviderOverrides, overrides);
 
   t_urls.clear();
   TemplateURLPrepopulateData::GetPrepopulatedEngines(&profile, &t_urls.get(),
                                                      &default_index);
   EXPECT_EQ(2u, t_urls.size());
 }
 
+TEST(TemplateURLPrepopulateDataTest, ClearProvidersFromPrefs) {
+  // Use United States.
+  CommandLine::ForCurrentProcess()->AppendSwitchASCII(
+      switches::kCountry, "US");
+  TestingProfile profile;
+  TestingPrefServiceSyncable* prefs = profile.GetTestingPrefService();
+  prefs->SetUserPref(prefs::kSearchProviderOverridesVersion,
+                     Value::CreateIntegerValue(1));
+  ListValue* overrides = new ListValue;
+  scoped_ptr<DictionaryValue> entry(new DictionaryValue);
+  // Set only the minimal required settings for a search provider configuration.
+  entry->SetString("name", "foo");
+  entry->SetString("keyword", "fook");
+  entry->SetString("search_url", "http://foo.com/s?q={searchTerms}");
+  entry->SetString("favicon_url", "http://foi.com/favicon.ico");
+  entry->SetString("encoding", "UTF-8");
+  entry->SetInteger("id", 1001);
+  overrides->Append(entry->DeepCopy());

[battre, 2013/05/22 14:03:37]

nit: Either entry.Pass() or allocate entry on the stack?

[vasilii, 2013/05/22 18:54:08]

Done.

+  prefs->SetUserPref(prefs::kSearchProviderOverrides, overrides);
+
+  int version = TemplateURLPrepopulateData::GetDataVersion(prefs);
+  EXPECT_EQ(1, version);
+
+  // This call removes the above search engine.
+  TemplateURLPrepopulateData::ClearPrepopulatedEnginesInPrefs(&profile);
+
+  version = TemplateURLPrepopulateData::GetDataVersion(prefs);
+  EXPECT_EQ(TemplateURLPrepopulateData::kCurrentDataVersion, version);
+
+  ScopedVector<TemplateURL> t_urls;
+  size_t default_index;
+  TemplateURLPrepopulateData::GetPrepopulatedEngines(&profile, &t_urls.get(),
+                                                     &default_index);
+  ASSERT_FALSE(t_urls.empty());
+  for (size_t i = 0; i < t_urls.size(); ++i) {
+    EXPECT_NE(ASCIIToUTF16("foo"), t_urls[i]->short_name());
+    EXPECT_NE(ASCIIToUTF16("fook"), t_urls[i]->keyword());
+    EXPECT_NE("foi.com", t_urls[i]->favicon_url().host());
+    EXPECT_NE("foo.com", t_urls[i]->url_ref().GetHost());
+    EXPECT_NE(1001, t_urls[i]->prepopulate_id());
+  }
+  // Ensures the default URL is Google and has the optional fields filled.
+  EXPECT_EQ(ASCIIToUTF16("Google"), t_urls[default_index]->short_name());
+  EXPECT_FALSE(t_urls[default_index]->suggestions_url().empty());
+  EXPECT_FALSE(t_urls[default_index]->instant_url().empty());
+  EXPECT_EQ(SEARCH_ENGINE_GOOGLE,
+      TemplateURLPrepopulateData::GetEngineType(t_urls[default_index]->url()));
+}
+
 // Verifies that built-in search providers are processed correctly.
 TEST(TemplateURLPrepopulateDataTest, ProvidersFromPrepopulated) {
   // Use United States.
   CommandLine::ForCurrentProcess()->AppendSwitchASCII(
       switches::kCountry, "US");
   TestingProfile profile;
   ScopedVector<TemplateURL> t_urls;
   size_t default_index;
   TemplateURLPrepopulateData::GetPrepopulatedEngines(&profile, &t_urls.get(),
                                                      &default_index);
@@ skipping 100 matching lines @@
 
 TEST(TemplateURLPrepopulateDataTest, GetLogoURLInvalid) {
   TemplateURLData data;
   data.SetURL("http://invalid:search:url/");
   TemplateURL turl(NULL, data);
   GURL logo_url = TemplateURLPrepopulateData::GetLogoURL(
       turl, TemplateURLPrepopulateData::LOGO_100_PERCENT);
 
   EXPECT_TRUE(logo_url.is_empty());
 }