Extensions: Pull duplicated functionality into ExtensionsTest fixture.

extensions/browser/extensions_test.cc

Index: extensions/browser/extensions_test.cc
diff --git a/extensions/browser/extensions_test.cc b/extensions/browser/extensions_test.cc
index f9f88a107396febf551987a681d23aa9ca11ae91..639ce1d3665ddc91fda4cdaf8b4567719d35416d 100644
--- a/extensions/browser/extensions_test.cc
+++ b/extensions/browser/extensions_test.cc
@@ -4,14 +4,32 @@
 
 #include "extensions/browser/extensions_test.h"
 
+#include "base/memory/ptr_util.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "components/pref_registry/pref_registry_syncable.h"
+#include "components/prefs/pref_service_factory.h"
+#include "components/prefs/testing_pref_store.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/common/content_client.h"
 #include "content/public/test/test_browser_context.h"
+#include "extensions/browser/extension_pref_value_map.h"
+#include "extensions/browser/extension_prefs.h"
+#include "extensions/browser/extension_prefs_factory.h"
 #include "extensions/browser/test_extensions_browser_client.h"
 #include "extensions/test/test_content_browser_client.h"
 #include "extensions/test/test_content_utility_client.h"
 
+namespace {
+
+std::unique_ptr<content::TestBrowserContext> CreateTestIncognitoContext() {
+  std::unique_ptr<content::TestBrowserContext> incognito_context =
+      base::MakeUnique<content::TestBrowserContext>();
+  incognito_context->set_is_off_the_record(true);
+  return incognito_context;
+}
+
+}  // namespace
+
 namespace extensions {
 
 // This class does work in the constructor instead of SetUp() to give subclasses
@@ -22,10 +40,14 @@ namespace extensions {
 //     : my_object_(browser_context())) {
 //   }
 // };
+// TODO(crbug.com/708256): All these instances are setup in the constructor, but
+// destroyed in TearDown(), which may cause problems. Move this initialization
+// to SetUp().
 ExtensionsTest::ExtensionsTest()
     : content_browser_client_(new TestContentBrowserClient),
       content_utility_client_(new TestContentUtilityClient),
       browser_context_(new content::TestBrowserContext),
+      incognito_context_(CreateTestIncognitoContext()),
       extensions_browser_client_(
           new TestExtensionsBrowserClient(browser_context_.get())) {
   content::SetBrowserClientForTesting(content_browser_client_.get());
@@ -33,6 +55,27 @@ ExtensionsTest::ExtensionsTest()
   ExtensionsBrowserClient::Set(extensions_browser_client_.get());
   extensions_browser_client_->set_extension_system_factory(
       &extension_system_factory_);
+  extensions_browser_client_->SetIncognitoContext(incognito_context_.get());
+
+  // Set up all the dependencies of ExtensionPrefs.
+  extension_pref_value_map_.reset(new ExtensionPrefValueMap());
+  PrefServiceFactory factory;
+  factory.set_user_prefs(new TestingPrefStore());
+  factory.set_extension_prefs(new TestingPrefStore());
+  user_prefs::PrefRegistrySyncable* pref_registry =
+      new user_prefs::PrefRegistrySyncable();
+  // Prefs should be registered before the PrefService is created.
+  ExtensionPrefs::RegisterProfilePrefs(pref_registry);
+  pref_service_ = factory.Create(pref_registry);
+
+  std::unique_ptr<ExtensionPrefs> extension_prefs(ExtensionPrefs::Create(
+      browser_context(), pref_service_.get(),
+      browser_context()->GetPath().AppendASCII("Extensions"),
+      extension_pref_value_map_.get(), false /* extensions_disabled */,
+      std::vector<ExtensionPrefsObserver*>()));
+
+  ExtensionPrefsFactory::GetInstance()->SetInstanceForTesting(
+      browser_context(), std::move(extension_prefs));
 }
 
 ExtensionsTest::~ExtensionsTest() {
@@ -53,8 +96,14 @@ void ExtensionsTest::TearDown() {
   // cleaned up before the factories are destroyed.
   BrowserContextDependencyManager::GetInstance()->DestroyBrowserContextServices(
       browser_context_.get());
+
+  // TODO(crbug.com/708256): |extension_browser_client_| is reset here but not
+  // unset as the singleton until the destructor. This can lead to use after
+  // free errors.
   extensions_browser_client_.reset();
   browser_context_.reset();
+  incognito_context_.reset();
+  pref_service_.reset();
 }
 
 }  // namespace extensions