Extract a MockExtensionSystem to be used with TestExtensionsBrowserClient.

extensions/browser/mock_extension_system.h

+// Copyright 2014 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.
+
+#ifndef EXTENSIONS_BROWSER_MOCK_EXTENSIONS_SYSTEM_H_
+#define EXTENSIONS_BROWSER_MOCK_EXTENSIONS_SYSTEM_H_
+
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "extensions/browser/extension_registry_factory.h"
+#include "extensions/browser/extension_system.h"
+#include "extensions/browser/extension_system_provider.h"
+#include "extensions/common/one_shot_event.h"
+
+namespace extensions {
+
+// An empty ExtensionSystem for testing. Tests that need only specific
+// parts of ExtensionSystem should derive from this class and override
+// functions as needed.
+// To use this, use TestExtensionsBrowserClient::set_extension_system_factory

[James Cook, 2014/08/12 15:46:27]

nit: either blank line above or wrap together

[Yoyo Zhou, 2014/08/12 22:05:47]

Wrapped.

+// with the MockExtensionSystemFactory below.
+class MockExtensionSystem : public ExtensionSystem {
+ public:
+  explicit MockExtensionSystem(content::BrowserContext* context);
+  virtual ~MockExtensionSystem();
+
+  content::BrowserContext* browser_context() { return browser_context_; }
+
+  // ExtensionSystem overrides:
+  virtual void InitForRegularProfile(bool extensions_enabled) OVERRIDE;
+  virtual ExtensionService* extension_service() OVERRIDE;
+  virtual RuntimeData* runtime_data() OVERRIDE;
+  virtual ManagementPolicy* management_policy() OVERRIDE;
+  virtual UserScriptMaster* user_script_master() OVERRIDE;
+  virtual ProcessManager* process_manager() OVERRIDE;
+  virtual StateStore* state_store() OVERRIDE;
+  virtual StateStore* rules_store() OVERRIDE;
+  virtual InfoMap* info_map() OVERRIDE;
+  virtual LazyBackgroundTaskQueue* lazy_background_task_queue() OVERRIDE;
+  virtual EventRouter* event_router() OVERRIDE;
+  virtual ExtensionWarningService* warning_service() OVERRIDE;
+  virtual Blacklist* blacklist() OVERRIDE;
+  virtual ErrorConsole* error_console() OVERRIDE;
+  virtual InstallVerifier* install_verifier() OVERRIDE;
+  virtual QuotaService* quota_service() OVERRIDE;
+  virtual const OneShotEvent& ready() const OVERRIDE;

[James Cook, 2014/08/12 15:46:27]

Aside, not for this CL: I would like this method to return a OneShotEvent*. Then
test classes like this one would not need to have a OneShotEvent member, a
header include could be avoided, and it would be simple to return NULL. It's
also semantically weird that you can add data to a const OneShotEvent&, but
that's what you have to do to register a callback via Post().

WDYT?

[Yoyo Zhou, 2014/08/12 22:05:47]

Yeah, I agree.

+  virtual ContentVerifier* content_verifier() OVERRIDE;
+  virtual scoped_ptr<ExtensionSet> GetDependentExtensions(
+      const Extension* extension) OVERRIDE;
+
+ private:
+  content::BrowserContext* browser_context_;
+  OneShotEvent ready_;
+};

[James Cook, 2014/08/12 15:46:27]

DISALLOW_COPY_AND_ASSIGN

[Yoyo Zhou, 2014/08/12 22:05:47]

Done.

+
+// A factory to create a MockExtensionSystem. Sample use:
+//
+// MockExtensionSystemFactory<MockExtensionSystemSubclass> factory;
+// TestExtensionsBrowserClient::set_extension_system_factory(factory);
+template <typename T>
+class MockExtensionSystemFactory : public ExtensionSystemProvider {
+ public:
+  MockExtensionSystemFactory()
+      : ExtensionSystemProvider(
+            "MockExtensionSystem",
+            BrowserContextDependencyManager::GetInstance()) {
+    DependsOn(ExtensionRegistryFactory::GetInstance());
+  }
+
+  virtual ~MockExtensionSystemFactory() {}
+
+  // BrowserContextKeyedServiceFactory overrides:
+  virtual KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const OVERRIDE {
+    return new T(context);
+  }
+
+  // ExtensionSystemProvider overrides:
+  virtual ExtensionSystem* GetForBrowserContext(
+      content::BrowserContext* context) OVERRIDE {
+    return static_cast<ExtensionSystem*>(
+        GetServiceForBrowserContext(context, true));
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockExtensionSystemFactory);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_MOCK_EXTENSIONS_SYSTEM_H_