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// Copyright (c) 2011 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 BASE_TEST_TEST_REG_UTIL_H_
#define BASE_TEST_TEST_REG_UTIL_H_
// Registry utility functions used only by tests.
#include "base/basictypes.h"
#include "base/memory/scoped_vector.h"
#include "base/strings/string16.h"
#include "base/time/time.h"
#include "base/win/registry.h"
namespace registry_util {
// Allows a test to easily override registry hives so that it can start from a
// known good state, or make sure to not leave any side effects once the test
// completes. This supports parallel tests. All the overrides are scoped to the
// lifetime of the override manager. Destroy the manager to undo the overrides.
//
// Overridden hives use keys stored at, for instance:
// HKCU\Software\Chromium\TempTestKeys\
// 13028145911617809$02AB211C-CF73-478D-8D91-618E11998AED
// The key path are comprises of:
// - The test key root, HKCU\Software\Chromium\TempTestKeys\
// - The base::Time::ToInternalValue of the creation time. This is used to
// delete stale keys left over from crashed tests.
// - A GUID used for preventing name collisions (although unlikely) between
// two RegistryOverrideManagers created with the same timestamp.
class RegistryOverrideManager {
public:
RegistryOverrideManager();
~RegistryOverrideManager();
// Override the given registry hive using a temporary key named by temp_name
// under the temporary test key path. There is no need to randomize
// |override_name|, as a random parent key is generated. Multiple overrides to
// the same hive are not supported and lead to undefined behavior.
void OverrideRegistry(HKEY override, const base::string16& override_name);
private:
friend class RegistryOverrideManagerTest;
// Keeps track of one override.
class ScopedRegistryKeyOverride {
public:
ScopedRegistryKeyOverride(HKEY override, const base::string16& key_path);
~ScopedRegistryKeyOverride();
private:
HKEY override_;
base::win::RegKey temp_key_;
DISALLOW_COPY_AND_ASSIGN(ScopedRegistryKeyOverride);
};
// Used for testing only.
RegistryOverrideManager(const base::Time& timestamp,
const base::string16& test_key_root);
base::Time timestamp_;
base::string16 guid_;
base::string16 test_key_root_;
ScopedVector<ScopedRegistryKeyOverride> overrides_;
DISALLOW_COPY_AND_ASSIGN(RegistryOverrideManager);
};
// Generates a temporary key path that will be eventually deleted
// automatically if the process crashes.
base::string16 GenerateTempKeyPath();
} // namespace registry_util
#endif // BASE_TEST_TEST_REG_UTIL_H_
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