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83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TEST_TEST_REG_UTIL_WIN_H_
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#define BASE_TEST_TEST_REG_UTIL_WIN_H_
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// Registry utility functions used only by tests.
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#include <memory>
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#include <vector>
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#include "base/macros.h"
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#include "base/strings/string16.h"
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#include "base/time/time.h"
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#include "base/win/registry.h"
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namespace registry_util {
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// Allows a test to easily override registry hives so that it can start from a
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// known good state, or make sure to not leave any side effects once the test
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// completes. This supports parallel tests. All the overrides are scoped to the
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// lifetime of the override manager. Destroy the manager to undo the overrides.
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//
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// Overridden hives use keys stored at, for instance:
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// HKCU\Software\Chromium\TempTestKeys\
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// 13028145911617809$02AB211C-CF73-478D-8D91-618E11998AED
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// The key path are comprises of:
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// - The test key root, HKCU\Software\Chromium\TempTestKeys\
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// - The base::Time::ToInternalValue of the creation time. This is used to
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// delete stale keys left over from crashed tests.
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// - A GUID used for preventing name collisions (although unlikely) between
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// two RegistryOverrideManagers created with the same timestamp.
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class RegistryOverrideManager {
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public:
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RegistryOverrideManager();
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~RegistryOverrideManager();
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// Override the given registry hive using a randomly generated temporary key.
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// Multiple overrides to the same hive are not supported and lead to undefined
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// behavior.
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// Optional return of the registry override path.
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// Calls to these functions must be wrapped in ASSERT_NO_FATAL_FAILURE to
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// ensure that tests do not proceeed in case of failure to override.
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void OverrideRegistry(HKEY override);
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void OverrideRegistry(HKEY override, base::string16* override_path);
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private:
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friend class RegistryOverrideManagerTest;
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// Keeps track of one override.
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class ScopedRegistryKeyOverride {
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public:
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ScopedRegistryKeyOverride(HKEY override, const base::string16& key_path);
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~ScopedRegistryKeyOverride();
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private:
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HKEY override_;
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base::string16 key_path_;
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DISALLOW_COPY_AND_ASSIGN(ScopedRegistryKeyOverride);
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};
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// Used for testing only.
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RegistryOverrideManager(const base::Time& timestamp,
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const base::string16& test_key_root);
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base::Time timestamp_;
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base::string16 guid_;
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base::string16 test_key_root_;
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std::vector<std::unique_ptr<ScopedRegistryKeyOverride>> overrides_;
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DISALLOW_COPY_AND_ASSIGN(RegistryOverrideManager);
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};
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// Generates a temporary key path that will be eventually deleted
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// automatically if the process crashes.
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base::string16 GenerateTempKeyPath();
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} // namespace registry_util
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#endif // BASE_TEST_TEST_REG_UTIL_WIN_H_
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