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+// Copyright 2016 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_SCOPED_FEATURE_LIST_H_
+#define BASE_TEST_SCOPED_FEATURE_LIST_H_
+
+#include <initializer_list>
+
+#include "base/feature_list.h"
+
+namespace base {
+namespace test {
+
+// ScopedFeatureList resets the global FeatureList instance to a new empty
+// instance and restores the original instance upon destruction.
+// Note: Re-using the same object is not allowed. To reset the feature
+// list and initialize it anew, destroy an existing scoped list and init
+// a new one.
+class ScopedFeatureList final {
+ public:
+ ScopedFeatureList();
+ ~ScopedFeatureList();
+
+ // Initializes and registers a FeatureList instance with no overrides.
+ void Init();
+
+ // Initializes and registers the given FeatureList instance.
+ void InitWithFeatureList(std::unique_ptr<FeatureList> feature_list);
+
+ // Initializes and registers a FeatureList instance with the given enabled
+ // and disabled features.
+ void InitWithFeatures(
+ const std::initializer_list<base::Feature>& enabled_features,
+ const std::initializer_list<base::Feature>& disabled_features);
+
+ // Initializes and registers a FeatureList instance with the given
+ // enabled and disabled features (comma-separated names).
+ void InitFromCommandLine(const std::string& enable_features,
+ const std::string& disable_features);
+
+ // Initializes and registers a FeatureList instance enabling a single
+ // feature.
+ void InitAndEnableFeature(const base::Feature& feature);
+
+ // Initializes and registers a FeatureList instance disabling a single
+ // feature.
+ void InitAndDisableFeature(const base::Feature& feature);
+
+ private:
+ std::unique_ptr<FeatureList> original_feature_list_;
+
+ DISALLOW_COPY_AND_ASSIGN(ScopedFeatureList);
+};
+
+} // namespace test
+} // namespace base
+
+#endif // BASE_TEST_SCOPED_FEATURE_LIST_H_