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+/*
+ * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef TEST_FIELD_TRIAL_H_
+#define TEST_FIELD_TRIAL_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+namespace webrtc {
+namespace test {
+
+// This class is used to override field-trial configs within specific tests.
+// After this class goes out of scope previous field trials will be restored.
+class ScopedFieldTrials {
+ public:
+ explicit ScopedFieldTrials(absl::string_view config);
+ ScopedFieldTrials(const ScopedFieldTrials&) = delete;
+ ScopedFieldTrials& operator=(const ScopedFieldTrials&) = delete;
+ ~ScopedFieldTrials();
+
+ private:
+ std::string current_field_trials_;
+ const char* previous_field_trials_;
+};
+
+} // namespace test
+} // namespace webrtc
+
+#endif // TEST_FIELD_TRIAL_H_