1 /* 2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_TEST_FIELD_TRIAL_H_ 12 #define WEBRTC_TEST_FIELD_TRIAL_H_ 13 14 #include <string> 15 #include <map> 16 17 namespace webrtc { 18 namespace test { 19 20 // Parses enabled field trials from a string config, such as the one passed 21 // to chrome's argument --force-fieldtrials and initializes webrtc::field_trial 22 // with such a config. 23 // E.g.: 24 // "WebRTC-experimentFoo/Enabled/WebRTC-experimentBar/Enabled100kbps/" 25 // Assigns the process to group "Enabled" on WebRTCExperimentFoo trial 26 // and to group "Enabled100kbps" on WebRTCExperimentBar. 27 // 28 // E.g. invalid config: 29 // "WebRTC-experiment1/Enabled" (note missing / separator at the end). 30 // 31 // Note: This method crashes with an error message if an invalid config is 32 // passed to it. That can be used to find out if a binary is parsing the flags. 33 void InitFieldTrialsFromString(const std::string& config); 34 35 // This class is used to override field-trial configs within specific tests. 36 // After this class goes out of scope previous field trials will be restored. 37 class ScopedFieldTrials { 38 public: 39 explicit ScopedFieldTrials(const std::string& config); 40 ~ScopedFieldTrials(); 41 private: 42 std::string current_field_trials_; 43 const char* previous_field_trials_; 44 }; 45 46 } // namespace test 47 } // namespace webrtc 48 49 #endif // WEBRTC_TEST_FIELD_TRIAL_H_ 50