1 files changed, 107 insertions, 0 deletions
diff --git a/third_party/libwebrtc/system_wrappers/source/field_trial_unittest.cc b/third_party/libwebrtc/system_wrappers/source/field_trial_unittest.cc
new file mode 100644
index 0000000000..ada6313e67
--- /dev/null
+++ b/third_party/libwebrtc/system_wrappers/source/field_trial_unittest.cc
@@ -0,0 +1,107 @@
+/*
+ *  Copyright 2019 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.
+ */
+#include "system_wrappers/include/field_trial.h"
+
+#include "rtc_base/checks.h"
+#include "test/gtest.h"
+#include "test/testsupport/rtc_expect_death.h"
+
+namespace webrtc {
+namespace field_trial {
+#if GTEST_HAS_DEATH_TEST && RTC_DCHECK_IS_ON && !defined(WEBRTC_ANDROID) && \
+    !defined(WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT)
+TEST(FieldTrialValidationTest, AcceptsValidInputs) {
+  InitFieldTrialsFromString("");
+  InitFieldTrialsFromString("Audio/Enabled/");
+  InitFieldTrialsFromString("Audio/Enabled/Video/Disabled/");
+  EXPECT_TRUE(FieldTrialsStringIsValid(""));
+  EXPECT_TRUE(FieldTrialsStringIsValid("Audio/Enabled/"));
+  EXPECT_TRUE(FieldTrialsStringIsValid("Audio/Enabled/Video/Disabled/"));
+
+  // Duplicate trials with the same value is fine
+  InitFieldTrialsFromString("Audio/Enabled/Audio/Enabled/");
+  InitFieldTrialsFromString("Audio/Enabled/B/C/Audio/Enabled/");
+  EXPECT_TRUE(FieldTrialsStringIsValid("Audio/Enabled/Audio/Enabled/"));
+  EXPECT_TRUE(FieldTrialsStringIsValid("Audio/Enabled/B/C/Audio/Enabled/"));
+}
+
+TEST(FieldTrialValidationDeathTest, RejectsBadInputs) {
+  // Bad delimiters
+  RTC_EXPECT_DEATH(InitFieldTrialsFromString("Audio/EnabledVideo/Disabled/"),
+                   "Invalid field trials string:");
+  RTC_EXPECT_DEATH(InitFieldTrialsFromString("Audio/Enabled//Video/Disabled/"),
+                   "Invalid field trials string:");
+  RTC_EXPECT_DEATH(InitFieldTrialsFromString("/Audio/Enabled/Video/Disabled/"),
+                   "Invalid field trials string:");
+  RTC_EXPECT_DEATH(InitFieldTrialsFromString("Audio/Enabled/Video/Disabled"),
+                   "Invalid field trials string:");
+  RTC_EXPECT_DEATH(
+      InitFieldTrialsFromString("Audio/Enabled/Video/Disabled/garbage"),
+      "Invalid field trials string:");
+  EXPECT_FALSE(FieldTrialsStringIsValid("Audio/EnabledVideo/Disabled/"));
+  EXPECT_FALSE(FieldTrialsStringIsValid("Audio/Enabled//Video/Disabled/"));
+  EXPECT_FALSE(FieldTrialsStringIsValid("/Audio/Enabled/Video/Disabled/"));
+  EXPECT_FALSE(FieldTrialsStringIsValid("Audio/Enabled/Video/Disabled"));
+  EXPECT_FALSE(
+      FieldTrialsStringIsValid("Audio/Enabled/Video/Disabled/garbage"));
+
+  // Empty trial or group
+  RTC_EXPECT_DEATH(InitFieldTrialsFromString("Audio//"),
+                   "Invalid field trials string:");
+  RTC_EXPECT_DEATH(InitFieldTrialsFromString("/Enabled/"),
+                   "Invalid field trials string:");
+  RTC_EXPECT_DEATH(InitFieldTrialsFromString("//"),
+                   "Invalid field trials string:");
+  RTC_EXPECT_DEATH(InitFieldTrialsFromString("//Enabled"),
+                   "Invalid field trials string:");
+  EXPECT_FALSE(FieldTrialsStringIsValid("Audio//"));
+  EXPECT_FALSE(FieldTrialsStringIsValid("/Enabled/"));
+  EXPECT_FALSE(FieldTrialsStringIsValid("//"));
+  EXPECT_FALSE(FieldTrialsStringIsValid("//Enabled"));
+
+  // Duplicate trials with different values is not fine
+  RTC_EXPECT_DEATH(InitFieldTrialsFromString("Audio/Enabled/Audio/Disabled/"),
+                   "Invalid field trials string:");
+  RTC_EXPECT_DEATH(
+      InitFieldTrialsFromString("Audio/Enabled/B/C/Audio/Disabled/"),
+      "Invalid field trials string:");
+  EXPECT_FALSE(FieldTrialsStringIsValid("Audio/Enabled/Audio/Disabled/"));
+  EXPECT_FALSE(FieldTrialsStringIsValid("Audio/Enabled/B/C/Audio/Disabled/"));
+}
+
+TEST(FieldTrialMergingTest, MergesValidInput) {
+  EXPECT_EQ(MergeFieldTrialsStrings("Video/Enabled/", "Audio/Enabled/"),
+            "Audio/Enabled/Video/Enabled/");
+  EXPECT_EQ(MergeFieldTrialsStrings("Audio/Disabled/Video/Enabled/",
+                                    "Audio/Enabled/"),
+            "Audio/Enabled/Video/Enabled/");
+  EXPECT_EQ(
+      MergeFieldTrialsStrings("Audio/Enabled/Video/Enabled/", "Audio/Enabled/"),
+      "Audio/Enabled/Video/Enabled/");
+  EXPECT_EQ(
+      MergeFieldTrialsStrings("Audio/Enabled/Audio/Enabled/", "Video/Enabled/"),
+      "Audio/Enabled/Video/Enabled/");
+}
+
+TEST(FieldTrialMergingDeathTest, DchecksBadInput) {
+  RTC_EXPECT_DEATH(MergeFieldTrialsStrings("Audio/Enabled/", "garbage"),
+                   "Invalid field trials string:");
+}
+
+TEST(FieldTrialMergingTest, HandlesEmptyInput) {
+  EXPECT_EQ(MergeFieldTrialsStrings("", "Audio/Enabled/"), "Audio/Enabled/");
+  EXPECT_EQ(MergeFieldTrialsStrings("Audio/Enabled/", ""), "Audio/Enabled/");
+  EXPECT_EQ(MergeFieldTrialsStrings("", ""), "");
+}
+#endif  // GTEST_HAS_DEATH_TEST && RTC_DCHECK_IS_ON && !defined(WEBRTC_ANDROID)
+        // && !defined(WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT)
+
+}  // namespace field_trial
+}  // namespace webrtc