1 files changed, 83 insertions, 0 deletions
diff --git a/test/gtest_logcat_printer.cc b/test/gtest_logcat_printer.cc
new file mode 100644
index 000000000..f88e01b76
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+++ b/test/gtest_logcat_printer.cc
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// This file registers a GTest listener that logs test begin/end in logcat.
+// This is to avoid problems like b/149852934 where the test output cannot be
+// correlated with the prouction code's logcat logs because they use different
+// clock sources.
+
+#include <android/log.h>
+
+#include "test/gtest_and_gmock.h"
+
+namespace perfetto {
+namespace test {
+
+namespace {
+
+#define PERFETTO_TEST_LOG(...) \
+  __android_log_print(ANDROID_LOG_DEBUG, "perfetto", ##__VA_ARGS__)
+
+class LogcatPrinter : public testing::EmptyTestEventListener {
+ public:
+  LogcatPrinter();
+  ~LogcatPrinter() override;
+
+  // testing::EmptyTestEventListener:
+  void OnTestCaseStart(const testing::TestCase& test_case) override;
+  void OnTestStart(const testing::TestInfo& test_info) override;
+  void OnTestEnd(const testing::TestInfo& test_info) override;
+  void OnTestCaseEnd(const testing::TestCase& test_case) override;
+};
+
+LogcatPrinter::LogcatPrinter() = default;
+LogcatPrinter::~LogcatPrinter() = default;
+
+void LogcatPrinter::OnTestCaseStart(const testing::TestCase& test_case) {
+  PERFETTO_TEST_LOG("Test case start: %s", test_case.name());
+}
+
+void LogcatPrinter::OnTestStart(const testing::TestInfo& test_info) {
+  PERFETTO_TEST_LOG("Test start: %s.%s", test_info.test_case_name(),
+                    test_info.name());
+}
+
+void LogcatPrinter::OnTestEnd(const testing::TestInfo& test_info) {
+  const auto* result = test_info.result();
+  const char* state = "N/A";
+  if (result)
+    state = result->Passed() ? "PASS" : "FAIL";
+  PERFETTO_TEST_LOG("Test end: %s.%s [%s]", test_info.test_case_name(),
+                    test_info.name(), state);
+}
+
+void LogcatPrinter::OnTestCaseEnd(const testing::TestCase& test_case) {
+  PERFETTO_TEST_LOG("Test case end: %s. succeeded=%d, failed=%d",
+                    test_case.name(), test_case.successful_test_count(),
+                    test_case.failed_test_count());
+}
+
+// This static initializer
+void __attribute__((constructor)) __attribute__((visibility("default")))
+SetupGtestLogcatPrinter() {
+  static LogcatPrinter* instance = new LogcatPrinter();
+  auto& listeners = testing::UnitTest::GetInstance()->listeners();
+  listeners.Append(instance);
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace perfetto