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+// Copyright 2022 The Abseil Authors.
+//
+// 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
+//
+//      https://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.
+//
+// -----------------------------------------------------------------------------
+// File: log/internal/test_actions.h
+// -----------------------------------------------------------------------------
+//
+// This file declares Googletest's actions used in the Abseil Logging library
+// unit tests.
+
+#ifndef ABSL_LOG_INTERNAL_TEST_ACTIONS_H_
+#define ABSL_LOG_INTERNAL_TEST_ACTIONS_H_
+
+#include <iostream>
+#include <ostream>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/base/log_severity.h"
+#include "absl/log/log_entry.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace log_internal {
+
+// These actions are used by the child process in a death test.
+//
+// Expectations set in the child cannot cause test failure in the parent
+// directly.  Instead, the child can use these actions with
+// `EXPECT_CALL`/`WillOnce` and `ON_CALL`/`WillByDefault` (for unexpected calls)
+// to write messages to stderr that the parent can match against.
+struct WriteToStderr final {
+  explicit WriteToStderr(absl::string_view m) : message(m) {}
+  std::string message;
+
+  template <typename... Args>
+  void operator()(const Args&...) const {
+    std::cerr << message << std::endl;
+  }
+};
+
+struct WriteToStderrWithFilename final {
+  explicit WriteToStderrWithFilename(absl::string_view m) : message(m) {}
+
+  std::string message;
+
+  void operator()(const absl::LogEntry& entry) const;
+};
+
+struct WriteEntryToStderr final {
+  explicit WriteEntryToStderr(absl::string_view m) : message(m) {}
+
+  std::string message = "";
+
+  void operator()(const absl::LogEntry& entry) const;
+  void operator()(absl::LogSeverity, absl::string_view,
+                  absl::string_view) const;
+};
+
+// See the documentation for `DeathTestValidateExpectations` above.
+// `DeathTestExpectedLogging` should be used once in a given death test, and the
+// applicable severity level is the one that should be passed to
+// `DeathTestValidateExpectations`.
+inline WriteEntryToStderr DeathTestExpectedLogging() {
+  return WriteEntryToStderr{"Mock received expected entry:"};
+}
+
+// `DeathTestUnexpectedLogging` should be used zero or more times to mark
+// messages that should not hit the logs as the process dies.
+inline WriteEntryToStderr DeathTestUnexpectedLogging() {
+  return WriteEntryToStderr{"Mock received unexpected entry:"};
+}
+
+}  // namespace log_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_LOG_INTERNAL_TEST_ACTIONS_H_