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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_matchers.h
+// -----------------------------------------------------------------------------
+//
+// This file declares Googletest's matchers used in the Abseil Logging library
+// unit tests.
+
+#ifndef ABSL_LOG_INTERNAL_TEST_MATCHERS_H_
+#define ABSL_LOG_INTERNAL_TEST_MATCHERS_H_
+
+#include <iosfwd>
+#include <sstream>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/base/log_severity.h"
+#include "absl/log/internal/config.h"
+#include "absl/log/internal/test_helpers.h"
+#include "absl/log/log_entry.h"
+#include "absl/strings/string_view.h"
+#include "absl/time/time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace log_internal {
+
+// These matchers correspond to the components of `absl::LogEntry`.
+::testing::Matcher<const absl::LogEntry&> SourceFilename(
+    const ::testing::Matcher<absl::string_view>& source_filename);
+::testing::Matcher<const absl::LogEntry&> SourceBasename(
+    const ::testing::Matcher<absl::string_view>& source_basename);
+// Be careful with this one; multi-line statements using `__LINE__` evaluate
+// differently on different platforms.  In particular, the MSVC implementation
+// of `EXPECT_DEATH` returns the line number of the macro expansion to all lines
+// within the code block that's expected to die.
+::testing::Matcher<const absl::LogEntry&> SourceLine(
+    const ::testing::Matcher<int>& source_line);
+::testing::Matcher<const absl::LogEntry&> Prefix(
+    const ::testing::Matcher<bool>& prefix);
+::testing::Matcher<const absl::LogEntry&> LogSeverity(
+    const ::testing::Matcher<absl::LogSeverity>& log_severity);
+::testing::Matcher<const absl::LogEntry&> Timestamp(
+    const ::testing::Matcher<absl::Time>& timestamp);
+// Matches if the `LogEntry`'s timestamp falls after the instantiation of this
+// matcher and before its execution, as is normal when used with EXPECT_CALL.
+::testing::Matcher<const absl::LogEntry&> TimestampInMatchWindow();
+::testing::Matcher<const absl::LogEntry&> ThreadID(
+    const ::testing::Matcher<absl::LogEntry::tid_t>&);
+::testing::Matcher<const absl::LogEntry&> TextMessageWithPrefixAndNewline(
+    const ::testing::Matcher<absl::string_view>&
+        text_message_with_prefix_and_newline);
+::testing::Matcher<const absl::LogEntry&> TextMessageWithPrefix(
+    const ::testing::Matcher<absl::string_view>& text_message_with_prefix);
+::testing::Matcher<const absl::LogEntry&> TextMessage(
+    const ::testing::Matcher<absl::string_view>& text_message);
+::testing::Matcher<const absl::LogEntry&> TextPrefix(
+    const ::testing::Matcher<absl::string_view>& text_prefix);
+::testing::Matcher<const absl::LogEntry&> Verbosity(
+    const ::testing::Matcher<int>& verbosity);
+::testing::Matcher<const absl::LogEntry&> Stacktrace(
+    const ::testing::Matcher<absl::string_view>& stacktrace);
+// Behaves as `Eq(stream.str())`, but produces better failure messages.
+::testing::Matcher<absl::string_view> MatchesOstream(
+    const std::ostringstream& stream);
+::testing::Matcher<const std::string&> DeathTestValidateExpectations();
+
+// This feature coming soon =).
+#define ENCODED_MESSAGE(message_matcher) ::testing::_
+
+}  // namespace log_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_LOG_INTERNAL_TEST_MATCHERS_H_