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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.
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/base/attributes.h"
#include "absl/base/log_severity.h"
#include "absl/log/log.h"
#include "absl/log/scoped_mock_log.h"
namespace {
using ::testing::_;
using ::testing::Eq;
namespace not_absl {
class Dummy {
public:
Dummy() {}
private:
Dummy(const Dummy&) = delete;
Dummy& operator=(const Dummy&) = delete;
};
// This line tests that local definitions of INFO, WARNING, ERROR, and
// etc don't shadow the global ones used by the logging macros. If
// they do, the LOG() calls in the tests won't compile, catching the
// bug.
const Dummy INFO, WARNING, ERROR, FATAL, NUM_SEVERITIES;
// These makes sure that the uses of same-named types in the
// implementation of the logging macros are fully qualified.
class string {};
class vector {};
class LogMessage {};
class LogMessageFatal {};
class LogMessageQuietlyFatal {};
class LogMessageVoidify {};
class LogSink {};
class NullStream {};
class NullStreamFatal {};
} // namespace not_absl
using namespace not_absl; // NOLINT
// Tests for LOG(LEVEL(()).
TEST(LogHygieneTest, WorksForQualifiedSeverity) {
absl::ScopedMockLog test_sink(absl::MockLogDefault::kDisallowUnexpected);
::testing::InSequence seq;
EXPECT_CALL(test_sink, Log(absl::LogSeverity::kInfo, _, "To INFO"));
EXPECT_CALL(test_sink, Log(absl::LogSeverity::kWarning, _, "To WARNING"));
EXPECT_CALL(test_sink, Log(absl::LogSeverity::kError, _, "To ERROR"));
test_sink.StartCapturingLogs();
// Note that LOG(LEVEL()) expects the severity as a run-time
// expression (as opposed to a compile-time constant). Hence we
// test that :: is allowed before INFO, etc.
LOG(LEVEL(absl::LogSeverity::kInfo)) << "To INFO";
LOG(LEVEL(absl::LogSeverity::kWarning)) << "To WARNING";
LOG(LEVEL(absl::LogSeverity::kError)) << "To ERROR";
}
TEST(LogHygieneTest, WorksWithAlternativeINFOSymbol) {
const double INFO ABSL_ATTRIBUTE_UNUSED = 7.77;
absl::ScopedMockLog test_sink(absl::MockLogDefault::kDisallowUnexpected);
EXPECT_CALL(test_sink, Log(absl::LogSeverity::kInfo, _, "Hello world"));
test_sink.StartCapturingLogs();
LOG(INFO) << "Hello world";
}
TEST(LogHygieneTest, WorksWithAlternativeWARNINGSymbol) {
const double WARNING ABSL_ATTRIBUTE_UNUSED = 7.77;
absl::ScopedMockLog test_sink(absl::MockLogDefault::kDisallowUnexpected);
EXPECT_CALL(test_sink, Log(absl::LogSeverity::kWarning, _, "Hello world"));
test_sink.StartCapturingLogs();
LOG(WARNING) << "Hello world";
}
TEST(LogHygieneTest, WorksWithAlternativeERRORSymbol) {
const double ERROR ABSL_ATTRIBUTE_UNUSED = 7.77;
absl::ScopedMockLog test_sink(absl::MockLogDefault::kDisallowUnexpected);
EXPECT_CALL(test_sink, Log(absl::LogSeverity::kError, _, "Hello world"));
test_sink.StartCapturingLogs();
LOG(ERROR) << "Hello world";
}
TEST(LogHygieneTest, WorksWithAlternativeLEVELSymbol) {
const double LEVEL ABSL_ATTRIBUTE_UNUSED = 7.77;
absl::ScopedMockLog test_sink(absl::MockLogDefault::kDisallowUnexpected);
EXPECT_CALL(test_sink, Log(absl::LogSeverity::kError, _, "Hello world"));
test_sink.StartCapturingLogs();
LOG(LEVEL(absl::LogSeverity::kError)) << "Hello world";
}
#define INFO Bogus
#ifdef NDEBUG
constexpr bool IsOptimized = false;
#else
constexpr bool IsOptimized = true;
#endif
TEST(LogHygieneTest, WorksWithINFODefined) {
absl::ScopedMockLog test_sink(absl::MockLogDefault::kDisallowUnexpected);
EXPECT_CALL(test_sink, Log(absl::LogSeverity::kInfo, _, "Hello world"))
.Times(2 + (IsOptimized ? 2 : 0));
test_sink.StartCapturingLogs();
LOG(INFO) << "Hello world";
LOG_IF(INFO, true) << "Hello world";
DLOG(INFO) << "Hello world";
DLOG_IF(INFO, true) << "Hello world";
}
#undef INFO
#define _INFO Bogus
TEST(LogHygieneTest, WorksWithUnderscoreINFODefined) {
absl::ScopedMockLog test_sink(absl::MockLogDefault::kDisallowUnexpected);
EXPECT_CALL(test_sink, Log(absl::LogSeverity::kInfo, _, "Hello world"))
.Times(2 + (IsOptimized ? 2 : 0));
test_sink.StartCapturingLogs();
LOG(INFO) << "Hello world";
LOG_IF(INFO, true) << "Hello world";
DLOG(INFO) << "Hello world";
DLOG_IF(INFO, true) << "Hello world";
}
#undef _INFO
TEST(LogHygieneTest, ExpressionEvaluationInLEVELSeverity) {
auto i = static_cast<int>(absl::LogSeverity::kInfo);
LOG(LEVEL(++i)) << "hello world"; // NOLINT
EXPECT_THAT(i, Eq(static_cast<int>(absl::LogSeverity::kInfo) + 1));
}
TEST(LogHygieneTest, ExpressionEvaluationInStreamedMessage) {
int i = 0;
LOG(INFO) << ++i;
EXPECT_THAT(i, 1);
LOG_IF(INFO, false) << ++i;
EXPECT_THAT(i, 1);
}
// Tests that macros are usable in unbraced switch statements.
// -----------------------------------------------------------
class UnbracedSwitchCompileTest {
static void Log() {
switch (0) {
case 0:
LOG(INFO);
break;
default:
break;
}
}
};
} // namespace
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