cpp-logger/test/logger_test.cxx

//
//  logger_test.cxx
//  logger
//
//  Created by Sam Jaffe on 3/31/19.
//

#include <gmock/gmock.h>

#include "logger/logger.h"
#include "logger/logger_impl.h"

namespace logging {
  void PrintTo(location_info const & info, std::ostream * os) {
    if (info.line) {
      (*os) << "{\"" << info.filename << "\", \"" <<
          info.function << "\", " << info.line << "}";
    } else {
      (*os) << "NULL";
    }
  }
  void PrintTo(logpacket const & pkt, std::ostream * os) {
    (*os) << "{ " << pkt.level << ", ";
    PrintTo(pkt.info, os);
    (*os) << ", \"" << pkt.logger << "\", \"" << pkt.message << "\" }";
  }
}

struct MockLoggerImpl : public logging::logger_impl {
  MockLoggerImpl() {
    SetLogLevel(logging::LTRACE);
  }
  void SetLogLevel(logging::log_level ll) {
    min_log_level = ll;
  }
  MOCK_METHOD0(flush, void());
  MOCK_METHOD1(write, void(logging::logpacket const &));
  MOCK_METHOD2(write, void(logging::log_level, std::string const &));
};

struct LoggerTest : public testing::Test {
  void SetUp() override;
  void TearDown() override;

  std::shared_ptr<MockLoggerImpl> pimpl;
};

using namespace logging;

struct t_logger : public logger {
  t_logger(std::string const & name, std::shared_ptr<logger_impl> impl)
  : logger(name, impl) {}
};

void LoggerTest::SetUp() {
  pimpl.reset(new MockLoggerImpl);
  using testing::AnyNumber;
  EXPECT_CALL(*pimpl, flush()).Times(AnyNumber());
}

void LoggerTest::TearDown() {
  pimpl.reset();
}

TEST_F(LoggerTest, LogsWithBraceFmtCode) {
  using testing::Field;
  EXPECT_CALL(*pimpl, write(Field(&logpacket::message, "5"))).Times(1);
  t_logger("", pimpl).log(LERROR, "{}", 5);
}

TEST_F(LoggerTest, DoesNotLogAboveLevel) {
  using testing::_;
  pimpl->SetLogLevel(LFATAL);
  EXPECT_CALL(*pimpl, write(_)).Times(0);
  t_logger("", pimpl).log(LERROR, "{}", 5);
}

TEST_F(LoggerTest, LogCurlyBraceLiteralByDoubling) {
  using testing::Field;
  EXPECT_CALL(*pimpl, write(Field(&logpacket::message, "{}"))).Times(1);
  t_logger("", pimpl).log(LERROR, "{{}}", 5);
}