libcryfs/test/cpp-utils/logging/LoggingTest.cpp

#include "testutils/LoggingTest.h"

/*
 * Contains test cases for the following logging interface:
 *   LOG(INFO) << "My log message"
 */

using namespace cpputils::logging;
using std::string;
using testing::MatchesRegex;

TEST_F(LoggingTest, DefaultLoggerIsStderr) {
    string output = captureStderr([]{
        LOG(INFO) << "My log message";
    });
    EXPECT_THAT(output, MatchesRegex(".*\\[Log\\].*\\[info\\].*My log message.*"));
}

TEST_F(LoggingTest, SetLogger_NewLoggerIsUsed) {
    setLogger(spdlog::stderr_logger_mt("MyTestLog2"));
    string output = captureStderr([]{
        LOG(INFO) << "My log message";
    });
    EXPECT_THAT(output, MatchesRegex(".*\\[MyTestLog2\\].*\\[info\\].*My log message.*"));
}

TEST_F(LoggingTest, SetNonStderrLogger_LogsToNewLogger) {
    setLogger(mockLogger.get());
    logger()->info() << "My log message";
    EXPECT_THAT(mockLogger.capturedLog(), MatchesRegex(".*\\[MockLogger\\].*\\[info\\].*My log message.*"));
}

TEST_F(LoggingTest, SetNonStderrLogger_DoesNotLogToStderr) {
    setLogger(mockLogger.get());
    string output = captureStderr([] {
        logger()->info() << "My log message";
    });
    EXPECT_EQ("", output);
}

TEST_F(LoggingTest, InfoLog) {
    setLogger(mockLogger.get());
    LOG(INFO) << "My log message";
    EXPECT_THAT(mockLogger.capturedLog(), MatchesRegex(".*\\[MockLogger\\].*\\[info\\].*My log message.*"));
}

TEST_F(LoggingTest, WarningLog) {
    setLogger(mockLogger.get());
    LOG(WARN) << "My log message";
    EXPECT_THAT(mockLogger.capturedLog(), MatchesRegex(".*\\[MockLogger\\].*\\[warning\\].*My log message.*"));
}

TEST_F(LoggingTest, DebugLog) {
    setLevel(DEBUG);
    setLogger(mockLogger.get());
    LOG(DEBUG) << "My log message";
    EXPECT_THAT(mockLogger.capturedLog(), MatchesRegex(".*\\[MockLogger\\].*\\[debug\\].*My log message.*"));
}

TEST_F(LoggingTest, ErrorLog) {
    setLogger(mockLogger.get());
    LOG(ERROR) << "My log message";
    EXPECT_THAT(mockLogger.capturedLog(), MatchesRegex(".*\\[MockLogger\\].*\\[error\\].*My log message.*"));
}

void logAndExit(const string &message) {
    LOG(INFO) << message;
    exit(1);
}

// fork() only forks the main thread. This test ensures that logging doesn't depend on threads that suddenly aren't
// there anymore after a fork().
TEST_F(LoggingTest, LoggingAlsoWorksAfterFork) {
    setLogger(spdlog::stderr_logger_mt("StderrLogger"));
    EXPECT_EXIT(
        logAndExit("My log message"),
        ::testing::ExitedWithCode(1),
        "My log message"
    );
}