Added missing test file

tests/test_file_logging.cpp

+/*
+ * This content is released under the MIT License as specified in https://raw.githubusercontent.com/gabime/spdlog/master/LICENSE
+ */
+#include "includes.h"
+
+TEST_CASE("simple_file_logger", "[simple_logger]]")
+{
+    prepare_logdir();
+    std::string filename = "logs/simple_log";
+
+    auto logger = spdlog::create<spdlog::sinks::basic_file_sink_mt>("logger", filename);
+    logger->set_pattern("%v");
+
+    logger->info("Test message {}", 1);
+    logger->info("Test message {}", 2);
+
+    logger->flush();
+    REQUIRE(file_contents(filename) == std::string("Test message 1\nTest message 2\n"));
+    REQUIRE(count_lines(filename) == 2);
+}
+
+TEST_CASE("flush_on", "[flush_on]]")
+{
+    prepare_logdir();
+    std::string filename = "logs/simple_log";
+
+    auto logger = spdlog::create<spdlog::sinks::basic_file_sink_mt>("logger", filename);
+    logger->set_pattern("%v");
+    logger->set_level(spdlog::level::trace);
+    logger->flush_on(spdlog::level::info);
+    logger->trace("Should not be flushed");
+    REQUIRE(count_lines(filename) == 0);
+
+    logger->info("Test message {}", 1);
+    logger->info("Test message {}", 2);
+
+    REQUIRE(file_contents(filename) == std::string("Should not be flushed\nTest message 1\nTest message 2\n"));
+    REQUIRE(count_lines(filename) == 3);
+}
+
+TEST_CASE("rotating_file_logger1", "[rotating_logger]]")
+{
+    prepare_logdir();
+    size_t max_size = 1024 * 10;
+    std::string basename = "logs/rotating_log";
+    auto logger = spdlog::rotating_logger_mt("logger", basename, max_size, 0);
+
+    for (int i = 0; i < 10; ++i)
+    {
+        logger->info("Test message {}", i);
+    }
+
+    logger->flush();
+    auto filename = basename;
+    REQUIRE(count_lines(filename) == 10);
+}
+
+TEST_CASE("rotating_file_logger2", "[rotating_logger]]")
+{
+    prepare_logdir();
+    size_t max_size = 1024 * 10;
+    std::string basename = "logs/rotating_log";
+    auto logger = spdlog::rotating_logger_mt("logger", basename, max_size, 1);
+    for (int i = 0; i < 10; ++i)
+    {
+        logger->info("Test message {}", i);
+    }
+
+    logger->flush();
+    auto filename = basename;
+    REQUIRE(count_lines(filename) == 10);
+    for (int i = 0; i < 1000; i++)
+    {
+
+        logger->info("Test message {}", i);
+    }
+
+    logger->flush();
+    REQUIRE(get_filesize(filename) <= max_size);
+    auto filename1 = basename + ".1";
+    REQUIRE(get_filesize(filename1) <= max_size);
+}
+
+TEST_CASE("daily_logger with dateonly calculator", "[daily_logger_dateonly]]")
+{
+    using sink_type = spdlog::sinks::daily_file_sink<std::mutex, spdlog::sinks::daily_filename_calculator>;
+
+    prepare_logdir();
+    // calculate filename (time based)
+    std::string basename = "logs/daily_dateonly";
+    std::tm tm = spdlog::details::os::localtime();
+    fmt::memory_buffer w;
+    fmt::format_to(w, "{}_{:04d}-{:02d}-{:02d}", basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
+
+    auto logger = spdlog::create<sink_type>("logger", basename, 0, 0);
+    for (int i = 0; i < 10; ++i)
+    {
+
+        logger->info("Test message {}", i);
+    }
+    logger->flush();
+    auto filename = fmt::to_string(w);
+    REQUIRE(count_lines(filename) == 10);
+}
+
+struct custom_daily_file_name_calculator
+{
+    static spdlog::filename_t calc_filename(const spdlog::filename_t &basename, const tm &now_tm)
+    {
+        fmt::memory_buffer w;
+        fmt::format_to(w, "{}{:04d}{:02d}{:02d}", basename, now_tm.tm_year + 1900, now_tm.tm_mon + 1, now_tm.tm_mday);
+        return fmt::to_string(w);
+    }
+};
+
+TEST_CASE("daily_logger with custom calculator", "[daily_logger_custom]]")
+{
+    using sink_type = spdlog::sinks::daily_file_sink<std::mutex, custom_daily_file_name_calculator>;
+
+    prepare_logdir();
+    // calculate filename (time based)
+    std::string basename = "logs/daily_dateonly";
+    std::tm tm = spdlog::details::os::localtime();
+    fmt::memory_buffer w;
+    fmt::format_to(w, "{}{:04d}{:02d}{:02d}", basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
+
+    auto logger = spdlog::create<sink_type>("logger", basename, 0, 0);
+    for (int i = 0; i < 10; ++i)
+    {
+        logger->info("Test message {}", i);
+    }
+
+    logger->flush();
+    auto filename = fmt::to_string(w);
+    REQUIRE(count_lines(filename) == 10);
+}
+
+/*
+ * File name calculations
+ */
+
+TEST_CASE("rotating_file_sink::calc_filename1", "[rotating_file_sink]]")
+{
+    auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename("rotated.txt", 3);
+    REQUIRE(filename == "rotated.3.txt");
+}
+
+TEST_CASE("rotating_file_sink::calc_filename2", "[rotating_file_sink]]")
+{
+    auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename("rotated", 3);
+    REQUIRE(filename == "rotated.3");
+}
+
+TEST_CASE("rotating_file_sink::calc_filename3", "[rotating_file_sink]]")
+{
+    auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename("rotated.txt", 0);
+    REQUIRE(filename == "rotated.txt");
+}
+
+// regex supported only from gcc 4.9 and above
+#if defined(_MSC_VER) || !(__GNUC__ <= 4 && __GNUC_MINOR__ < 9)
+#include <regex>
+
+TEST_CASE("daily_file_sink::daily_filename_calculator", "[daily_file_sink]]")
+{
+    // daily_YYYY-MM-DD_hh-mm.txt
+    auto filename = spdlog::sinks::daily_filename_calculator::calc_filename("daily.txt", spdlog::details::os::localtime());
+    // date regex based on https://www.regular-expressions.info/dates.html
+    std::regex re(R"(^daily_(19|20)\d\d-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])\.txt$)");
+    std::smatch match;
+    REQUIRE(std::regex_match(filename, match, re));
+}
+#endif