public void TestFileLogging()
        {
            using (var fileProvider = new FileProvider("./test.txt", true))
            {
                TheLog.AddProvider(fileProvider, LogLevel.Info);
                _logger.Info("Info");   // will be shown
                _logger.Trace("Trace"); // will be ignored
                _logger.Error("Error"); // will be shown
            }

            var lines = File.ReadAllLines("./test.txt");

            Assert.AreEqual(2, lines.Length);
            Assert.IsTrue(lines[0].Contains("Info"));
            Assert.IsTrue(lines[1].Contains("Error"));
            TheLog.ClearProviders();

            using (var fileProvider = new FileProvider("./test.txt", false))
            {
                TheLog.AddProvider(fileProvider, LogLevel.Info);
                _logger.Info("Info");   // will be shown
                _logger.Trace("Trace"); // will be ignored
                _logger.Error("Error"); // will be shown
            }

            lines = File.ReadAllLines("./test.txt");
            Assert.AreEqual(4, lines.Length);
            TheLog.ClearProviders();

            using (var fileProvider = new FileProvider("./test.txt", true))
            {
                TheLog.AddProvider(fileProvider, LogLevel.Info);
                _logger.Info("Info");   // will be shown
                _logger.Trace("Trace"); // will be ignored
                _logger.Error("Error"); // will be shown
            }

            lines = File.ReadAllLines("./test.txt");
            Assert.AreEqual(2, lines.Length);
            TheLog.ClearProviders();
        }