Added Unit tests for Logger

Tests/Tests.DiscordBotCore.Logging/LoggerTests.cs

@@ -0,0 +1,46 @@
+using DiscordBotCore.Logging;
+
+namespace Tests.DiscordBotCore.Logging;
+
+public class LoggerTests
+{
+    private readonly string logFolder = Path.GetTempPath();
+    private readonly string format = "{Message} | {SenderName} | {LogMessageType}";
+
+    [Fact]
+    public void Log_AddsMessageToList()
+    {
+        ILogger logger = new Logger(logFolder, format, maxHistorySize: 5);
+
+        logger.Log("Test message");
+
+        Assert.Single(logger.LogMessages);
+        Assert.Equal("Test message", logger.LogMessages[0].Message);
+    }
+
+    [Fact]
+    public void Log_TriggersOnLogReceived()
+    {
+        ILogger logger = new Logger(logFolder, format, maxHistorySize: 5);
+        bool triggered = false;
+        logger.OnLogReceived += (_) => triggered = true;
+
+        logger.Log("Test message");
+
+        Assert.True(triggered);
+    }
+
+    [Fact]
+    public void Log_RespectsMaxHistorySize()
+    {
+        ILogger logger = new Logger(logFolder, format, maxHistorySize: 3);
+
+        logger.Log("1");
+        logger.Log("2");
+        logger.Log("3");
+        logger.Log("4");
+
+        Assert.Equal(3, logger.LogMessages.Count);
+        Assert.DoesNotContain(logger.LogMessages, m => m.Message == "1");
+    }
+}