unit tests

PluginTestLibrary/_TestLogger.cs

@@ -0,0 +1,90 @@
+using FileFlows.Plugin;
+
+#if (DEBUG)
+
+namespace PluginTestLibrary;
+
+/// <summary>
+/// A logger for tests that stores the logs in memory
+/// </summary>
+public class TestLogger : ILogger
+{
+    private readonly List<string> Messages = new();
+
+    /// <summary>
+    /// Writes an information log message
+    /// </summary>
+    /// <param name="args">the log parameters</param>
+    public void ILog(params object[] args)
+        => Log(LogType.Info, args);
+
+    /// <summary>
+    /// Writes an debug log message
+    /// </summary>
+    /// <param name="args">the log parameters</param>
+    public void DLog(params object[] args)
+        => Log(LogType.Debug, args);
+
+    /// <summary>
+    /// Writes an warning log message
+    /// </summary>
+    /// <param name="args">the log parameters</param>
+    public void WLog(params object[] args)
+        => Log(LogType.Warning, args);
+
+    /// <summary>
+    /// Writes an error log message
+    /// </summary>
+    /// <param name="args">the log parameters</param>
+    public void ELog(params object[] args)
+        => Log(LogType.Error, args);
+
+    /// <summary>
+    /// Gets the tail of the log
+    /// </summary>
+    /// <param name="length">the number of messages to get</param>
+    public string GetTail(int length = 50)
+    {
+        if (Messages.Count <= length)
+            return string.Join(Environment.NewLine, Messages);
+        return string.Join(Environment.NewLine, Messages.TakeLast(50));
+    }
+
+    /// <summary>
+    /// Logs a message
+    /// </summary>
+    /// <param name="type">the type of log to record</param>
+    /// <param name="args">the arguments of the message</param>
+    private void Log(LogType type, params object[] args)
+    {
+        string message = type + " -> " + string.Join(", ", args.Select(x =>
+            x == null ? "null" :
+            x.GetType().IsPrimitive ? x.ToString() :
+            x is string ? x.ToString() :
+            System.Text.Json.JsonSerializer.Serialize(x)));
+        Writer?.Invoke(message);
+        Messages.Add(message);
+    }
+
+    /// <summary>
+    /// Gets or sets an optional writer
+    /// </summary>
+    public Action<string> Writer { get; set; } = null!;
+
+    /// <summary>
+    /// Returns the entire log as a string
+    /// </summary>
+    /// <returns>the entire log</returns>
+    public override string ToString()
+        => string.Join(Environment.NewLine, Messages);
+
+    /// <summary>
+    /// Checks if the log contains the text
+    /// </summary>
+    /// <param name="text">the text to check for</param>
+    /// <returns>true if it contains it, otherwise false</returns>
+    public bool Contains(string text)
+        => Messages.Any(x => x.Contains(text));
+}
+
+#endif