Add basic tests

YesNt.Interpreter.Tests/YesNtAssert.cs

@@ -0,0 +1,63 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+using System;
+using System.Collections.Generic;
+using System.Threading;
+
+using YesNt.Interpreter.Runtime;
+
+namespace YesNt.Interpreter.Tests;
+
+internal static class YesNtAssert
+{
+    private static readonly YesNtInterpreter yesNtInterpreter = new YesNtInterpreter();
+
+    static YesNtAssert()
+    {
+        yesNtInterpreter.Initialize();
+    }
+
+    public static void IsLastLineEqual(List<string> lines, string expected, int timeout = 1000)
+    {
+        AutoResetEvent onDone = new AutoResetEvent(false);
+
+        DebugEventArgs debugEventArgs = new DebugEventArgs();
+        yesNtInterpreter.OnLineExecuted += (er) =>
+        {
+            debugEventArgs = er ?? debugEventArgs;
+
+            if (er is null)
+            {
+                onDone.Set();
+            }
+        };
+
+        yesNtInterpreter.Execute(lines, true);
+
+        _ = onDone.WaitOne(TimeSpan.FromSeconds(timeout));
+
+        Assert.AreEqual(expected, debugEventArgs.CurrentLine);
+    }
+
+    public static void IsLineEqual(string line, string expected, int timeout = 1000)
+    {
+        AutoResetEvent onDone = new AutoResetEvent(false);
+        List<string> lines = new List<string>()
+        {
+           line
+        };
+
+        DebugEventArgs debugEventArgs = new DebugEventArgs();
+        yesNtInterpreter.OnLineExecuted += (er) =>
+        {
+            debugEventArgs = er ?? debugEventArgs;
+            onDone.Set();
+        };
+
+        yesNtInterpreter.Execute(lines, true);
+
+        _ = onDone.WaitOne(TimeSpan.FromMilliseconds(timeout));
+
+        Assert.AreEqual(expected, debugEventArgs.CurrentLine);
+    }
+}