WIP: submitting #4429

Tests/UnitTestsParallelizable/Application/TimeoutTests.cs

@@ -0,0 +1,51 @@
+#nullable enable
+using Xunit.Abstractions;
+
+namespace ApplicationTests.Timeout;
+
+/// <summary>
+///     Tests for timeout behavior with nested Application.Run() calls.
+///     These tests verify that timeouts scheduled in a parent run loop continue to fire
+///     correctly when a nested modal dialog is shown via Application.Run().
+/// </summary>
+public class TimeoutTests (ITestOutputHelper output)
+{
+    [Fact]
+    public void AddTimeout_Fires ()
+    {
+        IApplication app = Application.Create ();
+        app.Init ("fake");
+
+        uint timeoutTime = 100;
+        var timeoutFired = false;
+
+        // Setup a timeout that will fire
+        app.AddTimeout (
+                        TimeSpan.FromMilliseconds (timeoutTime),
+                        () =>
+                        {
+                            timeoutFired = true;
+
+                            // Return false so the timer does not repeat
+                            return false;
+                        }
+                       );
+
+        // The timeout has not fired yet
+        Assert.False (timeoutFired);
+
+        // Block the thread to prove the timeout does not fire on a background thread
+        Thread.Sleep ((int)timeoutTime * 2);
+        Assert.False (timeoutFired);
+
+        app.StopAfterFirstIteration = true;
+        app.Run<Runnable> ();
+
+        // The timeout should have fired
+        Assert.True (timeoutFired);
+
+        app.Dispose ();
+    }
+
+
+}