code REORG, pour partage pkg version entre app et tests

src/PostIt/PostIt.Tests/UnitTest1.cs

@@ -0,0 +1,15 @@
+using Avalonia.Headless.XUnit;
+using PostIt.Views;
+
+namespace PostIt.Tests;
+
+public class MainPageTests
+{
+    [AvaloniaFact]
+    public void MainPage_Should_Load()
+    {
+        var window = new MainWindow();
+        window.Show();
+        Assert.NotNull(window);
+    }
+}