feat: add fail test.

tests/HeadlessTest.Ursa/Controls/PinCodeTests/PasteTest.cs

@@ -3,6 +3,7 @@ using Avalonia.Headless;
 using Avalonia.Headless.XUnit;
 using Avalonia.Input;
 using Avalonia.Threading;
+using CommunityToolkit.Mvvm.Input;
 using Ursa.Controls;
 
 namespace HeadlessTest.Ursa.Controls.PinCodeTests;
@@ -13,9 +14,11 @@ public class PasteTest
     public async void Paste_Should_Insert_Text()
     {
         var window = new Window();
+        bool commandInvoked = false;
         var pinCode = new PinCode()
         {
             Count = 4,
+            CompleteCommand = new RelayCommand(() => commandInvoked = true),
         };
         window.Content = pinCode;
         window.Show();
@@ -27,15 +30,18 @@ public class PasteTest
         // add await for clipboard processing. 
         await Task.Delay(1);
         Assert.Equal("abcd", string.Join("", pinCode.Digits));
+        Assert.True(commandInvoked);
     }
     
     [AvaloniaFact]
     public async void Paste_Should_Insert_Text_When_Text_Is_Shorter()
     {
         var window = new Window();
+        bool commandInvoked = false;
         var pinCode = new PinCode()
         {
             Count = 4,
+            CompleteCommand = new RelayCommand(() => commandInvoked = true),
         };
         window.Content = pinCode;
         window.Show();
@@ -46,15 +52,18 @@ public class PasteTest
         window.KeyPressQwerty(PhysicalKey.V, RawInputModifiers.Control);
         await Task.Delay(1);
         Assert.Equal("abc", string.Join("", pinCode.Digits));
+        Assert.False(commandInvoked);
     }
     
     [AvaloniaFact]
     public async void Paste_Should_Insert_Text_When_Text_Is_Longer()
     {
         var window = new Window();
+        bool commandInvoked = false;
         var pinCode = new PinCode()
         {
             Count = 4,
+            CompleteCommand = new RelayCommand(() => commandInvoked = true),
         };
         window.Content = pinCode;
         window.Show();
@@ -65,16 +74,19 @@ public class PasteTest
         window.KeyPressQwerty(PhysicalKey.V, RawInputModifiers.Control);
         await Task.Delay(1);
         Assert.Equal("abcd", string.Join("", pinCode.Digits));
+        Assert.True(commandInvoked);
     }
     
     [AvaloniaFact]
     public async void Paste_Should_Not_Insert_Text_When_Text_Is_In_Invalid_Mode()
     {
         var window = new Window();
+        var commandInvoked = false;
         var pinCode = new PinCode()
         {
             Count = 4,
             Mode = PinCodeMode.Digit,
+            CompleteCommand = new RelayCommand(() => commandInvoked = true),
         };
         window.Content = pinCode;
         window.Show();
@@ -85,5 +97,6 @@ public class PasteTest
         window.KeyPressQwerty(PhysicalKey.V, RawInputModifiers.Control);
         await Task.Delay(1);
         Assert.Equal("", string.Join("", pinCode.Digits));
+        Assert.False(commandInvoked);
     }
 }