created test for checking WinningRestartBtn

src/test/java/Gui/ActionHandlerTest.java

@@ -17,6 +17,7 @@ class ActionHandlerTest {
         gui.StartMainMenu();
         gameGui.createGui();
         gameGui.createLosingPanel();
+        gameGui.createWinningPanel();
     }
 
     @Test
@@ -30,4 +31,16 @@ class ActionHandlerTest {
         //assert
         assertEquals(expectedNr, GameGui.questionNr);
     }
+    
+    @Test
+    public void testWinningRestartBtn() {
+        //arrange
+        int expectedNr = 1;
+        //act
+        GameGui.questionNr= 2;
+        ActionHandler actionHandler = new ActionHandler();
+        GameGui.WinningRestartBtn.doClick();
+        //assert
+        assertEquals(expectedNr, GameGui.questionNr);
+    }
 }