created test for cheching same highscore

src/test/java/Gui/GameGuiTest.java

@@ -41,4 +41,12 @@ class GameGuiTest {
         assertEquals(expectedHighScore, gameGui.highScore);
     }
 	
+	@Test
+    public void testHighScoreSameScore() {
+        int expectedHighScore = 4;
+		gameGui.highScore = 4;
+        gameGui.questionNr = 4;
+        gameGui.highScore();
+        assertEquals(expectedHighScore, gameGui.highScore);
+    }
 }