create Test for CloseBtn

src/test/java/Gui/guiTest.java

@@ -26,12 +26,15 @@ class guiTest {
 	public void testCreateButtons() {
 		//arrange
 		String Start = "Starte Spiel";
+		String Close = "Schließen";
 		
 		//act
 		String StartTarget = gui.StartBtn.getText();
+		String CloseTarget = gui.CloseBtn.getText();
 
 		//assert
 	    assertEquals(Start,StartTarget);
+	    assertEquals(Close,CloseTarget);
 	}