4gewinnt: updated mutltiple methods to deactivate buttons on full columns

src/main/java/de/tims/viergewinnt/ai/Logic.java

@@ -66,12 +66,18 @@ public class Logic {
 		int size = getBoardSize() - 1;
 		while(getField(size, column) != 0) {
 			size--;
+			if(size < 0) {
+				return -1;
+			}
 		}
 		return size;
 	}
 	
 	public int playChip(int column) {
 		setField(getCurrentPlayer(), getFreePlace(column), column);
+		if(getFreePlace(column) == -1) {
+			buttons[column].setEnabled(false);
+		}
 		updateGui();
 		if(testForWin()) {
 			gameover();
@@ -238,5 +244,9 @@ public class Logic {
 			setPlayer2Score(calcScore());
 		}
 		clearField();
+		for(int i = 0; i < getBoardSize(); i++) {
+			buttons[i].setEnabled(true);
+		}
+		updateGui();
 	}
 }

src/test/java/de/tims/viergewinnt/ai/LogicTest.java

@@ -181,6 +181,7 @@ class LogicTest {
 	@Test
 	void gameoverTest() {
 		testObj.setField(1, 0, 0);
+		testObj.create4gewinntGui();
 		
 		testObj.gameover();