4gewinnt: added getter method for board size

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

@@ -30,6 +30,10 @@ public class Logic {
 		return board[row][column];
 	}
 	
+	public int getBoardSize() {
+		return 6;
+	}
+	
 	public void setCurrentPlayer(int player) {
 		currentPlayer = player;
 	}

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

@@ -169,6 +169,14 @@ class LogicTest {
 		assertEquals(expectedResult.getClass(), realResult.getClass());
 	}
 	
+	@Test
+	void getBoardSize() {
+		int expectedResult = 6;
+		int realResult = testObj.getBoardSize();
+		
+		assertEquals(expectedResult, realResult);
+	}
+	
 	private static Stream<Arguments> playfieldResults() {
 		int[][] playfield1 = {{0, 0, 0, 0, 0, 0}, 
 				   			  {0, 0, 0, 0, 0, 0},