Added isFreePosition() with first test case when position is filled

src/main/java/de/tims/fleetstorm/matchfield/Matchfield.java

@@ -110,4 +110,22 @@ public class Matchfield {
 		return shipCounter == 0;
 	}
 
+	public boolean isFreePosition(Coordinate next, int length, int direction) {
+
+		for (int i = 0; i < length; i++) {
+
+			if (this.getState(next.getX(), next.getY()) != Coordinate.EMPTY)
+				return false;
+
+			if (direction == 0) {
+
+				next = new Coordinate(next.getX() + i, next.getY());
+			} else if (direction == 1) {
+				next = new Coordinate(next.getX(), next.getY() + i);
+			}
+		}
+
+		return true;
+	}
+
 }

src/test/java/de/tims/fleetstorm/matchfield/MatchfieldShipTest.java

@@ -130,4 +130,14 @@ class MatchfieldShipTest {
 		boolean calulatedResult = matchfield.areAllShipsHit();
 		assertFalse(calulatedResult);
 	}
+
+	@Test
+	void testMatchfieldIsFreePositionWithNonFreeField() {
+		Matchfield matchfield = new Matchfield(10);
+		matchfield.createMatchfield();
+		matchfield.setState(new Coordinate(0, 0), Coordinate.SHIP);
+
+		boolean calculatedResult = matchfield.isFreePosition(new Coordinate(0, 0), 2, 1);
+		assertFalse(calculatedResult);
+	}
 }