add getAbove() in Matchfield - DefaultCase

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

@@ -32,4 +32,16 @@ public class Matchfield {
 		this.matchfield[x][y].setState(state);
 	}
 
+	public Coordinate getAbove(Coordinate center) {
+		return this.matchfield[center.getX() + 1][center.getY()];
+	}
+
+	public Coordinate getField(Coordinate coordinate) {
+		return matchfield[coordinate.getX()][coordinate.getY()];
+	}
+
+	public Coordinate getField(int x, int y) {
+		return matchfield[x][y];
+	}
+
 }

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

@@ -43,4 +43,5 @@ class CoordinateTest {
 				Arguments.of("State = HIT", 3, Coordinate.HIT, Coordinate.HIT),
 				Arguments.of("State = EMPTY", 0, Coordinate.EMPTY, Coordinate.EMPTY));
 	}
+
 }

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

@@ -63,4 +63,17 @@ class MatchfieldCreationTest {
 		return Stream.of(
 				Arguments.of("field x:0 y:0 has state SHIP after setState()", 0, 0, Coordinate.SHIP, Coordinate.SHIP));
 	}
+
+	@ParameterizedTest(name = "Get the Coordinate above")
+	@MethodSource("getCoordinateAbove")
+	void testGetAbove(String testName, Matchfield matchfield, Coordinate center, Coordinate expectedResult) {
+
+		Coordinate result = matchfield.getAbove(center);
+		assertThat(result).describedAs(testName).isEqualTo(expectedResult);
+	}
+
+	static Stream<Arguments> getCoordinateAbove() {
+		Matchfield matchfield = new Matchfield(10);
+		return Stream.of(Arguments.of("above from (5/5)", matchfield, new Coordinate(5, 5), matchfield.getField(6, 5)));
+	}
 }