@Test
public void testPlaceShip() throws ShipTooCloseException {
Coordinate[] shipCoordinates = new Coordinate[] {new Coordinate(1, 1)};
battlefield.placeShip(shipCoordinates);
assertArrayEquals(new Boolean[] {true}, battlefield.getShipsByCoordinates(shipCoordinates));
}
@Test
public void testInitiallyNoShips() {
assertArrayEquals(
new Boolean[] {false, false, false, false}, battlefield.getShipsByCoordinates(coordinates));
}