@Test public void testBorders() { Set<Tile> border = testPiece.getBorderUp(); assertTrue(border.contains(new Tile(0, 2))); border = testPiece.getBorderDown(); assertTrue(border.contains(new Tile(1, -1))); border = testPiece.getBorderLeft(); assertTrue(border.contains(new Tile(-1, 0))); border = testPiece.getBorderRight(); assertTrue(border.contains(new Tile(1, 1))); }