public void IsValidMoveTest(int x1, int y1, int x2, int y2, bool expected)
{
// Arrange
Board board = new Board(true);
var bishop = new Bishop(true, 0, 0);
// Act
var result = bishop.IsValidMove(0, 0, x2, y2, board.Turn, board);
// Assert
Assert.AreEqual(expected, result);
}