tested #moveXmark when the it is on the first tile of a board greater than 2x2
Added a lot of tests to #moveXmark. Begin to refactor
Implemented #testCoordinateDoesNotChange to save testing time
Implemented #testCoordinateChange
refactoring of #testCoordinateChange complete
Finished refactoring #moveXmark specs to use #testCoordinateChange and #testCoordinateDoesNotChange