def test_parsing_invalid_command_raises_invalid_command():
assert_true(callable(command.parse("DANCE")))
def test_parsing_right_command_should_return_a_function():
assert_true(callable(command.parse("RIGHT")))
def test_parsing_place_command_with_bad_heading_should_raise_invalid_argument():
assert_true(callable(command.parse("PLACE 0,0,HOME")))
def test_parsing_place_command_with_no_arguments_should_raise_invalid_argument():
assert_true(callable(command.parse("PLACE")))
def test_parsing_place_command_should_return_a_function():
assert_true(callable(command.parse("PLACE 0,0,NORTH")))
def test_parsing_move_command_should_return_a_function():
assert_true(callable(command.parse("MOVE")))
def test_parsing_left_command_should_return_a_function():
assert_true(callable(command.parse("LEFT")))
