'add_random_90degrees_rotation
Randomly perform 90 degrees rotations.
Arguments:
rotations: `list`. Allowed 90 degrees rotations.
Return:
Nothing.'

def add_random_90degrees_rotation(self, rotations=[0, 1, 2, 3]):

    self.methods.append(self._random_90degrees_rotation)
    self.args.append([rotations])
