def matrix(self):
        return quaternion_matrix(self._qnow)
Test that items can be added and retrieved from inventory
dataset/ETHPy150Open IEEERobotics/bot/bot/hardware/complex_hardware/transformations.py/Arcball.matrix--crossover with--dataset/ETHPy150Open tuturto/pyherc/src/pyherc/test/unit/test_inventory.py/TestInventory.test_accessing_items