AttributeError: 'DockerVolume' object has no attribute 'volume'

[PriyaT113]

class Value():
def create(self):
self.volume=do_func()
def remove(self):
self.volume.remove()

mock Test:
class TestValue(unittest.Testcase):
@mock.patch("docker.client.DockerClient","remove",new_callable=PropertyMock())
def test_remove(self,docker_remove):
vol_obj=Value()
vol_obj.remove()

Output:
testtools.testresult.real._StringException: Traceback (most recent call last):
File "/usr/lib/python3.6/unittest/mock.py", line 1179, in patched
return func(*args, **keywargs)
File "/tmp/tox_env/collie/tests/volumes/test_base.py", line 36, in test_remove
vol_obj.remove()
File "/tmp/tox_env/collie/volumes/base.py", line 25, in remove
self.volume.remove(force=True)
AttributeError: 'DockerVolume' object has no attribute 'volume'