test: use not instead of is False in assert (#366)

* test: use == instead of is when comparing equality

* use not instead of ==

tests/unit/test_extended_operation.py

@@ -70,8 +70,8 @@ def make_extended_operation(responses=None):
 def test_constructor():
     ex_op, refresh, _ = make_extended_operation()
     assert ex_op._extended_operation == refresh.responses[0]
-    assert ex_op.cancelled() is False
-    assert ex_op.done() is False
+    assert not ex_op.cancelled()
+    assert not ex_op.done()
     assert ex_op.name == TEST_OPERATION_NAME
     assert ex_op.status == CustomOperation.StatusCode.PENDING
     assert ex_op.error_code is None