def test_revision_extra_headers_in_metadata_from_dict(): rev_dict = revision_example.copy() rev_dict.pop("id") rev_dict["metadata"] = { "something": "somewhere", "some other thing": "stranger", } extra_headers = ( (b"header1", b"value1"), (b"header2", b"42"), (b"header3", b"should I?\nmaybe\x00\xff"), (b"header1", b"again"), ) # check the bw-compat init hook does the job rev_dict["metadata"]["extra_headers"] = extra_headers > rev_model = Revision.from_dict(rev_dict) .tox/py3/lib/python3.7/site-packages/swh/model/tests/test_model.py:587: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ .tox/py3/lib/python3.7/site-packages/swh/model/model.py:507: in from_dict **d, <attrs generated init swh.model.model.Revision>:28: in __init__ self.__attrs_post_init__() _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ self = Revision(message=b'Linux 4.2-rc2\n', author=Person(fullname=b'Linus Torvalds <torvalds@linux-foundation.org>', name=b'...4]\xb5\xec\xb3\x1e\x9d\xe8\x08',), id=b'\xe6\xdcC\xfb0,\xcd)\xba\xb9\x1b(\xcf\x0e\xf7[\x14\x8f\xd5>', extra_headers=()) def __attrs_post_init__(self): super().__attrs_post_init__() # ensure metadata is a deep copy of whatever was given, and if needed # extract extra_headers from there if self.metadata: metadata = deepcopy(self.metadata) if not self.extra_headers and "extra_headers" in metadata: object.__setattr__( self, "extra_headers", > tuplify_extra_headers(metadata.pop("extra_headers")), ) E AttributeError: 'ImmutableDict' object has no attribute 'pop' .tox/py3/lib/python3.7/site-packages/swh/model/model.py:480: AttributeError