fix: AccessEntry API representation parsing (#1682)

* fix: AccessEntry API representation parsing

Overriding the `AccessEntry#_properties` with a deep copy of the API resource overwrites the `role` property set in `AccessEntry.__init__` which isn't present in the resource if the `role` is set to `None`. This causes `AccessEntry`s generated from API representations to no longer evaluate to equal with equivalent `AccessEntry` resources instantiated through `AccessEntry.__init__`. The added unit test fails without the change and passes with the change.

* build: formatting

---------

Co-authored-by: Lingqing Gan <lingqing.gan@gmail.com>

google/cloud/bigquery/dataset.py

@@ -501,9 +501,7 @@ def from_api_repr(cls, resource: dict) -> "AccessEntry":
         if len(entry) != 0:
             raise ValueError("Entry has unexpected keys remaining.", entry)
 
-        config = cls(role, entity_type, entity_id)
-        config._properties = copy.deepcopy(resource)
-        return config
+        return cls(role, entity_type, entity_id)
 
 
 class Dataset(object):

tests/unit/test_dataset.py

@@ -152,6 +152,22 @@ def test_from_api_repr_w_unknown_entity_type(self):
         exp_resource = entry.to_api_repr()
         self.assertEqual(resource, exp_resource)
 
+    def test_from_api_repr_wo_role(self):
+        resource = {
+            "view": {
+                "projectId": "my-project",
+                "datasetId": "my_dataset",
+                "tableId": "my_table",
+            }
+        }
+        entry = self._get_target_class().from_api_repr(resource)
+        exp_entry = self._make_one(
+            role=None,
+            entity_type="view",
+            entity_id=resource["view"],
+        )
+        self.assertEqual(entry, exp_entry)
+
     def test_to_api_repr_w_extra_properties(self):
         resource = {
             "role": "READER",