fix(sdk): Remove instanceof check. Aligned structuring of tests with …

…arrange, act, assert principle

python/tests/test_user.py

@@ -56,16 +56,15 @@ def test_user_collection_property_uses_user_id(
     user = User(id=mock_id, name="John Doe", _client=mock_graphql_client)
 
     assert user.collection is not None
-
     assert user.collection.key == mock_key
 
 
 def test_from_user_info_returns_user_with_correct_attributes(
     mock_graphql_client: GraphQLClient,
 ) -> None:
     user_info = {"user_id": mock_id, "name": "Jane Smith"}
+
     user = User.from_user_info(user_info, _client=mock_graphql_client)
 
     assert user.id == mock_id
-
     assert user.name == "Jane Smith"

python/tests/test_user_session.py

@@ -43,7 +43,9 @@ def test_user_property_raises_value_error_when_no_cookie(
     mock_graphql_client: GraphQLClient,
 ) -> None:
     cg = CookieGetterStub({})
+
     session = Session(cg, _client=mock_graphql_client)
+
     with pytest.raises(
         ValueError, match="Invalid user info in cookie or cookie is missing"
     ):
@@ -60,10 +62,6 @@ def test_user_property_returns_user_when_valid_cookie(
 
     session = Session(cg, _client=mock_graphql_client)
 
-    assert isinstance(session.user, User)
-
     assert session.user is not None
-
     assert session.user.id == "1"
-
     assert session.user.name == "Test User"