1) ./spec/mongoid/document_spec.rb[1:27:1:8:1]

Mongoid::Document#becomes when casting to a superclass when the document is invalid copies the errors

RSpec::Expectations::ExpectationNotMetError: expected #<ActiveModel::Errors:0x0000000009a54b10 @base=#<Person _id: 5cc8a89b1a58882e92c65d3d, username: "art...administrated_event_ids: nil, mother_id: nil, _type: "Person", level: 1>, @errors=[], @messages=nil> to include :ssn
Diff:
@@ -1,2 +1,6 @@
-[:ssn]
+#<ActiveModel::Errors:0x0000000009a54b10
+ @base=
+  #<Person _id: 5cc8a89b1a58882e92c65d3d, username: "arthurnn6", title: "Sir", terms: nil, pets: false, age: 100, dob: nil, employer_id: nil, lunch_time: nil, aliases: nil, map: nil, map_with_default: {}, score: nil, blood_alcohol_content: 0.0, last_drink_taken_at: 2019-04-29 00:00:00 UTC, ssn: "$$$", owner_id: nil, security_code: nil, reading: nil, bson_id: nil, pattern: nil, override_me: nil, at(aliased_timestamp): nil, t(test): nil, i(inte): nil, a(array): nil, desc: nil, test_array: nil, overridden_setter: nil, arrays: nil, range: nil, species: nil, preference_ids: nil, user_account_ids: nil, house_ids: nil, ordered_preference_ids: nil, administrated_event_ids: nil, mother_id: nil, _type: "Person", level: 1>,
+ @errors=[],
+ @messages=nil>