Add test covering an expected behaviour from pre 3.15, where update views don't have to define a queryset attribute or get_queryset method. The behaviour regressed in 3.15 and the change was reverted in 3.15.1. However, it's a behaviour users care about which isn't covered by the test suite.
Description
Add test covering an expected behaviour from pre 3.15, where update views don't have to define a
querysetattribute orget_querysetmethod. The behaviour regressed in 3.15 and the change was reverted in 3.15.1. However, it's a behaviour users care about which isn't covered by the test suite.