Since #16700, the following AboutIntegrationTest fails intermittently:

AboutIntegrationTest.test_0002_about page proxies should have version
not all expectations were satisfied
unsatisfied expectations:
- expected at least once, not yet invoked: #<AnyInstance:ComputeResource(id: integer, name: string, description: text, url: string, user: string, password: text, uuid: string, type: string, created_at: datetime, updated_at: datetime, attrs: text)>.ping(any_parameters)
- expected at least once, not yet invoked: #<Mock:ProxyStatus::Version>.version(any_parameters)
- expected at least once, not yet invoked: #<AnyInstance:SmartProxy(id: integer, name: string, url: string, created_at: datetime, updated_at: datetime, expired_logs: string)>.statuses(any_parameters)
 (Minitest::Assertion)
/var/lib/workspace/workspace/test_develop_pr_core/database/postgresql/ruby/2.0.0/slave/fast/test/integration/about_test.rb:5    

(took 8.3 sec)

Possibly the test is completing the AJAX calls have started, so the expectations on the AJAX calls themselves are never satisfied.