allow_any_instance_of(Object).to receive(:sleep) failure

[rdh]

After adding buildkite-test_collector to our Gemfile, specs that stub sleep in this way...

allow_any_instance_of(Object).to receive(:sleep)

... have begun failing with this error message...

Failure/Error: allow_any_instance_of(Object).to receive(:sleep)
       Using `any_instance` to stub a method (sleep) that has been defined on a prepended module (Buildkite::TestCollector::Object::CustomObjectSleep) is not supported.

... under rspec (3.10.0) and rspec-rails (5.0.0)

[gchan]

When we initially built the collector, we didn't consider use cases where sleep is stubbed this way because allow_any_instance_of is generally not a recommended practice any more.

We may look to support this better in the future but you could try stubbing the class under test like this:

allow_any_instance_of(TheClassUnderTest).to receive(:sleep)

Another customer encountered this same problem and this resolved their issue.

Thanks!

[JuanitoFatas]

GitLab had a similar issue and their solution is to use a custom matcher, maybe this may work for you?

[gchan]

@rdh 👆️

[rdh]

Just a follow-up. The failures were easily resolved with...

allow_any_instance_of(TheClassUnderTest).to receive(:sleep)

Would still be ideal if this gem "just worked" as a drop-in to legacy repos, but pretty minor.