Why is it a code smell to use any_instance_of in Rspec? -


there aren't many resources online closest answer on relishapp.com website:

the rspec-mocks api designed individual object instances, feature operates on entire classes of objects. result there semantically confusing edge cases. example, in expect_any_instance_of(widget).to receive(:name).twice isn't clear whether specific instance expected receive name twice, or if 2 receives total expected. (it's former.)

but if using context/describe blocks correctly scope use case problem not exist @ all.

are there negatives using this?

thanks!

although using any_instance appears handy , easy use, cause confusion test suite grows. method invocation expectations used unit style tests should have complete control on dependencies used test subject. if you're using expect_any_instance_of(widget), implies you're not stubbing/mocking dependencies, , instead allowing code outside unit executed part of test, defeats purpose of unit testing. higher coverage tests, i.e., acceptance/integration, shouldn't setting expectations on objects, should confirming system has done requested, either checking output on webpage, or confirming data saved disk.


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