More Expectation Annotations
Explore how to enhance your automated tests in Rails by using advanced RSpec annotations for test doubles. Learn to stub methods with multiple return values, yield to blocks, call original methods, and fine-tune mocks using argument matching to create isolated and effective tests.
RSpec allows several different annotations to the expectation part of declaring a test double. We can specify more complex return values or a variety of arguments to the stubbed method.
Stubbing return values
A couple of advanced usages of returns may be valuable now and again. If we have multiple return values specified, the stubbed method returns one at a time (spec added on line 21):
Bud1 � l sdsclbool m o d e l sdsclbool @ � @ � @ � @ E � DSDB ` � @ � @ � @
The return values of the stubbed method walk through the values passed to and_return. Note that the values don’t cycle. The last value is repeated over and over again.
Stubbed method
RSpec can do a couple of other useful things with return values. If the method being stubbed takes a block and we want to cause the stubbed method to yield a particular set of arguments to the block, we can do so with and_yield:
`allow(project).to receive(:method).and_yield("arg")`
The expectation is that some method takes a block argument, and we want to pass through ...