Stubbing terminal user input in RSpec
Reading user input in console applications is usually done using
Kernel#gets. Stubbing that can be a bit hairy.
When your code expects user input, you can not say
Kernel.stub(gets: 'user input'). This will have no effect because of reasons.
Instead, you need to know which class will call
gets. For example:
described_class.any_instance.stub(gets: 'user input')
If you do not know where
gets is called, you can try something like this:
Object.any_instance.stub(gets: 'user input')
Any instance of an object should eventually hit that stub.