Miss Dada  🏳️‍⚧️

@sgrif sure, but ensuring a method was called doesn't guarantee the side effect occurred. Test that the side effect happened.

@tenderlove What if the side effect is charging a credit card?

@sgrif @tenderlove you can build a substitute for this.

@realntl That is just a DIY mock

@sgrif not really, imo. You pass in a substitute to the test subject, which is entirely oblivious as to whether it hits a payment gateway.

@realntl Same with a test double (aka a mock)? You're passing in a fake object to stand in for the real one, and asserting the side effect

@sgrif but what are you testing? I want to pass in a payment processor that declines every card, and assert that I don't complete the order.

@sgrif the contract of the payment processor is irrelevant, which is the only thing a mock can assert on, right? (I could be crazy here)