Question

I am testing the interaction between one object, and another object with some methods that have call-by-name arguments. However, I can’t figure out how to create an argument matcher for that call-by-name argument.

Let’s say that this is the signature of the mocked object:


def fn(arg1: => String, arg2: Int): Any


Then what I really want to do is test if that method is called with a known second argument. I don’t even care all that much about the first argument, but having a way to properly test that as well would be a bonus.

This doesn’t work:


there was one(mock) fn(any[()=>String], eq(12))


nor this:


there was one(mock) fn(any[Function0[String]], eq(12))


and this doesn’t even compile:


there was one(mock) fn(any[=>String], eq(12))

… which obviously is to be expected.

Answer 1

I’ve just added some support in specs2 for byname arguments and functions/partial function arguments. Please try out the latest specs2-1.9-SNAPSHOT and create an issue on GitHub if that doesn’t work for you.