Use FakeItEasy's A.CallTo() on another method in same object

c#, fakeiteasy, unit-testing

Solution

It's possible to do this. If the `WillEat` method were virtual - otherwise FakeItEasy won't be able to fake it out.

With that change, you could do this:

[TestMethod]
public void EatBanana_CallsWillEat()
{
    var fakeMonkey = A.Fake<MyMonkey>();

    fakeMonkey.EatBanana(new Banana());

    A.CallTo(()=>fakeMonkey.WillEat(A<Banana>._)).MustHaveHappened();
}

I'm still not convinced it's a good idea (as I ranted in the comments) - I think you'd be better off relying on other observable behaviour, but I'm not familiar with your system. If you think this is the best way to go, the example code should work for you.

Problem

Using FakeItEasy, how do I check to see if my object's method calls another method on this same object? The Test: ``` [TestMethod] public void EatBanana_CallsWillEat() { var banana = new Banana(); var myMonkey = new Monkey(); myMonkey.EatBanana(banana); //this throws an ArgumentException, because myMonkey is a real instance, not a fake A.CallTo(() => myMonkey.WillEat(banana) .MustHaveHappened(); } ``` The Class: ``` public class MyMonkey { private readonly IMonkeyRepo _monkeyRepo; public MyMonkey(IMonkeyRepo monkeyRepo) { _monkeyRepo = monkeyRepo; } public void EatBanana(Banana banana) { //make sure the monkey will eat the banana if (!this.WillEat(banana)) { return; } //do things here } public bool WillEat(Banana banana) { return !banana.IsRotten; } } ``` I'm open to suggestions. If I'm going about this all wrong, please let me know.

Original source