NPE when you forget to call mock inside coVerify/verify

[dalewking]

I have a test where I had a coVerify block and actually forgot to put the call to the method and the error you get is just a NullPointerException. You should detect this and provide a better failure message.

[dalewking]

I think the same would be true for every/coEvery since the NPE is coming from this line of Mockable.record:

            return receiver!! to invocation!!

both values will be null if there are no calls to a mock. The simple solution is to throw a more intelligent exception/assertion in the try block after calling block