Documentation function "whenCalling()" origin is missing

[PedroHBrasil]

The documentation refers to a function named whenCalling() to define the behavior of testing of throwing exceptions. However, it doesn't say where this function come from and it doesn't look like the package includes this function.

I believe this function should either be provided with the package or an explicit mention to the package that defines it should be included in the documentation.

[PedroHBrasil]

Nevermind. Another person had the same issue but the name wasn't as clear: issue #104