add assert_called_exactly

[rauann]

I've added the assert_called_exactly assertation which is related to what was proposed here #116 inspired by RSpec Mocks.

[coveralls]

Coverage remained the same at 100.0% when pulling 3a5d26f on rauann:rauann/add-assert-called-exactly into b97006d on jjh42:master.

[Olshansk]

Thanks for the the contribution and the clear and detailed documentation!

[benmmari]

Hi @rauann, @Olshansk

I can see this PR has been merged into master, and that the readme reflects the changes. However - unless I am missing something - it doesn't look like this new functionality has been released yet?

[Olshansk]

Sorry about the delay, just published a new release: https://hex.pm/packages/mock/0.3.6

[benmmari]

Thank you 🏆