rspec

@mock.stub!(:something)
@mock.should_receive(:something).with("a","b","c")
lambda {
  @mock.something("a","d","c")
  violated
}.should raise_error(MockExpectationError, "Mock 'test mock' expected :something with (\"a\", \"b\", \"c\") but received it with (\"a\", \"d\", \"c\")")

fails with:

expected Spec::Mocks::MockExpectationError with "Mock 'test mock' expected :something with (\"a\", \"b\", \"c\") but received it with (\"a\", \"d\", \"c\")", got Spec::Expectations::ExpectationNotMetError

Other similar cases fail with something like this:

Mock 'test mock' expected :something with (\"a\", \"b\", \"c\") but it was never received.

If there is no stub of :something, the message is more helpful, like this:

Mock 'test mock' expected :something with (\"a\", \"b\", \"c\") but received it with (\"a\", \"d\", \"c\")

We should get that to work even when there is a stub.