allending/Kiwi — pull request #268 by pbernery (2013-04-26 13:25:19+00:00)
Title: Adds a failWith macro to report a failure.

This is typically used to ensure a code block is never called during
spec validation.
The name of the macros is inspired from the fail_with method of RSpec.

Use case:
```obj-c
[object doSomething:^ (NSArray *array) {
// Success block
[[array should] beEmpty];
} failure:^{
// Failure block.
failWith(@"the method should not fail in this test");
}];
```