How to fail() a test?

I hate myself when I want to end a test and the only solution coming to my mind is:

```
foo(err) {
if (err) {
test.ok(false, 'error in foo, test finished');
test.done();
}
}
```

Would be useful some kind of `test.fail(error)` method? do I miss something?

Start by reading nodeunit's existing test.ok and test.done APIs, which the issue uses as the current workaround. Determine how a test.fail(error) entry point should report the error and finish the test; done should be covered by tests for the proposed failure behavior.

Written by the indexing model from the issue text.