An instance of the RhumRunner.

Make an assertion that actual and expected are equal, deeply. If not deeply equal, then throw.

Executes a function which returns a promise, expecting it to throw or reject. If it does not, then it throws. An error class and a string that should be included in the error message can also be asserted. Or you can pass a callback which will be passed the error, usually to apply some custom assertions on it.

Creates a Promise with the reject and resolve functions placed as methods on the promise object itself. It allows you to do: