Defines a callback that can be consumed and asserted on.

Note: module will be defined under the calling process.

This function will raise when the specified callback is not a public function on module.

Options

:count - How many times the callback can be consumed.

• :infinity - The callback can be consumed an infinite number of times. For a module, function, and arity, only a single infinity-callback will be defined at once, last write wins. Infinity-callbacks are always consumed after non-infinity-callbacks.
• 0 - The callback should never be consumed. Raises an error if it is. The callback is removed upon raising.