Function rejectionOf

Test function. Checks that an async function throws an error on execution. It returns the thrown error. Allows easier inspection of the thrown error.

Example

 const error = await rejectionOf<MosaicError>(handler.onMessage(body, message));

 expect(error.message).toBe('Some error message');
 expect(error.code).toBe('SOME_CODE');
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For synchronous functions use expectFailure