// WithError injects an error into the mock outbox.
WithError injects an error into the mock outbox.
// WithError injects an error into the mock outbox .
func (m *Outbox) WithError(err error) *Outbox {
	m.err = err
	return m
}
func ( m * Outbox ) WithError ( err error ) * Outbox { m . err = err return m }
WithError injects an error into the mock outbox.
WithError injects an error into the mock outbox .