It supports have_enqueud_mail matcher sub class of DeliveryJob.

[yalab]

Hi.

I Fixed a bug.

Thanks.

[JonRowe]

Nice catch, and an interesting use of the <= operator, is that documented anywhere? I've a few suggestions to the naming / grammar used but the approach is sound 👍

[pirj]

Nice catch!
Please add a changelog entry.

[yalab]

an interesting use of the <= operator, is that documented anywhere?

See ri 'Class#<=' on your terminal.

= Class#<=

(from ruby core)
=== Implementation from Module
------------------------------------------------------------------------
  mod <= other   ->  true, false, or nil

------------------------------------------------------------------------

Returns true if mod is a subclass of other or is the
same as other. Returns nil if there's no relationship between
the two. (Think of the relationship in terms of the class definition:
"class A < B" implies "A < B".)