Specify the queue to be used with assert_enqueued_jobs

[elfassy]

Summary

Change assert_enqueued_jobs to allow the queue to which jobs are enqueued to be verified. For example:

assert_enqueued_jobs 10, queue: 'low', only: 'Fun' do
  ...
end
assert_enqueued_jobs 1, queue: 'high', only: 'Important' do
  ...
end

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[eileencodes]

I like the idea of adding this, thanks for working on it. I added some comments about suggestions for changes.

[eileencodes]

I think this sentence is confusing and can be worded better. How about something like "Asserts jobs were enqueued the specified number of times. If a queue name is passed, asserts jobs were enqueued for that specific queue."

[elfassy]

How about The number of times a job is enqueued to a specific queue can also be asserted
Comments would then read:

    # Asserts that the number of enqueued jobs matches the given number.
    # ...
    #
    # If a block is passed, that block should cause the specified number of
    # jobs to be enqueued.
    #
    # ...
    #
    # The number of times a specific job is enqueued can be asserted.
    #
    # ...
    #
    # The number of times a job is enqueued to a specific queue can also be asserted.
    #
    # ...

[eileencodes]

Yea that's better. Only thing I'd change is where you say "that block should" - it sounds like "hey it should but who knows ¯_(ツ)_/¯" so I'd change it to "that block will enqueue the specified number of jobs"

[eileencodes]

This is pretty picky on my part, but I don't like the example of the queue name being "low" because it implies in this example that queue name is the priority. While often queue name does have relation to priority there is a priority setting so I'd rather use "default" like you did below.

[eileencodes]

I find this new code to be rather confusing to read. Can you think of a better way to write it? Even if there are more lines I'd like it to be more readable.

[rafaelfranca]

Could you squash your commits?