Add spec for RSpec/AlignLeftLetBrace and RSpec/AlignRightLetBracewith Layout/ExtraSpacing

[ydah]

This PR is add spec for RSpec/AlignLeftLetBrace and RSpec/AlignRightLetBrace with Layout/ExtraSpacing

I found this while looking at the coverage of the test code generated by simplecov.

Before

After

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Before submitting the PR make sure the following are checked:

• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• [-] Updated documentation.
• [-] Added an entry to the CHANGELOG.md if the new code introduces user-observable changes.
• The build (bundle exec rake) passes (be sure to run this locally, since it may produce updated documentation that you will need to commit).

[pirj]

Fantastic!

Wondering, would it be possible to write a spec that would cover AlignRightLetBrace.autocorrect_incompatible_with? If I remove this method, this spec remains green (as opposed to it becoming red if I remove the RuboCop::Cop::Layout::ExtraSpacing.singleton_class.prepend).

Thank you!

[ydah]

@pirj Perhaps, but I think it is because it is a method chain.
If we write this separately, it would look like this, but I don't think it's a good idea to change our code to check for code coverage, so I'm leaving it as it is.

[pirj]

Thank you, @ydah !