We have the homebrew-x11 tap for this reason so let's migrate everything
without any reverse dependencies. Ideally I'd also like to migrate
everything that's :recommended and the GTK formulae through there too
(or to a dedicated homebrew-gtk).

Closes Homebrew/homebrew#33056.

Closes Homebrew/homebrew#35266.

test_defined? gets defined in the method_added hook.

Also, tweak the XQuartz requirement to not show 0.0.0 versions being required.

Closes Homebrew/homebrew#35254.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Fixes Homebrew/homebrew#35143.
Closes Homebrew/homebrew#35239.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Test everything that `brew uses` a formula, has a bottle and a test.

This should allow some quick gains in terms of spotting formulae that may need
revisioned to avoid problems with shifting dependencies. As the test-bot lives
in a data centre with (very) fast internet the fetch and extraction time
shouldn't slow things down much.

Closes Homebrew/homebrew#35092.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Dependency names are prefixed with the tap location, therefore
dependency names do not match formula names. We convert dependencies
into formulas to ensure proper name checking.

Closes Homebrew/homebrew#35058.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

`opam list <package>` only checks if the package is available

Closes Homebrew/homebrew#35209.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

http://www.rubydoc.info/gems/yard/file/docs/Tags.md#private
http://www.rubydoc.info/gems/yard/file/docs/Tags.md#api