Add basic axe core testing for blocks #3570
Merged
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Part of #3535
Adds the
axe-core-rspecgem as a dev dependency. Axe core has good support for heading ordering rules, so this will start to give us some feedback as we make changes.I've included these directly in the block specs, sometimes piggy-backing on an existing test, in an attempt to keep the number of new/mostly duplicated feature tests to a minimum. It looks like Blacklight moved away from the
be_accessiblehelper and is now usingbe_axe_cleandirectly so I've done the same.