Add support for finding buttons that use aria-label for a value.

[bkosborne]

See #779

This adds support for finding a button by its aria-label value.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.73%. Comparing base (d8527fd) to head (98f712c).
⚠️ Report is 16 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #865   +/-   ##
=========================================
  Coverage     98.72%   98.73%           
  Complexity      374      374           
=========================================
  Files            24       24           
  Lines          1022     1024    +2     
=========================================
+ Hits           1009     1011    +2     
  Misses           13       13           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

[maelanleborgne]

As it is very hard to extend the library, I would greatly appreciate if this feature was merged 🙂

[aik099]

As it is very hard to extend the library, I would greatly appreciate if this feature was merged 🙂

@maelanleborgne , can you please be more specific?

P.S.
I've approved this PR.

I've confirmed, that the tests actually test the added code by removing added HTML elements from the test fixtures one by one and witnessing, that tests start to fail after that.

// cc: @stof

[uuf6429]

Not bad, but aria-label applies to way more elements than just <button>. In particular, it should probably be implemented on '%linkMatch%' (similar to '%buttonMatch%').

[mlncn]

Thanks for approving— i think it is worth getting in as is, and future improvements (links as well as buttons, aria-labelledby) can build on it.