Predefined functions enhancements

[gmazzap]

Add stubs for wp_validate_boolean() and wp_slash().

See #125

[jrfnl]

Verified against the WP functions: ✅
Docs: ❌ - I'd expect these need to be added to the "Generic functions" list in the wordpress-tools.md file.
Tests: ❌ - I don't see any (availability) tests for this functionality.

[paulshryock]

I created a PR #134 into this branch which adds some test assertions for wp_validate_boolean. Based on how the existing tests are setup and named, this seemed like the right approach. Wasn't sure if this would bring this PR one step closer towards being ready to merge.

If this is the right approach, and that PR gets merged, then I could similarly add some test assertions for wp_slash and the missing documentation. But I wanted to get some feedback on the approach I took before spending more time on that.

@gmazzap or @jrfnl, if you get a chance to take a look at #134, please let me know if that can be merged, or if you'd recommend any different approach for adding these tests.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.35 ⚠️

Comparison is base (d9ff201) 92.25% compared to head (7f037a5) 91.90%.

❗ Current head 7f037a5 differs from pull request most recent head 202d84c. Consider uploading reports for the commit 202d84c to get more accurate results

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #130      +/-   ##
============================================
- Coverage     92.25%   91.90%   -0.35%     
  Complexity      312      312              
============================================
  Files            28       28              
  Lines           710      828     +118     
============================================
+ Hits            655      761     +106     
- Misses           55       67      +12     

see 20 files with indirect coverage changes

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[gmazzap]

Thanks @jrfnl for the review and sanity check, as usual.

Thanks @paulshryock for the PR, approved your PR and merged it.

I added docs and test for wp_slash (@paulshryock did tests for wp_validate_boolean). I think this is good to merge now.