fix: check equality in toHaveDisplayValue (fix #290)

[nickmccurdy]

What: Uses an equality check on strings passed to toHaveDisplayValue

Why: #290

How: Use this.equals (equality check) instead of matches (which uses includes for substrings)

Checklist:

• Documentation N/A
• Tests
• Updated Type Definitions N/A
• Ready to be merged
  

[codecov]

Codecov Report

Merging #319 (1829dde) into master (2927c95) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #319   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines          533       534    +1     
  Branches       194       197    +3     
=========================================
+ Hits           533       534    +1     

Impacted Files	Coverage Δ
src/to-have-display-value.js	100.00% <100.00%> (ø)

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[gnapse]

@nickmccurdy technically this is a breaking change, although whoever was relying on this can be considered as having been relying on a bug, so I'm not sure.

[nickmccurdy]

It seems like the existing behavior is inaccurate according to the documentation (see #290 (comment)). As users are supposed to follow the documented API, I would consider this to be a semver minor/patch bug fix, not a major release.

[github-actions]

🎉 This PR is included in version 5.11.7 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[nickmccurdy]

@all-contributors add @nickmccurdy for docs, code

[allcontributors]

@nickmccurdy

I've put up a pull request to add @nickmccurdy! 🎉