Add prefer-to-have-length rule to eslint-plugin-jest package

[xfumihiro]

No description provided.

[SimenB]

I like it, but I'm guessing @cpojer would prefer to not have it bundled.

If he does not want it, I suggest we create an eslint-plugin-jest-extras or something and stick it in https://github.com/jest-community/

(there are more rules I'd like that are more nice-to-haves than anything else)

[cpojer]

I like it also, actually. This makes sense to me for better failure messages.

[codecov-io]

Codecov Report

Merging #4771 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #4771      +/-   ##
=========================================
+ Coverage   58.94%     59%   +0.06%     
=========================================
  Files         199     200       +1     
  Lines        6630    6626       -4     
  Branches        3       4       +1     
=========================================
+ Hits         3908    3910       +2     
+ Misses       2722    2716       -6

Impacted Files	Coverage Δ
packages/eslint-plugin-jest/src/index.js	100% <ø> (ø)	⬆️
...int-plugin-jest/src/rules/prefer_to_have_length.js	100% <100%> (ø)
packages/jest-environment-jsdom/src/index.js	38.88% <0%> (-1.54%)	⬇️
packages/jest-config/src/normalize.js	92.68% <0%> (ø)	⬆️

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[SimenB]

@xfumihiro Can you make this, and the others you sent (woo! thanks!), fixable? Should be straightforward 🙂

[xfumihiro]

@SimenB Done

[github-actions]

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