Separated the snapshot summary creation from the printing to improve testability.

[excitement-engineer]

I noticed that the coverage for the jest-cli reporters was not very high so I decided I could add some value by writing some tests for it:)

I split the creation of the snapshot summary to a separate file (get_snapshot_summary.js).

I wanted to write a test for the snapshot summary text printed in the console at the end of a text. However, the summary_reporter.js in which the snapshot summary creation is contained requires a lot of overhead to set up making focused testing difficult. This is why I split the creation of the snapshot summary from the reporting about it.

I am hoping that test coverage of the reporters can be gradually improved by splitting them up into smaller units with well defined and focused responsibilities that are easily testable.

Let me know what you think!

[codecov-io]

Codecov Report

Merging #4373 into master will increase coverage by 0.19%.
The diff coverage is 91.3%.

@@            Coverage Diff             @@
##           master    #4373      +/-   ##
==========================================
+ Coverage   55.85%   56.04%   +0.19%     
==========================================
  Files         189      190       +1     
  Lines        6383     6388       +5     
  Branches        6        6              
==========================================
+ Hits         3565     3580      +15     
+ Misses       2815     2805      -10     
  Partials        3        3

Impacted Files	Coverage Δ
...ackages/jest-cli/src/reporters/summary_reporter.js	12% <0%> (-7.7%)	⬇️
...ges/jest-cli/src/reporters/get_snapshot_summary.js	100% <100%> (ø)
packages/jest-cli/src/reporters/utils.js	63.54% <0%> (+1.04%)	⬆️

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[cpojer]

Woohoo, more code coverage :) Thanks again @excitement-engineer. Looks good, nice diff.

[github-actions]

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