Add meta-data arg to JSON event

[seanpoulter]

Summary
When running Jest in watch mode, the test results that follow the "No tests found related to files changed since last commit" message will be empty. This PR adds detection for this message, and emits this info with the JSON test results. This behavior is required for jest-community/vscode-jest#213.

Test plan
Tests have been added, and I've confirmed the expected behavior debugging vscode-jest.

/cc @orta

[codecov-io]

Codecov Report

Merging #5208 into master will increase coverage by 0.1%.
The diff coverage is 52.38%.

@@           Coverage Diff            @@
##           master   #5208     +/-   ##
========================================
+ Coverage    60.8%   60.9%   +0.1%     
========================================
  Files         201     201             
  Lines        6707    6725     +18     
  Branches        3       4      +1     
========================================
+ Hits         4078    4096     +18     
  Misses       2628    2628             
  Partials        1       1

Impacted Files	Coverage Δ
packages/jest-editor-support/src/Runner.js	63.38% <52.38%> (+12.43%)	⬆️

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[orta]

Yep, this looks good to me - thanks @seanpoulter

[cpojer]

I think it would be great to have some integration tests for this stuff. Right now, when we change text in watch mode, we’d just break this unless people remember to search for usage of these strings.

[seanpoulter]

Good call @cpojer. Are there any similar integration tests running Jest I can look at for inspiration?

[cpojer]

Unfortunately we don't have anything for this yet.

[orta]

Could the test pull out the CLI source code and verify that the flags are still there?

E.g. run check with --watch and validate that it gets the watchMode set? - https://github.com/facebook/jest/blob/master/packages/jest-cli/src/cli/args.js x

[seanpoulter]

Sorry for not keeping this one alive. 😞 I'll build on your idea @orta and figure out if we can print the expected strings without the fancy colors.

Edit: Actually, a full integration test spawning Jest is quicker than I expected and is being pretty informative. I'll build it out for the "Watch Usage" prompt and send another PR.

[github-actions]

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