expect.hasAssertions()

[mxstbr]

Summary

I want to verify that at least one assertion was called in a test, rather than a specific number of assertions.

Reference and closes #3359

Test plan

I can't figure out how to unit test for it throwing an error if there aren't any assertions, I just get a failing test 😅 would appreciate some pointers, as soon as that's tested I'll document it.

[cpojer]

Awesome! Great to see you contributing to Jest :)

• I'm a bit unsure why the yarn lockfile changed in jest-runtime, that's odd.
• Check out the existing expect.assertions tests in integration_tests. Short story: we have tests that invoke a Jest test run and then ensure the right thing happens. Jestception.

[codecov-io]

Codecov Report

Merging #3371 into master will decrease coverage by 0.04%.
The diff coverage is 22.22%.

@@            Coverage Diff             @@
##           master    #3371      +/-   ##
==========================================
- Coverage   64.89%   64.84%   -0.05%     
==========================================
  Files         176      176              
  Lines        6521     6529       +8     
  Branches        4        4              
==========================================
+ Hits         4232     4234       +2     
- Misses       2288     2294       +6     
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-jasmine2/src/setup-jest-globals.js	0% <0%> (ø)	⬆️
packages/jest-matchers/src/index.js	95.34% <100%> (+0.11%)	⬆️

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[anilreddykatta]

@mxstbr @cpojer I tried to update this pull request with integration-test, docs, removal of yarn.lock from previous pull request. I wasn't able to. I raised one more pull request with suggested changes, from the forked jest repo. Let me know of any further changes?

[thymikee]

@mxstbr I'll close this in favour of #3379

[github-actions]

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