FYI, there are README files in several of the jest test folders. https://searchfox.org/mozilla-central/source/devtools/client/aboutdebugging-new/test/jest/README.md
Bug 1571365 Comment 1 Edit History
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FYI, there are README files in several of the jest test folders. https://searchfox.org/mozilla-central/source/devtools/client/aboutdebugging-new/test/jest/README.md https://searchfox.org/mozilla-central/search?path=&q=jest%2FREADME.md