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Answers questions on Jest: matchers, mock functions, snapshots, async tests, timers and configuration, citing the exact file in the public docs of the GitHub repo jestjs/jest (MIT). Not an official Jest product.
How do I mock a function?
How do I test async code?
How do snapshot tests work?
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Answers questions on the Narrative of the Life of Frederick Douglass: his life in slavery, learning to read and his escape, quoting the 1845 text from Project Gutenberg (public domain) and naming the chapter.
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