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I'm working in a react codebase where we have test files labeled
__tests__
The files inside look like this
filename.js
Previously when I've used jest/enzyme, I've had test files formatted like this
filename.test.js
I am assuming that when you put a file inside a folder with the title
__tests__
you can leave the .test part off? I can't seem to find a solid answer on topic. Does anyone have some insight into the formatting functionality?
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transformIgnorePatterns [array<string>] Default: ["/node_modules/"] An array of regexp pattern strings that are matched against all source file paths before transformation. If the test path matches any of the patterns, it will not be transformed.
Order of Execution Once the describe blocks are complete, by default Jest runs all the tests serially in the order they were encountered in the collection phase, waiting for each to finish and be tidied up before moving on.
Each time a test run completes, the global environment is automatically reset for the next. Since tests are standalone and their execution order doesn't matter, Jest runs tests in parallel.
To match part of an Array in Jest, we can use expect. objectContaining(partialObject) .
This is because of the value of jest config's testMatch property which defaults to
[ "**/__tests__/**/*.[jt]s?(x)", "**/?(*.)+(spec|test).[jt]s?(x)" ]
Which basically means that it will consider as a test any js(x) or ts(x) file either with .test (or .spec) after it or inside a __test__ folder.
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