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update release instructions - #171
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estebanmino
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Oct 29, 2019
kanthesha
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Naz-Ovh
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Sep 13, 2026
`withinSandbox` is designed for tests that need to act on the filesystem. It creates a temporary directory and passes it to the function so that it can do whatever it needs to do within the directory in a safer fashion. The name of the sandbox directory is generated from the current time to ensure that each one is unique. However, this causes problems when Jest is running more than one test file, each of which make use of the sandbox. Jest runs test files in parallel, so paired with the naming — and the fact that time can be frozen in tests — it is possible for two tests to create and use the same sandbox simultaneously. `withinSandbox` double-checks that the directory it would have created does not already exist, so when the first test creates the directory it will cause the second test to fail. Also, since `withinSandbox` removes the sandbox directory after it runs its function, this will also cause the second test to fail if it's still running and using that directory. To fix this, this commit changes `withinSandbox` to use a UUID to name the sandbox directory instead of the current time.
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