Refactor tmp dir detection to improve testability #10381
Merged
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Testing to prevent: #10407
In its current state, testing the temp directory detection logic is quite difficult to do due to the size of the function the logic is nested within. Due to the difficulty of the testing, tests have not been implemented and resulted in a bug (#10372) being merged that should easily be caught with tests. This PR refactors the temp directory setting logic into its own function, allowing unit tests to easily be written for it. Unit tests are included in this PR that will prevent the bug from being merged again.