How do yield fixtures and safe teardown work in pytest?

Explains reverse-order fixture cleanup and designs teardown that remains safe when setup or tests fail.

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A yield fixture performs setup before yield, gives the yielded value to the test, and runs the code after yield during teardown. Pytest unwinds successfully created fixtures in reverse dependency order, even when the test fails. I keep each fixture responsible for one resource so its cleanup is clear. Teardown should target only resources that fixture actually created.

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Explains reverse-order fixture cleanup and designs teardown that remains safe when setup or tests fail.

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Explains reverse-order fixture cleanup and designs teardown that remains safe when setup or tests fail.
A yield fixture performs setup before yield, gives the yielded value to the test, and runs the code after yield during teardown. Pytest unwinds successfully created fixtures in reverse dependency order, even when the test fails. I keep each fixture responsible for one resource so its cleanup is clear. Teardown should target only resources that fixture actually created.
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If a yield fixture fails before reaching yield, its own post-yield code cannot run, but fixtures that completed earlier are still torn down. That is why I avoid one fixture that creates several resources and cleans them only at the end; a middle failure can leak the earlier ones. I split risky operations into fixtures or register a finalizer immediately after a resource is successfully created. Cleanup should also tolerate a partially missing resource.

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Putting several fallible creations before one yield
Deleting broad shared state during cleanup
Masking the test failure with a teardown exception

How do yield fixtures and safe teardown work in pytest?

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