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This ensures the buffers used by the empty `bytearray` and `array.array` are aligned the same as a pointer returned by the allocator. This is a more convenient default for interop with other languages that have stricter requirements of type-safe buffers (e.g. Rust's `&[T]` type) even when empty.
Tests in this directory are compiled into the _testcapi extension. The main file for the extension is Modules/_testcapimodule.c, which calls `_PyTestCapi_Init_*` from these functions. General guideline when writing test code for C API. * Use Argument Clinic to minimise the amount of boilerplate code. * Add a newline between the argument spec and the docstring. * If a test description is needed, make sure the added docstring clearly and succinctly describes purpose of the function. * DRY, use the clone feature of Argument Clinic. * Try to avoid adding new interned strings; reuse existing parameter names if possible. Use the `as` feature of Argument Clinic to override the C variable name, if needed.