Test not working when building in GNU Guix

[alienman5k]

I am working on adding pass-update to GNU Guix package manager. But tests are failing because tests/commons uses $TMP for the $PASSWORD_STORE_DIR which is not accessible in Guix.

While checking other similar plugin (pass-otp) I notice they use $SHARNESS_TRASH_DIRECTORY as the PASSWORD_STORE_DIR for the tests. I tested doing the same here and that makes tests to run and work properly both standalone and using Guix package manager.

Is it possible to make this fix here upstream?