src_test still falls back to WORKDIR, if S does not point to an existing directory. For other phase functions this is no longer the case since EAPI 4.
Does anyone rely on that behaviour (e.g., define src_test in a virtual)? If not, I would clarify the wording in PMS, which arguably contradicts itself at the moment, and also file a bug for Portage. See https://bugs.gentoo.org/652050 for details.
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