Uses ${ED} in src_test. We can probably just drop that parameter into emake.
Yeah, probably a copy-paste error.
commit 57efa0596a2c2522d1f312a92cc2df6cba2f1d7c Author: Michał Górny <mgorny@gentoo.org> Date: Wed Jun 16 19:38:22 2021 +0200 kernel-build.eclass: Do not pass INSTALL_PATH in src_test Signed-off-by: Michał Górny <mgorny@gentoo.org>