diff --git a/test/units/testsuite-50.sh b/test/units/testsuite-50.sh
index 9b20b1a29b6..d358b38354e 100755
--- a/test/units/testsuite-50.sh
+++ b/test/units/testsuite-50.sh
@@ -1784,6 +1784,81 @@ test ! -f "${fake_root}${hierarchy}/now-is-mutable" || die "now-is-mutable did n
 drop_env
 
 
+#
+# extension data in /var/lib/extensions.mutable/…, read-only hierarchy,
+# ephemeral import mutability, so extension data contents are imported too
+#
+# mutable merged
+#
+
+
+fake_root=${fake_roots_dir}/ephemeral-import
+hierarchy=/usr
+
+prep_root "${fake_root}" "${hierarchy}"
+gen_os_release "${fake_root}"
+gen_test_ext_image "${fake_root}" "${hierarchy}"
+
+ext_data_path=$(hierarchy_ext_mut_path "${fake_root}" "${hierarchy}")
+prep_ext_mut "${ext_data_path}"
+
+prep_ro_hierarchy "${fake_root}" "${hierarchy}"
+
+touch "${fake_root}${hierarchy}/should-fail-on-read-only-fs" && die "${fake_root}${hierarchy} is not read-only"
+
+# run systemd-sysext
+SYSTEMD_SYSEXT_HIERARCHIES="${hierarchy}" systemd-sysext --root="${fake_root}" --mutable=ephemeral-import merge
+
+touch "${fake_root}${hierarchy}/now-is-mutable" || die "${fake_root}${hierarchy} is not mutable"
+check_usual_suspects_after_merge "${fake_root}" "${hierarchy}" e h u
+test ! -f "${ext_data_path}/now-is-mutable" || die "now-is-mutable should not be stored in extension data"
+
+SYSTEMD_SYSEXT_HIERARCHIES="${hierarchy}" systemd-sysext --root="${fake_root}" unmerge
+
+check_usual_suspects_after_unmerge "${fake_root}" "${hierarchy}" h
+test ! -f "${ext_data_path}/now-is-mutable" || die "now-is-mutable should not appear in writable storage after unmerge"
+test ! -f "${fake_root}${hierarchy}/now-is-mutable" || die "now-is-mutable did not disappear from hierarchy after unmerge"
+
+
+#
+# extension data in /var/lib/extensions.mutable/…, read-only hierarchy,
+# ephemeral mutability through an env var, so extension data contents are
+# imported too
+#
+# mutable merged
+#
+
+
+fake_root=${fake_roots_dir}/ephemeral-import-env-var
+hierarchy=/usr
+
+prep_env "ephemeral-import"
+prep_root "${fake_root}" "${hierarchy}"
+gen_os_release "${fake_root}"
+gen_test_ext_image "${fake_root}" "${hierarchy}"
+
+ext_data_path=$(hierarchy_ext_mut_path "${fake_root}" "${hierarchy}")
+prep_ext_mut "${ext_data_path}"
+
+prep_ro_hierarchy "${fake_root}" "${hierarchy}"
+
+touch "${fake_root}${hierarchy}/should-fail-on-read-only-fs" && die "${fake_root}${hierarchy} is not read-only"
+
+# run systemd-sysext
+SYSTEMD_SYSEXT_HIERARCHIES="${hierarchy}" systemd-sysext --root="${fake_root}" merge
+
+touch "${fake_root}${hierarchy}/now-is-mutable" || die "${fake_root}${hierarchy} is not mutable"
+check_usual_suspects_after_merge "${fake_root}" "${hierarchy}" e h u
+test ! -f "${ext_data_path}/now-is-mutable" || die "now-is-mutable should not be stored in extension data"
+
+SYSTEMD_SYSEXT_HIERARCHIES="${hierarchy}" systemd-sysext --root="${fake_root}" unmerge
+
+check_usual_suspects_after_unmerge "${fake_root}" "${hierarchy}" h
+test ! -f "${ext_data_path}/now-is-mutable" || die "now-is-mutable should not appear in writable storage after unmerge"
+test ! -f "${fake_root}${hierarchy}/now-is-mutable" || die "now-is-mutable did not disappear from hierarchy after unmerge"
+drop_env
+
+
 #
 # done
 #