It seems like sslroot: needs to be defined for some tests to work.
Submitted by Steven M. Schweda <sms@antinode.info>

test/tests.com

diff --git a/test/tests.com b/test/tests.com
index 702d087..7fd9993 100644
--- a/test/tests.com
+++ b/test/tests.com
@@ -12,6 +12,9 @@
 $	texe_dir := sys$disk:[-.'__arch'.exe.test]
 $	exe_dir := sys$disk:[-.'__arch'.exe.apps]
 $
+$	sslroot = f$parse("sys$disk:[-.apps];",,,,"syntax_only") - "].;"+ ".]"
+$	define /translation_attributes = concealed sslroot 'sslroot'
+$
 $	set default '__here'
 $	on control_y then goto exit
 $	on error then goto exit
@@ -287,4 +290,5 @@
 $
 $ exit:
 $	set default '__save_default'
+$	deassign sslroot
 $	exit