ash: fix var_leak.tests so that it actually catches the NOFORK bug

+ document the bug better

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/shell/ash_test/ash-vars/var_leak.tests b/shell/ash_test/ash-vars/var_leak.tests
index 032059295..5242e24eb 100755
--- a/shell/ash_test/ash-vars/var_leak.tests
+++ b/shell/ash_test/ash-vars/var_leak.tests
@@ -1,6 +1,11 @@
-# true is a regular builtin, varibale should not leak out of it
+# cat is an external program, variable should not leak out of it.
 # this currently fails with CONFIG_FEATURE_SH_NOFORK=y
 VAR=''
+VAR=val0 cat /dev/null
+echo "should be empty: '$VAR'"
+
+# true is a regular builtin, variable should not leak out of it.
+VAR=''
 VAR=val1 true
 echo "should be empty: '$VAR'"