IMP(shellcheck): quote variable in tests (SC2086)

tests/hardening/6.2.15_find_passwd_group_inconsistencies.sh

@@ -11,11 +11,11 @@ test_audit() {
     local dir="/etc/passwd"
 
     describe Tests purposely failing 
-    echo "$test_user:x:1100:1100::/home/$test_user:" >> $dir
+    echo "$test_user:x:1100:1100::/home/$test_user:" >> "$dir"
     register_test retvalshouldbe 1
     register_test contain "is referenced by /etc/passwd but does not exist in /etc/group"
     run noncompliant /opt/debian-cis/bin/hardening/"${script}".sh --audit-all
 
     # cleanup
-    userdel $test_user
+    userdel "$test_user"
 }