fix: source functions

sourcing /lib/functions so uci_get is in scope

test/functions.sh

@@ -0,0 +1,9 @@
+# create a symlink to this file at /lib/functions.sh for testing
+
+# mock implementation of uci_get that always returns the default value
+uci_get() {
+  for item in "$@"; do
+    last=$item
+  done
+  echo "$last"
+}