add basic test script

nodes/1_lib/scripts/test

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+# 
+# this just runs tests/check-eval.nix
+# 
+result="$(
+    echo 'import ./nodes/1_lib/source/tests/check-eval.nix' | nix repl 2>&1 | grep -v 'Inappropriate ioctl for device'
+)"
+expected='Welcome to Nix 2.18.1. Type :? for help.
+
+null'
+
+if [ "$(echo "$result")" = "$expected" ]
+then
+    echo test passed
+fi