npm and error messages

node_modules/constants-browserify/test.js

@@ -0,0 +1,18 @@
+'use strict';
+
+var Assert = require('assert')
+var Constants = require('./')
+
+try {
+  var nodeConstants = require('constants')
+
+  Assert.deepEqual(nodeConstants, Constants, 'The constants file was not equal')
+}
+
+catch (e) {
+  console.error(e)
+  console.error('\nTests failed!')
+  process.exit(1)
+}
+
+console.info('Tests passed!')