Global strict mode for rules and Node tests

test/node/.eslintrc

@@ -2,5 +2,8 @@
   "env": {
     "es6": true,
     "mocha": true
+  },
+  "rules": {
+    "strict": [2, "global"]
   }
 }

test/node/one-provide.js

@@ -1,3 +1,5 @@
+'use strict';
+
 const assert = require('assert');
 const fs = require('fs');
 const glob = require('glob');