Update tests for ignored modules

sample/excluded/index.js

@@ -1,4 +1,6 @@
-const chai = require('chai');
+if(false) { // never called
+    require('chai');
+}
 
 module.exports = function (context, req) {
     context.log('"simple" function called');

sample/package.json

@@ -12,5 +12,8 @@
     "azure": "^1.2.0-preview",
     "lodash": "^4.17.4",
     "tedious": "^1.14.0"
+  },
+  "devDependencies": {
+    "chai":"3.5.0"
   }
 }