added mocha and dummy test

Author: giancarloGiuffra

package.json

@@ -16,9 +16,11 @@
     "require": "^2.4.20",
     "yargs": "^11.0.0"
   },
-  "devDependencies": {},
+  "devDependencies": {
+    "mocha": "^5.2.0"
+  },
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "mocha"
   },
   "repository": {
     "type": "git",

test/e-chords.scraper.js

@@ -0,0 +1,11 @@
+var assert = require('assert');
+
+describe('Array', function() {
+
+  describe('#indexOf()', function() {
+    it('should return -1 when the value is not present', function() {
+      assert.equal([1,2,3].indexOf(4), -1);
+    });
+  });
+  
+});