Added basic tests

Author: dev-tim

chapter1/index.js

@@ -8,14 +8,11 @@
      }
   }
 
-
-  let composedBlablaFunction = function(blaFunction){
+  let composedBlablaFunction = function(blaFunction) {
     console.log('Get some air in your lungs!');
     blaFunction();    
     console.log('Now you can rest!')
   }
 
   composedBlablaFunction(blablaFunction('Hello world')) 
-
-
 }());

chapter1/package-lock.json

@@ -7,5 +7,8 @@
     "test": "mocha here"
   },
   "author": "",
-  "license": "MIT"
+  "license": "MIT",
+  "devDependencies": {
+    "mocha": "^5.2.0"
+  }
 }

chapter1/package.json

@@ -0,0 +1,8 @@
+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);
+    });
+  });
+});