FileSize directive - refactor test

PLZ Tidy Code

HTML

<script src="http://code.angularjs.org/angular-1.0.1.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.min.js"></script>
 File size in B:
<!-- Expected output: -->
<!-- 337 B  -->
<span file-size="337"></span> File size in kB:
<!-- Expected output: -->
<!-- 13.1 kB  -->
<span file-size="13371"></span> File size in MB:
<!-- Expected output: -->
<!-- 12.8 MB  -->
<span file-size="13371337"></span>

CSS

span {
    display: block;
    margin-bottom: 20px;
}

JavaScript

var myApp = angular.module('myApp', []);

// Directive name: 'fileSize'
// Last changed: 201512
myApp.directive("fileSize", function() {
    return {
        restrict: "A",
        template: '<span>{{result}}</span>',
        replace: true,
        scope: {
            fileSize: '=',
        },
        controller: function ($scope) {
        		var bytes = $scope.fileSize;
        		var returnVal;
            if(bytes < 1024) {
              returnVal = bytes + " B";
            } else if(bytes < 1024*1024) {
              returnVal = (bytes / 1024).toFixed(1) + " kB";
            } else {
              returnVal = (bytes / (1024*1024)).toFixed(1) + " MB";
            }
            $scope.result = returnVal;
        }
    };
});