1. Create a new empty ASP.NET Web Application in Visual Studio, as shown here:

2. Download and add Qunit.js from https://qunitjs.com/.
3. Under the scripts folder, add the common.js library created in the first recipe of this chapter:

var packtNs = packtNs || {}; 
packtNs.common = packtNs.common || {}; 

packtNs.common.populateWithTodaysDate =  function() 
{ 
  if (Xrm.Page.getAttribute("packt_supervisor").getValue() 
     !== null && Xrm.Page.getAttribute("packt_postgraduatestartdate").
     getValue() === null) 
  { 
    Xrm.Page.getAttribute("packt_postgraduatestartdate").
     setValue(new Date()); 
  } 
} 

4. Add the following code in the Xrm.Fake.js file:

var Xrm = {}; 
Xrm.Page = {} 
var Attribute = function (attributeName) { 
  this.attributeName = attributeName,
   this.setValueCounter = 0; 
  this.getValue = function () { 
    if (this.attributeName === ("packt_supervisor")) { 
      return "Sample Value"; 
    } 
    return null; 
  }, 
  this.setValue = function (value) { 
    this.setValueCounter += 1; 
  }, 
  this.getCountFunctionCalls = function () { 
    return this.setValueCounter; 
  } 
} 
var pageAttributes = {} 
Xrm.Page.getAttribute = function (attributeName) { 
  if (pageAttributes[attributeName]) { 
    return pageAttributes[attributeName]; 
  } 
  pageAttributes[attributeName] = new 
     Attribute(attributeName); 
  return pageAttributes[attributeName]; 
} 

5. Add the following code in the common.test.js file:

/// <reference path="common.js"/> 
/// <reference path="qunit-2.0.1.js" /> 
/// <reference path="FakeXrmPage.js"/> 
test("Xrm test populateWithTodaysDate", function () { 
  // Act 
  packtNs.common.populateWithTodaysDate(); 

  //Assert  equal(Xrm.Page.getAttribute("packt_postgraduatestartdate")
   . getCountSetValueCalls(), 1, "PostGraduate attribute 
   setValue called exactly once"); 
}); 

6. Run the test by clicking on the ReSharper icon next to your test method and select Run: