I wanted to run regular MSTest unit test written in C# to assert JavaScript code. There are several ways to accomplish this, but in this case I use JSTest.
Just add JSTest to your C# testproject with NuGet, now you can write tests like:
Test class
using JSTest;
using JSTest.ScriptLibraries;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using TestProject1.Helpers;
namespace TestProject1
{
[TestClass]
public class UnitTest1
{
[TestMethod]
public void TestMethod1()
{
var script = new TestScript();
// Arrange: Append the JavaScript code to test.
string scriptContents = (new AssemblyHelper().GetContentsEmbededResourceFile("TestProject1.MvcApplication1.Scripts.Person.js"));
script.AppendBlock(scriptContents);
// Arrange: Append the JSTest asser library, so we can assert the test code.
script.AppendBlock(new JsAssertLibrary());
// Append "Act" JavaScript code.
script.AppendBlock("var person1 = new Person('John Do', 32, 'Software Engineer');");
// Assert.
script.RunTest(@"assert.equal('Jonh Do test', person1.sayName());");
}
}
}
Running this test within Microsoft Visual Studio 2010 will result in a passed test.
JavaScript code to test
function Person(name, age, job)
{
var privateField1 = 'test';
this.name = name;
this.age = age;
this.job = job;
this.privilegedMethod = function () { return privateField1; }
};
Person.prototype.sayName = function ()
{
return this.name + ' ' + this.privilegedMethod();
};
Notes
– The privilegedMethod is used to access private fields on the Person class.
– You can set breakpoints in the JavaScript code!!
C# helper class
using System;
using System.IO;
using System.Reflection;
namespace TestProject1.Helpers
{
public class AssemblyHelper
{
/// <summary>
/// Read the contents of an embededresourcefile with the given name.
/// </summary>
/// <param name="resourceName">Name of the resource.</param>
/// <returns></returns>
public string GetContentsEmbededResourceFile(string resourceName)
{
if (string.IsNullOrWhiteSpace(resourceName)) { throw new ArgumentNullException("resourceName"); }
string contents = string.Empty;
using (Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(resourceName))
using (var reader = new StreamReader(stream))
{
contents = reader.ReadToEnd();
}
return contents;
}
}
}
Microsoft Visual Studio 2010
