Testing JavaScript classes with .Net - bet practices?

Question

Riddle me this:

Given I have a class 'calculator.js' written in JavaScript

I would like to unit-test each method in this class - prefereably using C# - prefereably using dynamic invocation of the methods in the class

so, ideally:

[TEstMethod]
public void Divide_WhenDividendIsZero_ResultIsZero()
{
    // Arrange
    dynamic myJsClass = someFactory.CreateInstanceOf(myJsFilePath);

    // Act
    var result = (int) myJsClass.Divide(9, 0);

    // Assert
    result.ShouldEqual(0, "Division by zero should result in zero");
}

According to the hype, .Net 4.0 introduces the possibility to do this, however, I have not found any good tutorials on what I need to rig this up.

For the majority of my tests, WebDriver will do, however, for the "pure" javascript classes, this is my preferred way to do it - if it is possible at all?

Michael Sondergaard · Accepted Answer · 2011-10-25 10:57:58Z

2

You could load up IronJS (https://github.com/fholm/IronJS) and test the javascript using that.

It's not really .NET 4.0, but the DLR (Dynamic language runtime) that "makes this possible". IronJS will run on .NET 3.5 and there's experimental support for 2.0 and 3.0.

For specific documentation on how to run js with the library, this page will help: https://github.com/fholm/IronJS/wiki/Creating-a-hosting-context

answered Oct 25, 2011 at 10:57

Michael Sondergaard

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