Unit Testing in Visual Studio 2005 Team System

Unit testing is one of the tasks that every programmer worth their salt needs to do. For example, after writing a class, you often need to write additional code to instantiate the class and test the various methods and properties defined within it. With Visual Studio 2005 Team System, you can now use the new Unit Testing feature to auto-generate the code needed to test your application.

In this article, I will show you how unit testing is performed in Visual Studio 2005 Team System. Note that you need the Microsoft Visual Studio 2005 Beta 2 Team Edition to try the example in this article.

Creating the Application

Launch Visual Studio 2005 and create a new Windows project using the Visual Basic 2005 language. Name the project UnitTesting.

Let's start by first adding a class to the project. Right-click on the project name in Solution Explorer and select Add->New Item…. Select the Class template and name it as Point.vb.

Populate the Point.vb file with the following class definition:

Public Class Point

    Private pX, pY As Integer



    '---default constructor

    Public Sub New()



    End Sub



    '---constructor with two parameters

    Public Sub New(ByVal x As Integer, ByVal y As Integer)

        pX = x

        pY = y

    End Sub



    '---sets the X coordinate

    Property x() As Integer 

        Get

            Return pX

        End Get

        Set(ByVal Value As Integer)

            pX = Value

        End Set

    End Property



    '---sets the Y coordinate

    Property y() As Integer 

        Get

            Return pY

        End Get

        Set(ByVal Value As Integer)

            pY = Value

        End Set

    End Property



    '---calculates the length between 2 points

    Public Function length(ByVal pointOne As Point) As Single

        Return Math.Sqrt(Math.Pow(pX - pointOne.x, 2) + _

               Math.Pow(pY - pointOne.y, 2))

    End Function

End Class

This class represents points on a two-dimension system, with x and y coordinates and a method to calculate the distance between two points.

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