Visual Basic 2015 Unleashed

Creating Unit Tests

As you can recap from the “Testing Code with Unit Tests” section, unit tests are methods enabling tests against small, isolated portions of code. To be recognized as unit tests, such methods must be decorated with the Microsoft.VisualStudio.TestTools.UnitTesting.TestMethod attribute. Continuing our example and having the requirement of implementing a method for calculating the perimeter for rectangles, this is how the method stub appears:

<TestMethod()>Sub CalculatePerimeter()End Sub

Now go into the method body and write the following line:

Dim rect As New Rectangle

The Rectangle type is not defined yet, so Visual Studio underlines the declaration by throwing an error. Click the light bulb and click Generate new type, as ...