As you can recap from the “Testing Code with Unit Testing” section, unit tests are methods allowing 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:
Now go into the method body and write the following line:
Dim rect As New Rectangle
Rectangle type is not defined yet, so Visual Studio underlines the declaration by throwing an error. ...