Running Unit Tests

When you create unit tests, Visual Studio automatically shows and anchors the Test Tools toolbar that contains buttons for executing, debugging, and managing unit tests. You can choose to run a single unit test or multiple ones. For the current example, click the Run All Tests in Solution button. When all unit tests complete, the Test Results tool window shows a report about test success or failures. Figure 59.2 shows how such a window looks for the current example.

Figure 59.2 Viewing unit test results.

Notice how the CalculateAreaTest method failed while CalculatePerimeterTest succeeded. The Error Message column provides details on the occurred error so that you can fix it. In this case the equality check failed because the method returned a result different from the expected one. You can also get detailed failure information, by clicking the Test Run Failed hyperlink. Figure 59.3 shows the failure summary, where you can get information on the test name, server, and timestamp.

Figure 59.3 Viewing the test failure summary.

In the CalculateAreaTest method, replace the expected declaration as follows:

Dim expected As Double = 200

Now run again both unit tests. At this point both tests pass because in both cases expected value and actual value are equal, as demonstrated in Figure 59.4.

Figure 59.4 Both unit tests passed.