Performing Unit Testing in Visual Studio .NET

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prodID = 0 actual = PTBOProductCreate(prodID) AssertIsInstanceOfType(actual, GetType(Product), _ "PTBOProductCreate did not return the expected data type") ' Test Case 4: Pass in an ID of 0, ' assert that the properties of the Product object ' are initialized AssertAreEqual(actualProductID, 0, _ "PTBOProductCreate did not set " & _ "the expected value for ProductID") AssertAreEqual(actualProductName, Nothing, _ "PTBOProductCreate did not set " & _ "the expected value for ProductName") AssertAreEqual(actualInventoryDateHasValue, False, _ "PTBOProductCreate did not set " & _ "the expected value for InventoryDate") End Sub
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The code for the rst test case sets the prodID parameter to 1 and calls the Create method It then uses the IsInstanceOfType method of the Assert class to ensure that an instance of the Product class was returned This could instead call IsNotNull to ensure that the instance was not Nothing The code for the second test case checks the value of each property against its expected value It uses the AreEqual method of the Assert class to ensure that the values are equal The code for the third test case sets the prodID parameter to 0 and calls the Create method It then again veri es that an instance of the Product class was returned The code for the fourth test case checks the value of each property to ensure that it was appropriately initialized The key to building good unit tests is to think through all the possible test cases for the class members For properties, assign both valid and invalid data, and ensure that both are handled as appropriate for your application For methods, pass in both valid and invalid parameters to ensure that your application handles both A good organizational technique for your unit tests is to number each test case and include it as documentation in the unit test method, as shown in the example in this section
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6 CLASS TOOLS AND TECHNIQUES
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Running the Unit Test
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Once you have created your unit tests, you can run them Running tests automatically produces test results, saves the results, and displays a summary of the results To run a test project, set the test project as the startup project for the solution Then start the project just like you would start any other project The testing runtime executes the tests, showing you the progress in the Test Results window When the test is complete, the Test Results window shows you a summary of the test results, as shown in Figure 615
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The Test Results window displays the results of your tests
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The most important feature of this dialog is information on the results of your test Notice that the CreateTest unit test passed The other unit tests either failed or generated an inconclusive result This is because the code generation does not provide you with a test that passes You need to write custom code in each test To pass all the unit tests, you need to update every unit test method, similar to how the CreateTest method was updated You can perform a number of other tasks from this dialog:
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The leftmost drop-down list in the Test Results toolbar allows you to select a test run to view Every test run is automatically saved, and you can view any of the runs The default is the latest test run Buttons in the Test Results toolbar allow you to execute tests directly from this window Buttons in the Test Results toolbar allow you to export or import test results The rightmost controls in the Test Results toolbar allow you to organize the Test Results window contents by grouping, sorting, or ltering the results
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Implementing Master/Detail Classes
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The Show Code Coverage Results button in the Test Results toolbar (accessible from the Toolbar Options icon shown with double arrows at the far right) allows you to view your test s code coverage This de nes how much of your code was actually tested
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NOTE: You must run the unit test project without debugging (Debug | Start Without Debugging) in order to build the code coverage results
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See the Additional Reading section for more information on all of the many features available when executing tests and reviewing results
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