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The CalculateRate() method uses the periodic interest rate (annual interest divided over the number of periods in a year) and compound period rate (payments in a month). You may consider the decimal data type for use with money-related calculations. You may even want to use your own Money type. We won t deal with these issues, to make the case simpler. After all, we re chasing the perfect CI process and
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First encounters w ith unit testing
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not financial issues. This small financial library is a perfect fit for the first test case. You ll test it with NUnit.
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NUnit (www.nunit.com) is a legend in the unit testing world of .NET. It s one of the oldest automated testing frameworks for .NET and was originally a clone of the Java test library JUnit. NUnit has the responsibility of running unit tests and providing feedback about which tests pass and which ones fail. You ll see that NUnit is easy to use. The easiest way to install it is to download the zip file and extract the core of the testing framework from NUnit-Version\bin\net-2.0\framework into your tools directory. Next, you have to decide where to put the code you write for the unit test. There are two possible locations for your unit test code: together with the code you re about to test, or in another project. Both approaches have their plusses and minuses. Putting all the code together lets you test the private members, but creates a dependency on the unit testing framework. We prefer using separate library classes for the sake of cleanly separating test and production code. This way, you can easily drop the test DLLs while building the release on the CI server. For this example, you ll go this way. It s a good idea to use a pattern for the test projects names. We like to name them after the project they re testing and then add the suffix .Test. For the example, this yields the name CiDotNet.Calc.Test. Further, the test should correspond with the structure of the production code. The same folder structure and of course one test fixture per class is a good way to go. We encourage you to give this some thought; there s no one best pattern for the unit test infrastructure; something else may work better for you. But keep in mind that your test suite will eventually grow to hundreds or thousands of test cases. Now you need to create the actual unit test. Add a new class library project to your solution, and name it CiDotNet.Calc.Test. Add a reference to the CiDotNet.Calc project and then to the nunit.framework.dll. The Finance.cs class lies in the Math subdirectory of the production project, so create a FinanceTestFixture.cs file in the Math directory of the test project. Add the following code to this new class. Listing 6.2 A simple unit test for the rate calculation
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using NUnit.Framework; using CiDotNet.Calc.Math; namespace CiDotNet.Calc.Test.Math { [TestFixture] public class FinanceTestFixture { [Test] public void CalculateRate() { int Duration = 12; int Ppy = 12; double PeriodicInterestRate = 7.5;
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double presentValue = 30000; double finalValue = 0; CiDotNet.Calc.Math.Finance.Mode mode = CiDotNet.Calc.Math.Finance.Mode.BeginMode; double ExpectedRate = 2586.556528260553; double ActualRate = Finance.CalculateRate(Duration, Ppy, PeriodicInterestRate, presentValue, finalValue, mode); Assert.AreEqual(ExpectedRate, ActualRate); } } }
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NUnit uses reflection to dig the test methods from the test library. It uses attributes to find what it needs. First, you need to decorate the test class with the [TestFixture] attribute, which tells NUnit that it s found a class containing tests. All the test methods must be public voids and have the [Test] attribute. In the test code, you can do everything that s possible in .NET. In the CalculateRate() method, you name the calculation parameters in local variables and fill them with values. You then define the ExpectedRate variable and assign it the value that you expect to be returned from the calculation. The ActualRate variable will be set with the actual calculation value from the Finance library. A test needs something that tells it whether it was a success or a failure. This is called an assertion. The Assert.AreEqual method is part of the NUnit framework. It compares the ExpectedRate to the ActualRate. If they re equal, the test passes. If not, the test fails. You can execute the test a few ways. One of them is to use the GUI test runner that comes with NUnit, nunit-x86.exe. This is a program that lets you interactively run your tests and gives immediate feedback on the results. You ll find it in the NUnitVersion\bin\net-2.0 folder in the NUnit zip archive. Because the CI unit test process needs to run with no user interaction, you won t need it on the CI server. But you ll use it now to demonstrate NUnit s testing capabilities. The source code included with this book contains more unit tests for you to browse and learn from. Launch the NUnit GUI test runner (see figure 6.2). Select File > Open Project, search for CiDotNet.Calc.Test.dll, and open it. NUnit will load the DLL and prepare everything for the tests. The left pane shows the assembly and the test methods you ve written. You can run all the tests together or mark separate tests to execute them independently. To start the test, click Run. The tests will run, and the results will be displayed in the NUnit GUI (see figure 6.3). Green means the tests passed and everything is all right. What you don t want to see is red, which means the tests failed; or yellow, which indicates that at least one test wasn t run. Let s make test results more colorful by creating one failing and one omitted test. In doing so, you ll learn some other NUnit attributes. Copy the CalculateRate() test, paste it into the same class, and change the name to IgnoreTest(). If you decorate it
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