2 Why We Need Model-Based Testing

Overview 25
assembly. Attributes can have parameters: the attribute [Category("Convert")] indicates
that the following method belongs to the category named Convert; the test
runner can be commanded to execute only the tests that belong to a particular
category.
Assertions check whether tests passed or failed. In NUnit, assertions are calls to
methods in its Assert class, such as the calls to Assert.AreEqual that appear in our
Test class. Each assertion checks a condition. If the condition is false, the assertion
throws an exception that is caught by the test runner, which reports a test failure.
To build the tests, compile your test class, referencing both the libraries you are
testing (the IUT) and the NUnit library. This creates another library that contains
your tests.
csc /target:library /reference:Client.dll,Server.dll,Temperature.dll ˆ
/reference:"%PROGRAMFILES%\NUnit-Net-2.0 2.2.8\bin\nunit.framework.dll" ˆ
Tests.cs
To execute the tests, run one of the NUnit test runner applications, identifying
your test library on the command line or in the GUI. This command runs the command
line test runner.
nunit-console /include=Convert Tests.dll
The test results appear on the console:
Included categories: Convert
..F
Tests run: 2, Failures: 1, Not run: 0, Time: 0.501 seconds
Failures:
1) ClientServerImpl.Tests.ConvertMany :
expected:
but was:
at ClientServerImpl.Tests.ConvertMany()
This report says two tests were run and one failed, and provides some information
about the failure. In the next section we will take a closer look at those tests.
2.7 Some simple scenarios
Our Tests class includes two test methods, Convert and ConvertMany, for testing
the ConvertToCelsius method in our Temperature class (Figure 2.9). NUnit test
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