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| 24 |
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| 25 | <div id="content">
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| 26 |
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| 27 | <h2>Assertions</h2>
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| 28 |
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| 29 | <p>Assertions are central to unit testing in any of the xUnit frameworks, and NUnit
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| 30 | is no exception. NUnit provides a rich set of assertions as static methods of
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| 31 | the Assert class.</p>
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| 32 |
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| 33 | <p>If an assertion fails, the method call does not return and an error is reported.
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| 34 | If a test contains multiple assertions, any that follow the one that failed
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| 35 | will not be executed. For this reason, it's usually best to try for one
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| 36 | assertion per test.</p>
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| 37 |
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| 38 | <p>Each method may be called without a message, with a simple text message or with
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| 39 | a message and arguments. In the last case the message is formatted using the
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| 40 | provided text and arguments.</p>
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| 41 |
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| 42 | <h3>Two Models</h3>
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| 43 |
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| 44 | <p>Before NUnit 2.4, a separate method of the Assert class was used for each
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| 45 | different assertion. We call this the "Classic Model." It
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| 46 | continues to be supported in NUnit, since many people prefer it.</p>
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| 47 |
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| 48 | <p>Beginning with NUnit 2.4, a new "Constraint-based" model was
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| 49 | introduced. This approach uses a single method of the Assert class
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| 50 | for all assertions, passing a <a href="constraintModel.html">Constraint</a> object that specifies the test to be performed.
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| 51 |
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| 52 | <p>This constraint-based model is now used internally by NUnit
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| 53 | for all assertions. The methods of the classic approach have been
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| 54 | re-implemented on top of this new model.
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| 55 |
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| 56 | <!--
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| 57 | <h4>See Also...</h4>
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| 68 | <li><a href="index.html">NUnit 2.5.10</a></li>
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| 69 | <ul>
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| 70 | <li><a href="getStarted.html">Getting Started</a></li>
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| 71 | <li id="current"><a href="assertions.html">Assertions</a></li>
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| 72 | <ul>
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| 73 | <li><a href="equalityAsserts.html">Equality Asserts</a></li>
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| 74 | <li><a href="identityAsserts.html">Identity Asserts</a></li>
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| 75 | <li><a href="conditionAsserts.html">Condition Asserts</a></li>
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| 78 | <li><a href="exceptionAsserts.html">Exception Asserts</a></li>
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| 79 | <li><a href="utilityAsserts.html">Utility Methods</a></li>
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| 80 | <li><a href="stringAssert.html">String Assert</a></li>
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| 81 | <li><a href="collectionAssert.html">Collection Assert</a></li>
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| 82 | <li><a href="fileAssert.html">File Assert</a></li>
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| 83 | <li><a href="directoryAssert.html">Directory Assert</a></li>
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| 84 | </ul>
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| 85 | <li><a href="constraintModel.html">Constraints</a></li>
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| 86 | <li><a href="attributes.html">Attributes</a></li>
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| 100 | Copyright © 2010 Charlie Poole. All Rights Reserved.
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