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+<title>NUnit - Assertions</title>
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+
+<h2>Assertions</h2>
+
+<p>Assertions are central to unit testing in any of the xUnit frameworks, and NUnit
+ is no exception. NUnit provides a rich set of assertions as static methods of
+ the Assert class.</p>
+
+<p>If an assertion fails, the method call does not return and an error is reported.
+ If a test contains multiple assertions, any that follow the one that failed
+ will not be executed. For this reason, it's usually best to try for one
+ assertion per test.</p>
+
+<p>Each method may be called without a message, with a simple text message or with
+ a message and arguments. In the last case the message is formatted using the
+ provided text and arguments.</p>
+
+<h3>Two Models</h3>
+
+<p>Before NUnit 2.4, a separate method of the Assert class was used for each
+ different assertion. We call this the
+ <a href="classicModel.html">classic model</a>. It
+ continues to be supported in NUnit, since many people prefer it.</p>
+
+<p>Beginning with NUnit 2.4, a new
+ <a href="constraintModel.html">constraint-based model</a> is being
+ introduced. This approach uses a single method of the Assert class
+ for all assertions, passing a <b>constraint</b> object that specifies the
+ test to be performed.
+
+<p>This constraint-based model is now used internally by NUnit
+ for all assertions. The methods of the classic approach have been
+ re-implemented on top of this new model.
+</div>
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