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<h2>Condition Constraints (NUnit 2.4)</h2>
<p>ConditionConstraints test a specific condition and are named for the condition
they test. They verify that the actual value satisfies the condition. The
following condition helpers are provided.
<table class="constraints">
<tr><th>Syntax Helper</th><th>Constructor</th><th>Operation</th></tr>
<tr><td>Is.Null</td><td>EqualConstraint( null )</td></td><td>tests for null</td></tr>
<tr><td>Is.True</td><td>EqualConstraint( true )</td></td><td>tests for <b>true</b></td></tr>
<tr><td>Is.False</td><td>EqualConstraint( false )</td></td><td>tests for <b>false</b></td></tr>
<tr><td>Is.NaN</td><td>EqualConstraint( double.NaN )<br>EqualConstraint( float.NaN )</td></td><td>tests for floating NaN</td></tr>
<tr><td>Is.Empty</td><td>EmptyConstraint()</td></td><td>tests for empty string or collection</td></tr>
<tr><td>Is.Unique</td><td>UniqueItemsConstraint()</td></td><td>tests that collection contains unique items</td></tr>
</table>
<h4>Examples</h4>
<div class="code"><pre>
Assert.That( anObject, Is.Null );
Assert.That( anObject, Is.Not.Null );
Assert.That( condition, Is.True );
Assert.That( condition, Is.False );
Assert.That( aDouble, Is.NaN );
Assert.That( aDouble, Is.Not.NaN );
Assert.That( aString, Is.Empty );
Assert.That( collection, Is.Empty );
Assert.That( collection, Is.Unique );
// Using inheritance
Expect( aDouble, NaN );
Expect( collection, Unique );
</pre></div>
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