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<h2>Property Constraint (NUnit 2.4.2)</h2>
<p>PropertyConstraint is used to test for existence of a named property and
optionally tests its value. It may also be used as a prefix for other constraints
to be applied to the property.
<table class="constraints">
<tr><th>Syntax Helper</th><th>Constructor</th><th>Operation</th></tr>
<tr><td>Has.Property( string )</td><td>PropertyConstraint( string )</td></td><td>tests that a specific property exists</td></tr>
<tr><td>Has.Property( string, object )</td><td>PropertyConstraint( string, object )</td></td><td>tests that the value of a property is equal to the value provided</td></tr>
<tr><td>Has.Property( string, Constraint)...</td><td>PropertyConstraint</td></td><td>applies the following constraint to the value of a named property</td></tr>
<tr><td>Has.Length( int )</td><td>PropertyConstraint</td></td><td>tests that the object's Length property is equal to the value given</td></tr>
<tr><td>Has.Count( int )</td><td>PropertyConstraint</td></td><td>tests that the object's Count property is equal to the value given</td></tr>
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