95 строки
2.9 KiB
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95 строки
2.9 KiB
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<title>NUnit - CustomConstraints</title>
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<h2>Custom Constraints (NUnit 2.4)</h2>
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<p>You can implement your own custom constraints by creating a class that
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inherits from the <b>Constraint</b> abstract class, which supports performing a
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test on an actual value and generating appropriate messages. The class includes
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two abstract methods, which you must override and two virtual methods which
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may be overridden as needed:
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<div class="code" style="width: 36em">
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<pre>public abstract class Constraint
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{
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...
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public abstract bool Matches( object actual );
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public abstract void WriteDescriptionTo( MessageWriter writer );
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public virtual void WriteMessageTo( MessageWriter writer );
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public virtual void WriteActualValueTo( MessageWriter writer );
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...
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}</pre>
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</div>
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<p>Your derived class should save the actual argument to Matches in the protected
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field actual for later use.
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<p>The MessageWriter abstract class is implemented in the framework by
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TextMessageWriter. Examining the source for some of the builtin constraints
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should give you a good idea of how to use it.
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