168 lines
6.4 KiB
HTML
168 lines
6.4 KiB
HTML
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<title>NUnit - ConstraintModel</title>
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<a href="http://www.nunit.org">NUnit</a>
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<h2>Constraint-Based Assert Model (NUnit 2.4)</h2>
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<p>The constraint-based Assert model uses a single method of the Assert class
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for all assertions. The logic necessary to carry out each assertion is
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embedded in the constraint object passed as the second parameter to that
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method.
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<p>Here's a very simple assert using the constraint model:
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<pre> Assert.That( myString, Is.EqualTo("Hello") );</pre>
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<p>The second argument in this assertion uses one of NUnit's <b>syntax helpers</b>
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to create an <b>EqualConstraint</b>. The same assertion could also be made in this form:
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<pre> Assert.That( myString, new EqualConstraint("Hello") );</pre>
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<p>Using this model, all assertions are made using one of the forms of the
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Assert.That() method, which has a number of overloads...
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<div class="code" style="width: 36em">
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<pre>
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Assert.That( object actual, IResolveConstraint constraint )
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Assert.That( object actual, IResolveConstraint constraint,
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string message )
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Assert.That( object actual, IResolveConstraint constraint,
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string message, object[] parms )
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Assert.That( ActualValueDelegate del, IResolveConstraint constraint )
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Assert.That( ActualValueDelegate del, IResolveConstraint constraint,
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string message )
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Assert.That( ActualValueDelegate del, IResolveConstraint constraint,
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string message, object[] parms )
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Assert.That<T>( ref T actual, IResolveConstraint constraint )
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Assert.That<T>( ref T actual, IResolveConstraint constraint,
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string message )
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Assert.That<T>( ref T actual, IResolveConstraint constraint,
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string message, object[] parms )
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Assert.That( bool condition );
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Assert.That( bool condition, string message );
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Assert.That( bool condition, string message, object[] parms );
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Assert.That( TestDelegate del, IResolveConstraint constraint );
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</pre>
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</div>
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<p>If you derive your test fixture class from <b>AssertionHelper</b>, the
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Expect() method may be used in place of Assert.That()...
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<div class="code" style="width: 36em">
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<pre>
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Expect( object actual, IResolveConstraint constraint )
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Expect( object actual, IResolveConstraint constraint,
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string message )
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Expect( object actual, IResolveConstraint constraint,
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string message, object[] parms )
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Expect( ActualValueDelegate del, IResolveConstraint constraint )
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Expect( ActualValueDelegate del, IResolveConstraint constraint,
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string message )
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Expect( ActualValueDelegate del, IResolveConstraint constraint,
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string message, object[] parms )
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Expect<T>( ref T actual, IResolveConstraint constraint )
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Expect<T>( ref T actual, IResolveConstraint constraint,
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string message )
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Expect<T>( ref T actual, IResolveConstraint constraint,
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string message, object[] parms )
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Expect( bool condition );
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Expect( bool condition, string message );
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Expect( bool condition, string message, object[] parms );
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Expect( TestDelegate del, IResolveConstraint constraint );
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</pre>
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</div>
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<p>The overloads that take a bool work exactly like Assert.IsTrue.
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<p>For overloads taking a constraint, the argument must be a object implementing
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the <b>IConstraint</b> interface, which supports performing a test
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on an actual value and generating appropriate messages. This interface
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is described in more detail under
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<a href="customConstraints.html">Custom Constraints</a>.
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<p>NUnit provides a number of constraint classes similar to the <b>EqualConstraint</b>
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used in the example above. Generally, these classes may be used directly or
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through a syntax helper. Test fixture classes inheriting from <b>AssertionHelper</b>
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are able to use shorter forms. The valid forms are described on the pages related to
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each constraint. Note that the menu items listed to the right generally reflect the
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names of the syntax helpers.
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<p><b>See also:</b> the
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<a href="classicModel.html">classic model</a> of assertions.
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<li><a href="index.html">NUnit 2.5.9</a></li>
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<li><a href="getStarted.html">Getting Started</a></li>
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<li><a href="assertions.html">Assertions</a></li>
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<li id="current"><a href="constraintModel.html">Constraints</a></li>
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<li><a href="equalConstraint.html">Equal Constraint</a></li>
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<li><a href="sameasConstraint.html">SameAs Constraint</a></li>
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<li><a href="conditionConstraints.html">Condition Constraints</a></li>
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<li><a href="propertyConstraint.html">Property Constraint</a></li>
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<li><a href="compoundConstraints.html">Compound Constraints</a></li>
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<li><a href="delayedConstraint.html">Delayed Constraint</a></li>
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<li><a href="listMapper.html">List Mapper</a></li>
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