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| 5 | <title>NUnit - ThrowsConstraint</title>
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| 24 |
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| 25 | <div id="content">
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| 26 |
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| 27 | <h2>Throws Constraint (NUnit 2.5)</h2>
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| 28 |
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| 29 | <p><b>ThrowsConstraint</b> is used to test that some code, represented as a delegate,
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| 30 | throws a particular exception. It may be used alone, to merely test the type
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| 31 | of constraint, or with an additional constraint to be applied to the exception
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| 32 | specified as an argument.
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| 33 |
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| 34 | p>The related <b>ThrowsNothingConstraint</b> simply asserts that the delegate
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| 35 | does not throw an exception.
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| 36 |
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| 37 | <h4>Constructors</h4>
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| 38 | <div class="code"><pre>
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| 39 | ThrowsConstraint(Type expectedType)
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| 40 | ThrowsConstraint<T>()
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| 41 | ThrowsConstraint(Type expectedType, Constraint constraint)
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| 42 | ThrowsConstraint<T>(Constraint constraint)
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| 43 | ThrowsNothingConstraint()
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| 44 | </pre></div>
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| 45 |
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| 46 | <h4>Syntax</h4>
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| 47 | <div class="code"><pre>
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| 48 | Throws.Exception
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| 49 | Throws.TargetInvocationException
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| 50 | Throws.ArgumentException
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| 51 | Throws.InvalidOperationException
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| 52 | Throws.TypeOf(Type expectedType)
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| 53 | Throws.TypeOf<T>()
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| 54 | Throws.InstanceOf(Type expectedType)
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| 55 | Throws.InstanceOf<T>()
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| 56 | Throws.Nothing
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| 57 | Throws.InnerException
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| 58 | </pre></div>
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| 59 |
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| 60 | <h4>Examples of Use</h4>
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| 61 | <div class="code"><pre>
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| 62 | // .NET 1.1
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| 63 | Assert.That( new TestDelegate(SomeMethod),
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| 64 | Throws.TypeOf(typeof(ArgumentException)));
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| 65 | Assert.That( new TestDelegate(SomeMethod),
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| 66 | Throws.Exception.TypeOf(typeof(ArgumentException)));
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| 67 | Assert.That( new TestDelegate(SomeMethod),
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| 68 | Throws.TypeOf(typeof(ArgumentException))
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| 69 | .With.Property("Parameter").EqualTo("myParam"));
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| 70 | Assert.That( new TestDelegate(SomeMethod),
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| 71 | Throws.ArgumentException );
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| 72 | Assert.That( new TestDelegate(SomeMethod),
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| 73 | Throws.TargetInvocationException
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| 74 | .With.InnerException.TypeOf(ArgumentException));
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| 75 |
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| 76 | // .NET 2.0
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| 77 | Assert.That( SomeMethod,
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| 78 | Throws.TypeOf<ArgumentException>());
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| 79 | Assert.That( SomeMethod,
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| 80 | Throws.Exception.TypeOf<ArgumentException>());
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| 81 | Assert.That( SomeMethod,
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| 82 | Throws.TypeOf<ArgumentException>()
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| 83 | .With.Property("Parameter").EqualTo("myParam"));
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| 84 | Assert.That( SomeMethod, Throws.ArgumentException );
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| 85 | Assert.That( SomeMethod,
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| 86 | Throws.TargetInvocationException
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| 87 | .With.InnerException.TypeOf<ArgumentException>());
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| 88 | </pre></div>
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| 89 |
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| 90 | <h4>Notes</h4>
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| 91 | <ol>
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| 92 | <li><b>Throws.Exception</b> may be followed by further constraints,
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| 93 | which are applied to the exception itself as shown in the last two
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| 94 | examples above. It may also be used alone to verify that some
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| 95 | exception has been thrown, without regard to type. This is
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| 96 | not a recommended practice since you should normally know
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| 97 | what exception you are expecting.
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| 98 | <li><b>Throws.TypeOf</b> and <b>Throws.InstanceOf</b> are provided
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| 99 | as a shorter syntax for this common test. They work exactly like
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| 100 | the corresponding forms following <b>Throws.Exception</b>.
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| 101 | <li><b>Throws.TargetInvocationException/b>, <b>Throws.ArgumentException</b>
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| 102 | and <b>Throws.InvalidOperationException</b> provide a shortened form
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| 103 | for some common exceptions.
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| 104 | <li>Used alone, <b>Throws.InnerException</b> simply tests the InnerException
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| 105 | value of the thrown exception. More commonly, it will be used in
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| 106 | combination with a test for the type of the outer exception as shown
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| 107 | in the examples above.
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| 108 | </ol>
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| 109 |
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| 110 |
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| 111 |
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| 117 | <li><a href="index.html">NUnit 2.5.10</a></li>
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| 118 | <ul>
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| 119 | <li><a href="getStarted.html">Getting Started</a></li>
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| 120 | <li><a href="assertions.html">Assertions</a></li>
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| 121 | <li><a href="constraintModel.html">Constraints</a></li>
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| 122 | <ul>
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| 123 | <li><a href="equalConstraint.html">Equal Constraint</a></li>
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| 124 | <li><a href="sameasConstraint.html">SameAs Constraint</a></li>
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| 125 | <li><a href="conditionConstraints.html">Condition Constraints</a></li>
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| 131 | <li><a href="propertyConstraint.html">Property Constraint</a></li>
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| 132 | <li id="current"><a href="throwsConstraint.html">Throws Constraint</a></li>
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| 133 | <li><a href="compoundConstraints.html">Compound Constraints</a></li>
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| 134 | <li><a href="delayedConstraint.html">Delayed Constraint</a></li>
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| 135 | <li><a href="listMapper.html">List Mapper</a></li>
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| 136 | <li><a href="reusableConstraint.html">Reusable Constraint</a></li>
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| 137 | </ul>
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