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<h2>Throws Constraint (NUnit 2.5)</h2>
<p><b>ThrowsConstraint</b> is used to test that some code, represented as a delegate,
throws a particular exception. It may be used alone, to merely test the type
of constraint, or with an additional constraint to be applied to the exception
specified as an argument.
p>The related <b>ThrowsNothingConstraint</b> simply asserts that the delegate
does not throw an exception.
<h4>Constructors</h4>
<div class="code"><pre>
ThrowsConstraint(Type expectedType)
ThrowsConstraint<T>()
ThrowsConstraint(Type expectedType, Constraint constraint)
ThrowsConstraint<T>(Constraint constraint)
ThrowsNothingConstraint()
</pre></div>
<h4>Syntax</h4>
<div class="code"><pre>
Throws.Exception
Throws.TargetInvocationException
Throws.ArgumentException
Throws.InvalidOperationException
Throws.TypeOf(Type expectedType)
Throws.TypeOf<T>()
Throws.InstanceOf(Type expectedType)
Throws.InstanceOf<T>()
Throws.Nothing
Throws.InnerException
</pre></div>
<h4>Examples of Use</h4>
<div class="code"><pre>
// .NET 1.1
Assert.That( new TestDelegate(SomeMethod),
Throws.TypeOf(typeof(ArgumentException)));
Assert.That( new TestDelegate(SomeMethod),
Throws.Exception.TypeOf(typeof(ArgumentException)));
Assert.That( new TestDelegate(SomeMethod),
Throws.TypeOf(typeof(ArgumentException))
.With.Property("Parameter").EqualTo("myParam"));
Assert.That( new TestDelegate(SomeMethod),
Throws.ArgumentException );
Assert.That( new TestDelegate(SomeMethod),
Throws.TargetInvocationException
.With.InnerException.TypeOf(ArgumentException));
// .NET 2.0
Assert.That( SomeMethod,
Throws.TypeOf<ArgumentException>());
Assert.That( SomeMethod,
Throws.Exception.TypeOf<ArgumentException>());
Assert.That( SomeMethod,
Throws.TypeOf<ArgumentException>()
.With.Property("Parameter").EqualTo("myParam"));
Assert.That( SomeMethod, Throws.ArgumentException );
Assert.That( SomeMethod,
Throws.TargetInvocationException
.With.InnerException.TypeOf<ArgumentException>());
</pre></div>
<h4>Notes</h4>
<ol>
<li><b>Throws.Exception</b> may be followed by further constraints,
which are applied to the exception itself as shown in the last two
examples above. It may also be used alone to verify that some
exception has been thrown, without regard to type. This is
not a recommended practice since you should normally know
what exception you are expecting.
<li><b>Throws.TypeOf</b> and <b>Throws.InstanceOf</b> are provided
as a shorter syntax for this common test. They work exactly like
the corresponding forms following <b>Throws.Exception</b>.
<li><b>Throws.TargetInvocationException/b>, <b>Throws.ArgumentException</b>
and <b>Throws.InvalidOperationException</b> provide a shortened form
for some common exceptions.
<li>Used alone, <b>Throws.InnerException</b> simply tests the InnerException
value of the thrown exception. More commonly, it will be used in
combination with a test for the type of the outer exception as shown
in the examples above.
</ol>
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