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<h2>List Mapper (NUnit 2.4.2)</h2>
<p>Unlike Constraint classes, <b>ListMapper</b> is used to modify the actual
value argument to Assert.That(). It transforms the actual value, which
must be a collection, creating a new collection to be tested against the
supplied constraint. Currently, ListMapper supports one transformation: creating
a collection of property values.
<p>Normally, ListMapper will be used through the <b>List.Map()</b> syntax helper
or the inherited syntax equivalent, <b>Map()</b>. The following example
shows three forms of the same assert:
<div class="code"><pre>
string[] strings = new string[] { "a", "ab", "abc" };
int[] lengths = new int[] { 1, 2, 3 };
Assert.That(List.Map(strings).Property("Length"),
Is.EqualTo(lengths));
Assert.That(new ListMapper(strings).Property("Length"),
Is.EqualTo(lengths));
// Assuming inheritance from AssertionHelper
Expect(Map(strings).Property("Length"), EqualTo(lengths));
</pre></div>
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