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| 25 | <div id="content">
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| 26 |
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| 27 | <h2>List Mapper (NUnit 2.4.2)</h2>
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| 28 |
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| 29 | <p>Unlike Constraint classes, <b>ListMapper</b> is used to modify the actual
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| 30 | value argument to Assert.That(). It transforms the actual value, which
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| 31 | must be a collection, creating a new collection to be tested against the
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| 32 | supplied constraint. Currently, ListMapper supports one transformation: creating
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| 33 | a collection of property values.
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| 34 |
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| 35 | <p>Normally, ListMapper will be used through the <b>List.Map()</b> syntax helper
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| 36 | or the inherited syntax equivalent, <b>Map()</b>. The following example
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| 37 | shows three forms of the same assert:
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| 38 |
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| 39 | <div class="code"><pre>
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| 40 | string[] strings = new string[] { "a", "ab", "abc" };
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| 41 | int[] lengths = new int[] { 1, 2, 3 };
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| 42 |
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| 43 | Assert.That(List.Map(strings).Property("Length"),
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| 44 | Is.EqualTo(lengths));
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| 45 |
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| 46 | Assert.That(new ListMapper(strings).Property("Length"),
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| 47 | Is.EqualTo(lengths));
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| 48 |
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| 49 | // Assuming inheritance from AssertionHelper
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| 50 | Expect(Map(strings).Property("Length"), EqualTo(lengths));
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| 51 | </pre></div>
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| 64 | <ul>
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