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| 25 | <div id="content">
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| 26 |
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| 27 | <h3>Tips for Writing Extensions</h3>
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| 28 |
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| 29 | <p>An Extenders Guide will be published in the future. At the moment, writing an
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| 30 | extension is a bit of an adventure. Extension authors are advised to join the
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| 31 | nunit-developer list and post questions and comments there.
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| 32 |
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| 33 | <p>For the moment, the following tips may be of assistance.
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| 34 | <ul>
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| 35 | <li>The <b>nunit.core.interfaces</b> assembly is intended to be stable in the future
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| 36 | while the <b>nunit.core</b> assembly will change from release to release. Right now,
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| 37 | both assemblies are still in flux, but extensions that depend solely on the interfaces
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| 38 | assembly will have a much better chance of surviving NUnit version changes. Unfortunately,
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| 39 | this is rather difficult to do without duplicating a great deal of NUnit code. Most
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| 40 | of the add-in samples provided with NUnit are currently version dependent.
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| 41 |
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| 42 | <li>If you place the definition of a custom attribute in the same assembly as your
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| 43 | add-in, then user tests are dependent on the add-in assembly. If the add-in is
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| 44 | version-dependent, then the user tests will also be version-dependent. We suggest
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| 45 | placing any types referenced by user tests in a separate assembly, particularly if
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| 46 | your extension relies on nunit.core.
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| 47 |
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| 48 | <li>If using Visual Studio, set Copy Local to false for any references to nunit.core
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| 49 | or nunit.core.interfaces. This is especially important if you are also building
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| 50 | NUnit itself.
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| 51 |
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| 52 | <li>There is currently no mechanism to allow decorators to apply in a particular order.
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| 53 | NUnit applies decorators in the order in which they are returned through reflection,
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| 54 | which may vary among different runtimes.
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| 55 |
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| 56 | <li>Avoid trying to "stretch" the existing extension points to do more than they were
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| 57 | intended to do. Rather, let us know what further extension points you would like to see!
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| 58 | </ul>
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| 66 | <li><a href="index.html">NUnit 2.5.10</a></li>
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| 69 | <li><a href="assertions.html">Assertions</a></li>
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| 70 | <li><a href="constraintModel.html">Constraints</a></li>
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| 71 | <li><a href="attributes.html">Attributes</a></li>
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| 72 | <li><a href="runningTests.html">Running Tests</a></li>
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| 73 | <li><a href="extensibility.html">Extensibility</a></li>
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| 77 | <li id="current"><a href="extensionTips.html">Tips for Extenders</a></li>
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| 78 | </ul>
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| 90 | Copyright © 2010 Charlie Poole. All Rights Reserved.
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