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| 14 |
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| 15 | <!-- Standard Header for NUnit.org -->
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| 16 | <div id="header">
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| 17 | <a id="logo" href="http://www.nunit.org"><img src="img/logo.gif" alt="NUnit.org" title="NUnit.org"></a>
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| 23 | <!-- End of Header -->
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| 24 |
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| 25 | <div id="content">
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| 26 |
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| 27 | <script language="JavaScript" src="codeFuncs.js" ></script> <!-- Do it this way for IE -->
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| 28 |
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| 29 | <h3>TestFixtureAttribute (NUnit 2.0 / 2.5)</h3>
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| 30 |
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| 31 | <p>This is the attribute that marks a class that contains tests and, optionally,
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| 32 | setup or teardown methods. NUnit 2.5 introduces parameterized and generic
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| 33 | test fixtures - see below.</p>
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| 34 |
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| 35 | <p>Most restrictions on a class that is used as a test fixture have now been
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| 36 | eliminated. As of NUnit 2.5.3, a test fixture class:
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| 37 | <ul>
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| 38 | <li>May be public, protected, private or internal.
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| 39 | <li>May be a static class in .NET 2.0 or later.
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| 40 | <li>May be generic, so long as any type parameters are provided or
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| 41 | can be inferred from the actual arguments.
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| 42 | <li>May not be abstract - although the attribute may be applied to an
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| 43 | abstract class intended to serve as a base class for test fixtures.
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| 44 | <li>If no arguments are provided with the TestFixtureAttribute, the class
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| 45 | must have a default constructor.
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| 46 | <li>If arguments are provided, they must match one of the constructors.
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| 47 | </ul>
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| 48 | </p>
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| 49 |
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| 50 | <p>If any of these restrictions are violated, the class is not runnable
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| 51 | as a test and will display as an error.</p>
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| 52 |
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| 53 | <p>It is advisable that the constructor not have any side effects,
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| 54 | since NUnit may construct the object multiple times in the course of a session.</li>
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| 55 |
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| 56 | <p>Beginning with NUnit 2.5, the <b>TestFixture</b> attribute is optional
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| 57 | for non-parameterized, non-generic fixtures. So long as the class contains
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| 58 | at least one method marked with the <b>Test</b>, <b>TestCase</b> or
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| 59 | <b>TestCaseSource</b> attribute, it will be treated as a test fixture.
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| 60 |
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| 61 | <h4>Example:</h4>
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| 62 |
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| 63 | <div class="code">
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| 64 |
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| 65 | <div class="langFilter">
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| 66 | <a href="javascript:Show('DD1')" onmouseover="Show('DD1')"><img src="img/langFilter.gif" width="14" height="14" alt="Language Filter"></a>
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| 67 | <div id="DD1" class="dropdown" style="display: none;" onclick="Hide('DD1')">
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| 68 | <a href="javascript:ShowCS()">C#</a><br>
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| 69 | <a href="javascript:ShowVB()">VB</a><br>
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| 70 | <a href="javascript:ShowMC()">C++</a><br>
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| 71 | <a href="javascript:ShowJS()">J#</a><br>
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| 72 | </div>
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| 73 | </div>
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| 74 |
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| 75 | <pre class="cs">namespace NUnit.Tests
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| 76 | {
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| 77 | using System;
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| 78 | using NUnit.Framework;
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| 79 |
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| 80 | [TestFixture]
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| 81 | public class SuccessTests
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| 82 | {
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| 83 | // ...
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| 84 | }
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| 85 | }
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| 86 | </pre>
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| 87 |
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| 88 | <pre class="vb">Imports System
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| 89 | Imports Nunit.Framework
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| 90 |
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| 91 | Namespace Nunit.Tests
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| 92 |
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| 93 | <TestFixture()> Public Class SuccessTests
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| 94 | ' ...
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| 95 | End Class
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| 96 | End Namespace
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| 97 | </pre>
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| 98 |
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| 99 | <pre class="mc">#using <Nunit.Framework.dll>
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| 100 | using namespace System;
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| 101 | using namespace NUnit::Framework;
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| 102 |
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| 103 | namespace NUnitTests
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| 104 | {
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| 105 | [TestFixture]
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| 106 | public __gc class SuccessTests
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| 107 | {
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| 108 | // ...
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| 109 | };
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| 110 | }
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| 111 |
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| 112 | #include "cppsample.h"
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| 113 |
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| 114 | namespace NUnitTests {
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| 115 | // ...
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| 116 | }
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| 117 | </pre>
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| 118 |
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| 119 | <pre class="js">package NUnit.Tests;
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| 120 |
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| 121 | import System.*;
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| 122 | import NUnit.Framework.TestFixture;
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| 123 |
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| 124 |
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| 125 | /** @attribute NUnit.Framework.TestFixture() */
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| 126 | public class SuccessTests
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| 127 | {
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| 128 | // ...
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| 129 | }
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| 130 | </pre>
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| 131 |
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| 132 | </div>
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| 133 |
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| 134 | <h3>Inheritance</h3>
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| 135 |
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| 136 | <p>The <b>TestFixtureAttribute</b> may be applied to a base class and is
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| 137 | inherited by any derived classes. This includes any abstract base class,
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| 138 | so the well-known Abstract Fixture pattern may be implemented if desired.
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| 139 |
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| 140 | <p>In order to facilitate use of generic and/or parameterized classes,
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| 141 | where the derived class may require a different number of arguments (or
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| 142 | type arguments) from the base class, superfluous <b>TestFixture</b>
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| 143 | attributes are ignored, using the following rules:
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| 144 |
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| 145 | <ol>
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| 146 | <li>If all TestFixture attributes provide constructor or type arguments,
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| 147 | then all of them are used.
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| 148 | <li>If some of the attributes provide arguments and others do not, then
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| 149 | only those with arguments are used and those without arguments are ignored.
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| 150 | <li>If none of the attributes provide arguments, one of them is selected
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| 151 | for use by NUnit. It is not possible to predict which will be used, so
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| 152 | this situation should generally be avoided.
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| 153 | </ol>
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| 154 |
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| 155 | This permits code like the following, which would cause an error if the
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| 156 | attribute on the base class were not ignored.
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| 157 |
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| 158 | <div class="code">
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| 159 | <pre>[TestFixture]
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| 160 | public class AbstractFixtureBase
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| 161 | {
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| 162 | ...
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| 163 | }
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| 164 |
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| 165 | [TestFixture(typeof(string))]
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| 166 | public class DerivedFixture<T> : AbstractFixtureBase
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| 167 | {
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| 168 | ...
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| 169 | }
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| 170 | </pre>
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| 171 | </div>
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| 172 |
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| 173 | <h3>Parameterized Test Fixtures (NUnit 2.5)</h3>
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| 174 |
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| 175 | <p>Beginning with NUnit 2.5, test fixtures may take constructor arguments.
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| 176 | Argument values are specified as arguments to the <b>TestFixture</b>
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| 177 | attribute. NUnit will construct a separate instance of the fixture
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| 178 | for each set of arguments.
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| 179 |
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| 180 | <p>Individual fixture instances in a set of parameterized fixtures may be ignored.
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| 181 | Set the <b>Ignore</b> named parameter of the attribute to true or set
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| 182 | <b>IgnoreReason</b> to a non-empty string.
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| 183 |
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| 184 | <p>Individual fixture instances may be given categories as well. Set the <b>Category</b>
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| 185 | named parameter of the attribute to the name of the category or to a comma-separated
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| 186 | list of categories.
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| 187 |
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| 188 | <h4>Example</h4>
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| 189 |
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| 190 | <p>The following test fixture would be instantiated by NUnit three times,
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| 191 | passing in each set of arguments to the appropriate constructor. Note
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| 192 | that there are three different constructors, matching the data types
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| 193 | provided as arguments.
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| 194 |
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| 195 | <div class="code"><pre>
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| 196 | [TestFixture("hello", "hello", "goodbye")]
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| 197 | [TestFixture("zip", "zip")]
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| 198 | [TestFixture(42, 42, 99)]
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| 199 | public class ParameterizedTestFixture
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| 200 | {
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| 201 | private string eq1;
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| 202 | private string eq2;
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| 203 | private string neq;
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| 204 |
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| 205 | public ParameterizedTestFixture(string eq1, string eq2, string neq)
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| 206 | {
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| 207 | this.eq1 = eq1;
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| 208 | this.eq2 = eq2;
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| 209 | this.neq = neq;
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| 210 | }
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| 211 |
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| 212 | public ParameterizedTestFixture(string eq1, string eq2)
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| 213 | : this(eq1, eq2, null) { }
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| 214 |
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| 215 | public ParameterizedTestFixture(int eq1, int eq2, int neq)
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| 216 | {
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| 217 | this.eq1 = eq1.ToString();
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| 218 | this.eq2 = eq2.ToString();
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| 219 | this.neq = neq.ToString();
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| 220 | }
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| 221 |
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| 222 | [Test]
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| 223 | public void TestEquality()
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| 224 | {
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| 225 | Assert.AreEqual(eq1, eq2);
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| 226 | if (eq1 != null && eq2 != null)
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| 227 | Assert.AreEqual(eq1.GetHashCode(), eq2.GetHashCode());
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| 228 | }
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| 229 |
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| 230 | [Test]
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| 231 | public void TestInequality()
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| 232 | {
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| 233 | Assert.AreNotEqual(eq1, neq);
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| 234 | if (eq1 != null && neq != null)
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| 235 | Assert.AreNotEqual(eq1.GetHashCode(), neq.GetHashCode());
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| 236 | }
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| 237 | }
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| 238 | </pre></div>
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| 239 |
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| 240 | <h3>Generic Test Fixtures (NUnit 2.5)</h3>
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| 241 |
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| 242 | <p>Beginning with NUnit 2.5, you may also use a generic class as a test fixture.
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| 243 | In order for NUnit to instantiate the fixture, you must either specify the
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| 244 | types to be used as arguments to <b>TestFixtureAttribute</b> or use the
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| 245 | named parameter <b>TypeArgs=</b> to specify them. NUnit will construct a
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| 246 | separate instance of the fixture for each <b>TestFixtureAttribute</b>
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| 247 | you provide.
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| 248 |
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| 249 | <h4>Example</h4>
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| 250 |
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| 251 | <p>The following test fixture would be instantiated by NUnit twice,
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| 252 | once using an ArrayList and once using a List<int>.
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| 253 |
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| 254 | <div class="code"><pre>
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| 255 | [TestFixture(typeof(ArrayList))]
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| 256 | [TestFixture(typeof(List<int>))]
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| 257 | public class IList_Tests<TList> where TList : IList, new()
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| 258 | {
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| 259 | private IList list;
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| 260 |
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| 261 | [SetUp]
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| 262 | public void CreateList()
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| 263 | {
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| 264 | this.list = new TList();
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| 265 | }
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| 266 |
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| 267 | [Test]
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| 268 | public void CanAddToList()
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| 269 | {
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| 270 | list.Add(1); list.Add(2); list.Add(3);
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| 271 | Assert.AreEqual(3, list.Count);
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| 272 | }
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| 273 | }</pre></div>
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| 274 |
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| 275 | <h3>Generic Test Fixtures with Parameters (NUnit 2.5)</h3>
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| 276 |
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| 277 | <p>If a Generic fixture, uses constructor arguments, there are three
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| 278 | approaches to telling NUnit which arguments are type parameters
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| 279 | and which are normal constructor parameters.
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| 280 | <ol>
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| 281 | <li>Specify both sets of parameters as arguments to the <b>TestFixtureAttribute</b>.
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| 282 | Leading <b>System.Type</b> arguments are used as type parameters, while
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| 283 | any remaining arguments are used to construct the instance. In the
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| 284 | following example, this leads to some obvious duplication...
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| 285 |
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| 286 | <div class="code"><pre>
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| 287 | [TestFixture(typeof(double), typeof(int), 100.0, 42)]
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| 288 | [TestFixture(typeof(int) typeof(double), 42, 100.0)]
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| 289 | public class SpecifyBothSetsOfArgs<T1, T2>
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| 290 | {
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| 291 | T1 t1;
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| 292 | T2 t2;
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| 293 |
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| 294 | public SpecifyBothSetsOfArgs(T1 t1, T2 t2)
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| 295 | {
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| 296 | this.t1 = t1;
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| 297 | this.t2 = t2;
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| 298 | }
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| 299 |
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| 300 | [TestCase(5, 7)]
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| 301 | public void TestMyArgTypes(T1 t1, T2 t2)
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| 302 | {
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| 303 | Assert.That(t1, Is.TypeOf<T1>());
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| 304 | Assert.That(t2, Is.TypeOf<T2>());
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| 305 | }
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| 306 | }</pre></div>
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| 307 |
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| 308 | <li>Specify normal parameters as arguments to <b>TestFixtureAttribute</b>
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| 309 | and use the named parameter <b>TypeArgs=</b> to specify the type
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| 310 | arguments. Again, for this example, the type info is duplicated, but
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| 311 | it is at least more cleanly separated from the normal arguments...
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| 312 |
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| 313 | <div class="code" style="width: 40em"><pre>
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| 314 | [TestFixture(100.0, 42, TypeArgs=new Type[] {typeof(double), typeof(int) } )]
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| 315 | [TestFixture(42, 100.0, TypeArgs=new Type[] {typeof(int), typeof(double) } )]
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| 316 | public class SpecifyTypeArgsSeparately<T1, T2>
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| 317 | {
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| 318 | T1 t1;
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| 319 | T2 t2;
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| 320 |
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| 321 | public SpecifyTypeArgsSeparately(T1 t1, T2 t2)
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| 322 | {
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| 323 | this.t1 = t1;
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| 324 | this.t2 = t2;
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| 325 | }
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| 326 |
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| 327 | [TestCase(5, 7)]
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| 328 | public void TestMyArgTypes(T1 t1, T2 t2)
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| 329 | {
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| 330 | Assert.That(t1, Is.TypeOf<T1>());
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| 331 | Assert.That(t2, Is.TypeOf<T2>());
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| 332 | }
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| 333 | }</pre></div>
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| 334 |
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| 335 | <li>In some cases, when the constructor makes use of all the type parameters
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| 336 | NUnit may simply be able to deduce them from the arguments provided.
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| 337 | That's the case here and the following is the preferred way to
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| 338 | write this example...
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| 339 |
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| 340 | <div class="code"><pre>
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| 341 | [TestFixture(100.0, 42)]
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| 342 | [TestFixture(42, 100.0)]
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| 343 | public class DeduceTypeArgsFromArgs<T1, T2>
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| 344 | {
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| 345 | T1 t1;
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| 346 | T2 t2;
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| 347 |
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| 348 | public DeduceTypeArgsFromArgs(T1 t1, T2 t2)
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| 349 | {
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| 350 | this.t1 = t1;
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| 351 | this.t2 = t2;
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| 352 | }
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| 353 |
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| 354 | [TestCase(5, 7)]
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| 355 | public void TestMyArgTypes(T1 t1, T2 t2)
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| 356 | {
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| 357 | Assert.That(t1, Is.TypeOf<T1>());
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| 358 | Assert.That(t2, Is.TypeOf<T2>());
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| 359 | }
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| 360 | }</pre></div>
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| 361 | </ol>
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| 362 |
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| 363 | </div>
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| 364 |
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