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| 25 | <div id="content">
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| 26 |
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| 27 | <h3>TestCaseProviders (NUnit 2.5)</h3>
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| 28 |
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| 29 | <h4>Purpose</h4>
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| 30 | <p>TestCaseProviders are used with parameterized tests to provide the
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| 31 | specific test cases that will be used in calling the test.
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| 32 |
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| 33 | <h4>Extension Point</h4>
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| 34 | <p>Addins use the host to access this extension point by name:
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| 35 |
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| 36 | <pre>
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| 37 | IExtensionPoint listeners = host.GetExtensionPoint( "ParameterProviders" );</pre>
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| 38 |
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| 39 | <h4>Interface</h4>
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| 40 | <p>The extension object passed to Install must implement either the
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| 41 | <b>ITestCaseProvider</b> or the <b>ITestCaseProvider2</b> interface:
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| 42 |
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| 43 | <pre>
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| 44 | public interface ITestCaseProvider
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| 45 | {
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| 46 | bool HasTestCasesFor( MethodInfo method );
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| 47 | IEnumerable GetTestCasesFor( MethodInfo method );
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| 48 | }
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| 49 |
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| 50 | public interface ITestCaseProvider2 : ITestCaseProvider
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| 51 | {
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| 52 | bool HasTestCasesFor( MethodInfo method, Test suite );
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| 53 | IEnumerable GetTestCasesFor( MethodInfo method, Test suite );
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| 54 | }
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| 55 | </pre>
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| 56 |
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| 57 | <p>NUnit will call <b>ITestCaseProvider2</b> if it is available. Otherwise
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| 58 | <b>ITestCaseProvider</b> will be used.
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| 59 |
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| 60 | <p><b>HasTestCasesFor</b> should return true if the provider is able to supply test cases
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| 61 | for the specified method. If a provider only wants to be used on certain types
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| 62 | of tests, it can examine the provided MethodInfo and the suite for which the
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| 63 | test is being constructed and return true or false based on what it finds.
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| 64 |
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| 65 | <p>The GetParametersFor method should return a list of individual test cases.
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| 66 | Each test case may be expressed as a ParameterSet, as an array of arguments
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| 67 | or as a custom object containing one or more of the following properties:
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| 68 |
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| 69 | <ul>
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| 70 | <li>Arguments
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| 71 | <li>RunState
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| 72 | <li>NotRunReason
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| 73 | <li>ExpectedExceptionType
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| 74 | <li>ExpectedExceptionName
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| 75 | <li>ExpectedExceptionMessage
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| 76 | <li>Result
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| 77 | <li>Description
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| 78 | <li>TestName
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| 79 | </ul>
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| 80 |
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| 81 | <p>The ParameterSet class provides all these properties and may be used
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| 82 | to avoid the overhead of reflecting on the properties.
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| 83 |
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| 84 | <h4>Notes:</h4>
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| 85 |
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| 86 | <ol>
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| 87 | <li>Most providers will delegate one of the interface implementations
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| 88 | to the other if they implement both.
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| 89 | <li>TestCaseProviders that use data from the fixture class should use
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| 90 | <b>ITestCaseProvider2</b> interface so that they are able to access any
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| 91 | arguments supplied for constructing the fixture object.
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| 92 | <li>Providers that acquire data from outside the fixture will usually
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| 93 | be able to work with <b>ITestCaseProvider</b> alone.
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| 94 | <li>The <b>ITestCaseProvider2</b> interface was added in the NUnit 2.5.1 release.
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| 95 | </ol>
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