125 lines
4.1 KiB
HTML
125 lines
4.1 KiB
HTML
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<h3>DataPointProviders (NUnit 2.5)</h3>
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<h4>Purpose</h4>
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<p>DataPointProviders are used to supply data for an individual parameter
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of a parameterized test method.
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<h4>Extension Point</h4>
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<p>Addins use the host to access this extension point by name:
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<pre>
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IExtensionPoint listeners = host.GetExtensionPoint( "DataPointProviders" );</pre>
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<h4>Interface</h4>
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<p>The extension object passed to Install must implement either the
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<b>IDataPointProvider</b> or the <b>IDataPointProvider2</b> interface:
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<pre>
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public interface IDataPointProvider
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{
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bool HasDataFor( ParameterInfo parameter );
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IEnumerable GetDataFor( ParameterInfo parameter );
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}
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public interface IDataPointProvider2 : IDatapointProvider
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{
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bool HasDataFor( ParameterInfo parameter, Test parentSuite );
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IEnumerable GetDataFor( ParameterInfo parameter, Test parentSuite );
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}
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</pre>
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<p>NUnit will call <b>IDataPointProvider2</b> if it is available. Otherwise
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<b>IDataPointProvider</b> will be used.
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<p>The <b>HasDataFor</b> method should return true if the provider is able to
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supply data for the specified parameter. If a provider only wants to be used
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on certain types of tests, it can examine the supplied ParameterInfo and
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its associated MethodInfo and Type and/or the parent test suite.
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<p>The <b>GetDataFor</b> method should return a list of individual values to
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use for the supplied parameter in running the test.
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<h4>Notes:</h4>
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<ol>
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<li>Most providers will delegate one of the interface implementations
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to the other if they implement both.
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<li>DataPointProviders that use data from the fixture class should use
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<b>IDataPointProvider2</b> interface so that they are able to access any
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arguments supplied for constructing the fixture object.
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<li>Providers that acquire data from outside the fixture will usually
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be able to work with <b>IDataPointProvider</b> alone.
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<li>The <b>IDataPointProvider2</b> interface was added in the NUnit 2.5.1 release.
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