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