NUnit - TestcaseBuilders

### TestCaseBuilders (NUnit 2.4)

#### Purpose

TestCaseBuilders create Tests based on a MethodInfo. NUnit uses several TestCaseBuilders internally to create various kinds of TestMethods.

#### Extension Point

Addins use the host to access this extension point by name:

    	IExtensionPoint testCaseBuilders = host.GetExtensionPoint( "TestCaseBuilders" );

#### Interfaces

The extension object passed to Install must implement either the ITestCaseBuilder or the ITestCaseBuilder2 interface:

    	public interface ITestCaseBuilder
    	{
    		bool CanBuildFrom( MethodInfo method );
    		Test BuildFrom( MethodInfo method );
    	}

    	public interface ITestCaseBuilder2 : ITestCaseBuilder
    	{
    		bool CanBuildFrom( MethodInfo method, Test suite );
    		Test BuildFrom( MethodInfo method, Test suite );
    	}

NUnit will call ITestCaseBuilder2 if it is available. Otherwise ITestCaseBuilder will be used.

The CanBuildFrom method should return true if the addin can build a test from the MethodInfo provided. Some TestCaseBuilder addins are only intended to apply to methods within a specific type of fixture. The suite argument of the ITestCaseBuilder2 interface may be used to make this determination.

The BuildFrom method should return a test constructed over the MethodInfo provided as an argument or null if the method cannot be used.