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Why ?

The system under development is a bridge between your Fixtures and the system your testing.
If you want to change the way GreenPepper is finding/instanciating your fixtures, or if you need to hook the document execution then you can define a Custom System Under Development.

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Your class does not have to provides both of them.

Rules of conversion 

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Info
Before version 4.0.1, the order was the oposite.

From example to fixture

1. First GreenPepper  will look for a registered TypeConverter that can handles the type.
2. Second GreenPepper will verify if the type is can self convert (ie public static T parse(String) or public static T ValueOf(string))
3. An UnsupportedOperationException will be thrown

From fixture return value to String

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1. First GreenPepper  will look for a registered TypeConverter that can handles the type. 
2. Second GreenPepper will verify if the type is can self revert (ie public static String toString(T) or public static T ToString(string))

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1. Use the toString() or ToString() method on the data itself.

Changing how GreenPepper is finding your Fixtures

public static class CustomSystemUnderDevelopment extends DefaultSystemUnderDevelopment  {
        public CustomSystemUnderDevelopment( String... params )
        {
           super.addImport("com.mycompany.fixtures");
           super.addImport("com.mycompany.specials.fixtures");
        }
}

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