CustomConvention.cs

public class CustomConvention : Convention
{
    public CustomConvention()
    {
        Classes
            .NameEndsWith("Tests");

        Methods
            .Where(method => method.IsVoid());

        ClassExecution
            .CreateInstancePerTestClass();


        //This new hook lets you explain where
        //parameters should come from:

        Parameters(FromInputAttributes);
    }
    
    IEnumerable<object[]> FromInputAttributes(MethodInfo method)
    {
        var inputAttributes = method.GetCustomAttributes<InputAttribute>(true).ToArray();

        if (!inputAttributes.Any())
        {
            //No [Input] attributes?  Just call the
            //test method once with no arguments.

            yield return new object[] { };
        }
        else
        {
            //Call the test once for each [Input] attribute.

            foreach (var input in inputAttributes)
                yield return input.Parameters;
        }
    }
}