/// <summary>
/// Retrieves a list of arguments which can be passed to the specified parameter.
/// </summary>
/// <param name="fixtureType">The point of context in the fixture’s inheritance hierarchy.</param>
/// <param name="parameter">The parameter of a parameterized test.</param>
public IEnumerable GetData(Type fixtureType, ParameterInfo parameter)
{
var from = ParamAttributeTypeConversions.Convert(_from, parameter.ParameterType);
var to = ParamAttributeTypeConversions.Convert(_to, parameter.ParameterType);
var valueGenerator = ValueGenerator.Create(parameter.ParameterType);
ValueGenerator.Step step;
if (!valueGenerator.TryCreateStep(_step, out step))
{
// ValueGenerator.CreateStep has the responsibility to enable Byte values to be incremented
// by the Int32 value -1. Or perhaps in the future, DateTime values to be incremented by a TimeSpan.
// It handles scenarios where the incrementing type is fundamentally different in its most natural form.
// However, ParamAttributeTypeConversions has the responsibility to convert attribute arguments
// that are only of a different type due to IL limitations or NUnit smoothing over overload differences.
// See the XML docs for the ParamAttributeTypeConversions class.
object stepValueToRequire;
if (!ParamAttributeTypeConversions.TryConvert(_step, parameter.ParameterType, out stepValueToRequire))
{
// This will cause CreateStep to throw the same exception as it would throw if TryConvert
// succeeded but the value generator still didn’t recognize the step value.
stepValueToRequire = _step;
}
step = valueGenerator.CreateStep(stepValueToRequire);
}
return(valueGenerator.GenerateRange(from, to, step));
}