MockData.as

// someResponse.amf3 is a data file saved from Charles, ServiceCapture, etc.
// embedded in a class for easy access

[Embed( source="data/someResponse.amf3", mimeType="application/octet-stream" )]
public static const savedCallResponse:Class;

MockDelegate.as

// MockDelegateHelper is a class provided by Swiz

[Inject]
public var mdh:MockDelegateHelper;

// methods in mock delegate can pull saved data and use Swiz's AMFUtil to parse it
public function fetchDistrictsAndSchools():AsyncToken
{
	return mdh.createMockResult( AMFUtil.getAMF3Data( MockData.savedCallResponse ) );
}