Currently working on a validation and testing of a yield curve model (one factor short rate model). Have been reading Andersen and Piterbarg, and Mercurio and Brigo. Good for true understanding, but bad in terms of practicality. Veronesi is a bit more practical and doesnt go too much in the details, yet enough. Same with Hull but less focus on fixed income, more on equity. Any ideas of where can I read about actual practical testing of models?