Step3_FindModels.cs

// Set list of models for next steps
switch (Wizard.TestingMode) {
    case TestingMode.Run:
        Wizard.Models = newModels.Keys.ToDictionary(
            m => m,
            x => dummyArray);
        break;

    case TestingMode.RunAndCompare:
        Wizard.Models = newModels.Keys.ToDictionary(
            m => m,
            m => (oldTestSet.ContainsModel(m)
                ? oldTestSet[m].Intersect(newTestSet[m]).ToArray()
                : dummyArray));
        break;

    case TestingMode.ViewPreviousResults:
        // Right now all models are included, even if
        // they don't have any associated comparison results.
        Wizard.Models = oldModels.Keys.ToDictionary(
            m => m,
            m => oldTestSet[m].Where(
                o => oldTestSet.OutputFileHasResults(o)).ToArray());
        break;

    case TestingMode.Compare:
        Wizard.Models = oldModels.Keys
            .Intersect(newModels.Keys).ToDictionary(
                m => m,
                m => oldTestSet[m].Intersect(newTestSet[m]).ToArray())
            .Where(entry => entry.Value.Length > 0)
            .ToDictionary(
                entry => entry.Key,
                entry => entry.Value);
        break;
}