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Best strategy for unit testing controller front to back in ASP.NET using DI
private readonly IRepository repository;
private readonly IMappingEngine mappingEngine;
private readonly ILogger logger;

public DossierController(IRepository repository, IMappingEngine mappingEngine, ILogger logger)
{
  this.repository = repository;
  this.mappingEngine = mappingEngine;
  this.logger = logger;
}

[HttpPost]
[ActionName("Dossier")]
[AcceptVerbs(HttpVerbs.Post)]
[AcceptParameter(Name = "button", Value = "save")]
public ActionResult Dossier_Save(string button, DossierModel dossierModel, string returnUrl)
{
  if (!Request.IsAuthenticated)
    return RedirectToAction("Index", "Home");

  if (!ModelState.IsValid) return View(dossierModel);

  Dossier dossier = mappingEngine.Map<DossierModel, Dossier>(dossierModel);
  dossier.DigitaleHandtekeningDatum = new DateTime(2011, 11, 11);

  repository.TransactionBegin();
  repository.Save(dossier);
  repository.TransactionCommit();

  return View();
}