如何在ASP.NET MVC中使用Moq模拟HttpPostedFileBase

Question

My controller method:

[HttpPost]
public ActionResult CreateTeam(Team model, HttpPostedFileBase upload)
{
     if (ModelState.IsValid)
     {
          if (upload != null)
          {
              // Get the file
              string fileName = System.IO.Path.GetFileName(upload.FileName);
              // Save the file in file сохраняем файл в папку Files в проекте
              upload.SaveAs(Server.MapPath("~/Images/NBAlogoImg/" + fileName));
          }
         teamRepository.CreatTeam(model);

         return RedirectToAction("Index", "Player");
    }

    return View(model);
}

My unit test method without upload image:

[TestMethod]
public void CanCreateTeam()
{
        //Arrange
        Mock<ITeamRepository> teamsMock = new Mock<ITeamRepository>();
        Team newTeam = new Team()
        {
            Id = 0,
            Name = "Chicago Bulls",
            Path = "CHI.jpg",
        };
        TeamController controller = new TeamController(teamsMock.Object);
        //Action
        ActionResult result = controller.CreateTeam(newTeam);
        teamsMock.Verify(m => m.CreatTeam(newTeam));
        //Assert
        Assert.IsInstanceOfType(result, typeof(RedirectToRouteResult));
}

I don't have idea how make the right unit test for this action. However the action are working right without any problem.

How in this test method add the functional for test of HttpPostedFileBase which upload the image?

Answer 1

First update your CreateTeam POST method as follows because there is a problem in upload.SaveAs(Server.MapPath("~/Images/NBAlogoImg/" + fileName)); line.

[HttpPost]
public ActionResult CreateTeam(Team model, HttpPostedFileBase upload)
{
     if (ModelState.IsValid)
     {
          if (upload != null)
          {
              // Get the file
              string fileName = System.IO.Path.GetFileName(upload.FileName);
              var fileUploadPath = Path.Combine(Server.MapPath("~/Images/NBAlogoImg/"),fileName);
              upload.SaveAs(fileUploadPath);
          }
         teamRepository.CreatTeam(model);

         return RedirectToAction("Index", "Player");
    }

    return View(model);
}

Then write your test method as follows:

[TestMethod]
public void CanCreateTeam()
{
    //Arrange
    Mock<ITeamRepository> teamRepositoryMock = new Mock<ITeamRepository>();
    Team newTeam = new Team()
    {
        Id = 0,
        Name = "Chicago Bulls",
        Path = "CHI.jpg",
    };


    var httpContextMock = new Mock<HttpContextBase>();
    var serverMock = new Mock<HttpServerUtilityBase>();
    serverMock.Setup(x => x.MapPath("~/Images/NBAlogoImg/")).Returns(@"c:\work\app_data");
    httpContextMock.Setup(x => x.Server).Returns(serverMock.Object);

    var fileMock = new Mock<HttpPostedFileBase>();
    fileMock.Setup(x => x.FileName).Returns("file1.pdf");

    TeamController controller = new TeamController(teamRepositoryMock.Object);
    controller.ControllerContext = new ControllerContext(httpContextMock.Object, new RouteData(), controller);

    //Act
    ActionResult result = controller.CreateTeam(newTeam , fileMock.Object);

    //Assert
    fileMock.Verify(x => x.SaveAs(@"c:\work\app_data\file1.pdf"));
    Assert.IsInstanceOfType(result, typeof(RedirectToRouteResult));
}

I have checked the above code in a test project and it works perfectly.