为server.mappath添加依赖注入

Question

我是单元测试的新手，并尝试为服务器添加依赖注入。MapPath，这是我目前得到的。

IPathMapper

public interface IPathMapper
{
string MapPath(string relativePath);
}

ServerPathMapper

public class ServerPathMapper : IPathMapper
{
public string MapPath(string relativePath)
{
return HttpContext.Current.Server.MapPath(relativePath);
}
}

DummyPathMapper

public class DummyPathMapper : IPathMapper
{
public string MapPath(string relativePath)
{
return "C:/temp/" + relativePath;
}
}

[Fact]
public void Add_InvoiceViewModel_ToUploadActionResult()
{
// Arrange
var serverPathMapper = new DummyPathMapper();
var myController = new InvoiceController();
var mockClaim = new Claim("Administrator", "test");
var identity = Substitute.For<ClaimsIdentity>();
identity.Name.Returns("test name");
identity.IsAuthenticated.Returns(true);
identity.FindFirst(Arg.Any<string>()).Returns(mockClaim);
var claimsPrincipal = Substitute.For<ClaimsPrincipal>();
claimsPrincipal.HasClaim(Arg.Any<string>(), Arg.Any<string>()).Returns(true);
claimsPrincipal.HasClaim(Arg.Any<Predicate<Claim>>()).Returns(true);
claimsPrincipal.Identity.Returns(identity);
var httpContext = Substitute.For<HttpContextBase>();
httpContext.User.Returns(claimsPrincipal);

var controllerContext = new ControllerContext(
httpContext, new System.Web.Routing.RouteData(), myController);
myController.ControllerContext = controllerContext;
myController._pathMapper = new DummyPathMapper();

var model = new InvoiceViewModel
{
InvoiceInfoNotice = "",
InvoiceList = new List<Bill>()
};
var constructorInfo = typeof(HttpPostedFile).GetConstructors(BindingFlags.NonPublic | BindingFlags.Instance)[0];
var obj = (HttpPostedFile)constructorInfo
.Invoke(new object[] { @"D:file.xlsx", "application/vnd.ms-excel", null });
model.MembershipRegisterFile = new HttpPostedFileWrapper(obj);

// Act
var actionResult = myController.Upload(model, "");
// Assert
actionResult.Should().NotBeNull();
}

我在哪里以及如何添加DummyPathMapper在安排?

更新:我添加了这个，这是正确的方式吗?

控制器

public IPathMapper _pathMapper;
public InvoiceController()
{
_pathMapper = new ServerPathMapper();
}

Answer 1

IPathMapper应该通过构造函数注入作为显式依赖注入到控制器中。

//...
private readonly IPathMapper pathMapper;
//ctor
public InvoiceController(IPathMapper pathMapper) {
this.pathMapper = pathMapper;
}
//...

假设您的应用程序中使用了DI并且配置正确，那么ServerPathMapper将在运行时被注入。

这将允许测试被相应地安排

//...
// Arrange
var serverPathMapper = new DummyPathMapper();
var myController = new InvoiceController(serverPathMapper);
//...