I have the following Unit Test:
[Fact]
public void FetchStudents_Rendered_Test()
{
var testData = new List<Student>()
{
new Student()
{
Id = 1,
Name = "Sample Name",
Email = "sample#email.com",
Phone = "123456789",
Address = "Sample address"
}
};
var mockDbSet = Mock.Of<DbSet<Student>>(dbSet => dbSet.AsQueryable() == testData.AsQueryable());
DbContextOptions<ApplicationDbContext> options = new DbContextOptionsBuilder<ApplicationDbContext>()
.UseInMemoryDatabase(databaseName: "StudentsTest")
.Options;
var mockDbContext = new Mock<ApplicationDbContext>(options);
using var ctx = new TestContext();
ctx.Services.AddSingleton<IStudentsService>(new StudentsService(mockDbContext.Object));
// RenderComponent will inject the service in the WeatherForecasts component
// when it is instantiated and rendered.
var cut = ctx.RenderComponent<FetchStudents>();
// Assert that service is injected
Assert.NotNull(cut.Instance.students);
}
The StudentService looks like below:
public class StudentsService : IStudentsService
{
private readonly ApplicationDbContext _db;
public StudentsService(ApplicationDbContext db)
{
_db = db;
}
public async Task<List<Student>> GetStudentsAsync()
{
return await _db.Students.ToListAsync();
}
}
When I run the unit test I get the following error:
System.InvalidOperationException: 'The source 'IQueryable' doesn't implement 'IAsyncEnumerable<BlazorStudentApp.Data.Models.Student>'. Only sources that implement 'IAsyncEnumerable' can be used for Entity Framework asynchronous operations.'
I have tried setting up the DbSet in multiple different ways, but I keep getting the same error.
What am I missing here?
I have an ASP.NET MVC Core application that I am writing unit tests for. One of the action methods uses User name for some functionality:
SettingsViewModel svm = _context.MySettings(User.Identity.Name);
which obviously fails in the unit test. I looked around and all suggestions are from .NET 4.5 to mock HttpContext. I am sure there is a better way to do that. I tried to inject IPrincipal, but it threw an error; and I even tried this (out of desperation, I suppose):
public IActionResult Index(IPrincipal principal = null) {
IPrincipal user = principal ?? User;
SettingsViewModel svm = _context.MySettings(user.Identity.Name);
return View(svm);
}
but this threw an error as well.
Couldn't find anything in the docs either...
The controller’s User is accessed through the HttpContext of the controller. The latter is stored within the ControllerContext.
The easiest way to set the user is by assigning a different HttpContext with a constructed user. We can use DefaultHttpContext for this purpose, that way we don’t have to mock everything. Then we just use that HttpContext within a controller context and pass that to the controller instance:
var user = new ClaimsPrincipal(new ClaimsIdentity(new Claim[]
{
new Claim(ClaimTypes.Name, "example name"),
new Claim(ClaimTypes.NameIdentifier, "1"),
new Claim("custom-claim", "example claim value"),
}, "mock"));
var controller = new SomeController(dependencies…);
controller.ControllerContext = new ControllerContext()
{
HttpContext = new DefaultHttpContext() { User = user }
};
When creating your own ClaimsIdentity, make sure to pass an explicit authenticationType to the constructor. This makes sure that IsAuthenticated will work correctly (in case you use that in your code to determine whether a user is authenticated).
In previous versions you could have set User directly on the controller, which made for some very easy unit tests.
If you look at the source code for ControllerBase you will notice that the User is extracted from HttpContext.
/// <summary>
/// Gets the <see cref="ClaimsPrincipal"/> for user associated with the executing action.
/// </summary>
public ClaimsPrincipal User => HttpContext?.User;
and the controller accesses the HttpContext via ControllerContext
/// <summary>
/// Gets the <see cref="Http.HttpContext"/> for the executing action.
/// </summary>
public HttpContext HttpContext => ControllerContext.HttpContext;
You will notice that these two are read only properties. The good news is that ControllerContext property allows for setting it's value so that will be your way in.
So the target is to get at that object. In Core HttpContext is abstract so it is a lot easier to mock.
Assuming a controller like
public class MyController : Controller {
IMyContext _context;
public MyController(IMyContext context) {
_context = context;
}
public IActionResult Index() {
SettingsViewModel svm = _context.MySettings(User.Identity.Name);
return View(svm);
}
//...other code removed for brevity
}
Using Moq, a test could look like this
public void Given_User_Index_Should_Return_ViewResult_With_Model() {
//Arrange
var username = "FakeUserName";
var identity = new GenericIdentity(username, "");
var mockPrincipal = new Mock<ClaimsPrincipal>();
mockPrincipal.Setup(x => x.Identity).Returns(identity);
mockPrincipal.Setup(x => x.IsInRole(It.IsAny<string>())).Returns(true);
var mockHttpContext = new Mock<HttpContext>();
mockHttpContext.Setup(m => m.User).Returns(mockPrincipal.Object);
var model = new SettingsViewModel() {
//...other code removed for brevity
};
var mockContext = new Mock<IMyContext>();
mockContext.Setup(m => m.MySettings(username)).Returns(model);
var controller = new MyController(mockContext.Object) {
ControllerContext = new ControllerContext {
HttpContext = mockHttpContext.Object
}
};
//Act
var viewResult = controller.Index() as ViewResult;
//Assert
Assert.IsNotNull(viewResult);
Assert.IsNotNull(viewResult.Model);
Assert.AreEqual(model, viewResult.Model);
}
There is also the possibility to use the existing classes, and mock only when needed.
var user = new Mock<ClaimsPrincipal>();
_controller.ControllerContext = new ControllerContext
{
HttpContext = new DefaultHttpContext
{
User = user.Object
}
};
In my case, I needed to make use of Request.HttpContext.User.Identity.IsAuthenticated, Request.HttpContext.User.Identity.Name and some business logic sitting outside of the controller. I was able to use a combination of Nkosi's, Calin's and Poke's answer for this:
var identity = new Mock<IIdentity>();
identity.SetupGet(i => i.IsAuthenticated).Returns(true);
identity.SetupGet(i => i.Name).Returns("FakeUserName");
var mockPrincipal = new Mock<ClaimsPrincipal>();
mockPrincipal.Setup(x => x.Identity).Returns(identity.Object);
var mockAuthHandler = new Mock<ICustomAuthorizationHandler>();
mockAuthHandler.Setup(x => x.CustomAuth(It.IsAny<ClaimsPrincipal>(), ...)).Returns(true).Verifiable();
var controller = new MyController(...);
var mockHttpContext = new Mock<HttpContext>();
mockHttpContext.Setup(m => m.User).Returns(mockPrincipal.Object);
controller.ControllerContext = new ControllerContext();
controller.ControllerContext.HttpContext = new DefaultHttpContext()
{
User = mockPrincipal.Object
};
var result = controller.Get() as OkObjectResult;
//Assert results
mockAuthHandler.Verify();
I want to hit my Controllers directly and just use DI like AutoFac. To do this I first registering ContextController.
var identity = new GenericIdentity("Test User");
var httpContext = new DefaultHttpContext()
{
User = new GenericPrincipal(identity, null)
};
var context = new ControllerContext { HttpContext = httpContext};
builder.RegisterInstance(context);
Next I enable property injection when I register the Controllers.
builder.RegisterAssemblyTypes(assembly)
.Where(t => t.Name.EndsWith("Controller")).PropertiesAutowired();
Then User.Identity.Name is populated, and I do not need to do anything special when calling a method on my Controller.
public async Task<ActionResult<IEnumerable<Employee>>> Get()
{
var requestedBy = User.Identity?.Name;
..................
I would look to implement an Abstract Factory Pattern.
Create an interface for a factory specifically for providing user names.
Then provide concrete classes, one which provides User.Identity.Name, and one that provides some other hard coded value that works for your tests.
You can then use the appropriate concrete class depending on production versus test code. Perhaps looking to pass the factory in as a parameter, or switching to the correct factory based on some configuration value.
interface IUserNameFactory
{
string BuildUserName();
}
class ProductionFactory : IUserNameFactory
{
public BuildUserName() { return User.Identity.Name; }
}
class MockFactory : IUserNameFactory
{
public BuildUserName() { return "James"; }
}
IUserNameFactory factory;
if(inProductionMode)
{
factory = new ProductionFactory();
}
else
{
factory = new MockFactory();
}
SettingsViewModel svm = _context.MySettings(factory.BuildUserName());
I got a brownfield .net 4.8 project that I needed to convert to .net 5.0 and I wanted to keep as much of the original code as possible, including the unit-/integration tests. The test for Controllers relied on the Context a lot so I created this Extension method to enable setting tokens, claims and headers:
public static void AddContextMock(
this ControllerBase controller,
IEnumerable<(string key, string value)> claims = null,
IEnumerable<(string key, string value)> tokens = null,
IEnumerable<(string key, string value)> headers = null)
{
HttpContext mockContext = new DefaultHttpContext();
if(claims != null)
{
mockContext.User = SetupClaims(claims);
}
if(tokens != null)
{
mockContext.RequestServices = SetupTokens(tokens);
}
if(headers != null)
{
SetupHeaders(mockContext, headers);
}
controller.ControllerContext = new ControllerContext()
{
HttpContext = mockContext
};
}
private static void SetupHeaders(HttpContext mockContext, IEnumerable<(string key, string value)> headers)
{
foreach(var header in headers)
{
mockContext.Request.Headers.Add(header.key, header.value);
}
}
private static ClaimsPrincipal SetupClaims(IEnumerable<(string key, string value)> claimValues)
{
var claims = claimValues.Select(c => new Claim(c.key, c.value));
return new ClaimsPrincipal(new ClaimsIdentity(claims, "mock"));
}
private static IServiceProvider SetupTokens(IEnumerable<(string key, string value)> tokenValues)
{
var mockServiceProvider = new Mock<IServiceProvider>();
var authenticationServiceMock = new Mock<IAuthenticationService>();
var authResult = AuthenticateResult.Success(
new AuthenticationTicket(new ClaimsPrincipal(), null));
var tokens = tokenValues.Select(t => new AuthenticationToken { Name = t.key, Value = t.value });
authResult.Properties.StoreTokens(tokens);
authenticationServiceMock
.Setup(x => x.AuthenticateAsync(It.IsAny<HttpContext>(), null))
.ReturnsAsync(authResult);
mockServiceProvider.Setup(_ => _.GetService(typeof(IAuthenticationService))).Returns(authenticationServiceMock.Object);
return mockServiceProvider.Object;
}
This uses Moq but can be adapted to other mocking frameworks. The authentication type is hardcoded to "mock" since I rely on default authentication but this could be supplied as well.
It is used as such:
_controllerUnderTest.AddContextMock(
claims: new[]
{
(ClaimTypes.Name, "UserName"),
(ClaimTypes.MobilePhone, "1234"),
},
tokens: new[]
{
("access_token", "accessTokenValue")
},
headers: new[]
{
("header", "headerValue")
});
If you're using Razor pages and want to override the claims:
[SetUp]
public void Setup()
{
var user = new ClaimsPrincipal(new ClaimsIdentity(
new Claim[] {
new("dateofbirth", "2000-10-10"),
new("surname", "Smith") },
"mock"));
_razorModel = new RazorModel()
{
PageContext = new PageContext
{
HttpContext = new DefaultHttpContext() { User = user }
}
};
}
In Asp.net MVC 4.5 , using Microsoft.VisualStudio.TestTools.UnitTesting.
is there a way to really unit test an ActionResult? All documentation I have seen only tests the view name!
Assert.AreEqual("Action Method", result.ViewName);
Well, I want to have a really test. How can I test the response of the controller-action ?
Given something basic along the lines of:
public ActionResult Display(string productCode)
{
var model = new ProductModel(productCode);
if (model.NotFound)
{
return this.RedirectToRoute("NotFound");
}
return this.View("Product", model);
}
Instead of something that asserts like Assert.AreEqual("Action Method", result.ViewName); (which can be a valid test.
You have many options including...
Looking at the model type
[TestMethod]
public void Display_WhenPassedValidProductCode_CreatesModel()
{
using (var controller = this.CreateController())
{
// Arrange Mocks on controller, e.g. a Service or Repository
// Act
var result = controller.Display(string.Empty) as ViewResult;
var model = (ProductModel)result.Model;
Assert.IsInstanceOfType(model, typeof(ProductModel));
}
}
Looking at the model population process
[TestMethod]
public void Display_WhenPassedValidProductCode_PopulatesModel()
{
using (var controller = this.CreateController())
{
const string ProductCode = "123465";
// Arrange Mocks on controller, e.g. a Service or Repository
// Act
var result = controller.Display(ProductCode) as ViewResult;
var model = (ProductModel)result.Model;
Assert.AreEqual(ProductCode, model.ProductCode);
}
}
Looking at the type of action result
[TestMethod]
public void Display_WhenNotFound_Redirects()
{
using (var controller = this.CreateController())
{
const string ProductCode = "789000";
// Arrange Mocks on controller, e.g. a Service or Repository
// Act
var result = controller.Display(ProductCode) as RedirectToRouteResult;
Assert.IsNotNull(result); // An "as" cast will be null if the type does not match
}
}
Basically you can test pretty much anything, pick an example on your code base and try and test it. If you get stuck construct a decent question and post it here.
I am trying to unit test the redirection of my controller in MVC 4 .Net 4.5. Here is an example:
[TestMethod]
public void Register_PassValidModel_RedirectToHomeIndexShouldBeTrue()
{
//Arrange
var registerModel = new RegisterModel
{
Email = "validEmailAddress#domain.com",
Password = "password"
};
//Assign
var result = _controller.Register(registerModel) as RedirectToRouteResult;
//Assert
result.RouteValues["Action"].ShouldBeEqual("Index");
result.RouteValues["Controller"].ShouldBeEqual("Home");
}
Here is the controller:
[HttpPost]
public ActionResult Register(RegisterModel model)
{
if (ModelState.IsValid)
{
var userToRegister = new User { Email = model.Email, Password = model.Password };
var service = new UserService(_userRepository);
User user = service.RegisterUser(userToRegister);
if (user.UserErrorMessages.Count != 0)
{
user.UserErrorMessages.ForEach(x => ModelState.AddModelError("", x));
return View(model);
}
SetCookie(model.Email);
return RedirectToAction("Index", "Home");
}
return View(model);
}
The issue the variable result in the Unit Test is null. I found this code from someone who was working on a MVC 2 project and it seemed to work for him. Has something changed with MVC 4?
Thanks in advance!
Try this one hope it will useful for you
var result= (RedirectToRouteResult)controller.Register(registrModel);
result.RouteValues["action"].Equals("Index");
result.RouteValues["controller"].Equals("Home");
Assert.AreEqual("Index", action.RouteValues["action"]);
Assert.AreEqual("Home", action.RouteValues["controller"]);
All,
I'm developing and unit testing an interactive voice application using ASP.NET MVC 3 whose controllers return Views containing VoiceXML. I'd like to create unit tests that capture the actual VoiceXML output so I can schema-validate it.
My reading and testing have taken me to Scott H's FakeHttpContext that uses Moq, as well as several responses here. Everything compiles correctly, and I'm trying to do something like the following:
[TestMethod]
public void WelcomeTest1()
{
EmergencyController controller = new EmergencyController();
controller.ControllerContext = new ControllerContext(MvcMockHelpers.FakeHttpContext("~/Emergency/Welcome"), new RouteData(), controller);
ViewResult result = (controller.Welcome()) as ViewResult;
.
.
Assert.IsTrue(controller.ControllerContext.HttpContext.Response.OutputStream.Length > 0);
// assert schema validation on the output here
}
However, stepping through this, I can see that the Welcome view being called, but I'm looking for something in the Response.Output and not finding anything. The mock is set up as follows, in hope that setting CallBase to true would actually write something out. I found some code that I added to the FakeHttpContext constructor that supposedly invokes a StringWriter, but to no avail:
public static HttpContextBase FakeHttpContext()
{
var context = new Mock<HttpContextBase>();
var request = new Mock<HttpRequestBase>() { CallBase = true };
var response = new Mock<HttpResponseBase>();
var session = new Mock<HttpSessionStateBase>();
var server = new Mock<HttpServerUtilityBase>();
context.Setup(ctx => ctx.Request).Returns(request.Object);
context.Setup(ctx => ctx.Response).Returns(response.Object);
context.Setup(ctx => ctx.Session).Returns(session.Object);
context.Setup(ctx => ctx.Server).Returns(server.Object);
response.Setup(r => r.OutputStream).Returns(new MemoryStream());
response.Setup(r => r.Headers).Returns(new NameValueCollection());
var writer = new StringWriter();
var wr = new SimpleWorkerRequest("", "", "", "", writer);
HttpContext.Current = new HttpContext(wr);
return context.Object;
}
I'm sure I'm missing something obvious, but I'm stumped right now.
Thanks
Jim Stanley
Blackboard Connect
The result doesn't get populated in the ViewResult. In other words, the view isn't rendered by you calling return View() in your controller, rather mvc takes the viewresult and renders it at a later time in the request-sycle. What you need to do is to create a render-function for ViewResults, like this one:
using System;
using System.IO;
using System.Web.Mvc;
namespace CoPrice.Helpers
{
public static class ViewRendrer
{
public static string ToHtml(this ViewResult result, Controller controller)
{
controller.ViewData.Model = result.Model;
try
{
using (StringWriter sw = new StringWriter())
{
ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(controller.ControllerContext, result.ViewName);
ViewContext context = new ViewContext(controller.ControllerContext, viewResult.View, result.ViewData, result.TempData, sw);
viewResult.View.Render(context, sw);
return sw.GetStringBuilder().ToString();
}
}
catch (Exception e)
{
return e.ToString();
}
}
}
}
Then you can do result.ToHtml(controller) to get the actual data (this works for RazorViews only I think, though I'm not sure, that's what I've used it for at least).