How to mock ActionExecutingContext with Moq?

Question

I am trying to test the following filter:

using Microsoft.AspNet.Mvc;
using Microsoft.AspNet.Mvc.Filters;

namespace Hello
{
    public class ValidationFilte         


        

Answer 1

If someone was wondering how to do this when you inherit from IAsyncActionFilter

[Fact]
public async Task MyTest()
{
    var modelState = new ModelStateDictionary();

    var httpContextMock = new DefaultHttpContext();

    httpContextMock.Request.Query = new QueryCollection(new Dictionary<string, StringValues> {}); // if you are reading any properties from the query parameters

    var actionContext = new ActionContext(
        httpContextMock,
        Mock.Of<RouteData>(),
        Mock.Of<ActionDescriptor>(),
        modelState
    );

    var actionExecutingContext = new ActionExecutingContext(
        actionContext,
        new List<IFilterMetadata>(),
        new Dictionary<string, object>(),
        Mock.Of<Controller>()
    )
    {
        Result = new OkResult() // It will return ok unless during code execution you change this when by condition
    };

    Mymock1.SetupGet(x => x.SomeProperty).Returns("MySomething");
    Mymock2.Setup(x => x.GetSomething(It.IsAny<string>(), It.IsAny<string>())).ReturnsAsync(true);

    var context = new ActionExecutedContext(actionContext, new List<IFilterMetadata>(), Mock.Of<Controller>());

    await _classUnderTest.OnActionExecutionAsync(actionExecutingContext, async () => { return context; });

    actionExecutingContext.Result.Should().BeOfType<OkResult>();
}

Answer 2

I just stumbled on the same problem and solved it in this way.

[Fact]
public void ValidateModelAttributes_SetsResultToBadRequest_IfModelIsInvalid()
{
    var validationFilter = new ValidationFilter();
    var modelState = new ModelStateDictionary();
    modelState.AddModelError("name", "invalid");

    var actionContext = new ActionContext(
        Mock.Of<HttpContext>(),
        Mock.Of<RouteData>(),
        Mock.Of<ActionDescriptor>(),
        modelState
    );

    var actionExecutingContext = new ActionExecutingContext(
        actionContext,
        new List<IFilterMetadata>(),
        new Dictionary<string, object>(),
        Mock.Of<Controller>()
    );

    validationFilter.OnActionExecuting(actionExecutingContext);

    Assert.IsType<BadRequestObjectResult>(actionExecutingContext.Result);
}