Helper class for testing WebApi action filters

ContextUtil.cs

internal static class ContextUtil
{
  public static HttpControllerContext CreateControllerContext(HttpConfiguration configuration = null, IHttpController instance = null, IHttpRouteData routeData = null, HttpRequestMessage request = null)
  {
      HttpConfiguration config = configuration ?? new HttpConfiguration();
      IHttpRouteData route = routeData ?? new HttpRouteData(new HttpRoute());
      HttpRequestMessage req = request ?? new HttpRequestMessage();
      req.SetConfiguration(config);
      req.SetRouteData(route);
  
      HttpControllerContext context = new HttpControllerContext(config, route, req);
      if (instance != null)
      {
          context.Controller = instance;
      }
      context.ControllerDescriptor = CreateControllerDescriptor(config);
  
      return context;
  }
  
  public static HttpActionContext CreateActionContext(HttpControllerContext controllerContext = null, HttpActionDescriptor actionDescriptor = null)
  {
      HttpControllerContext context = controllerContext ?? ContextUtil.CreateControllerContext();
      HttpActionDescriptor descriptor = actionDescriptor ?? CreateActionDescriptor();
      descriptor.ControllerDescriptor = context.ControllerDescriptor;
      return new HttpActionContext(context, descriptor);
  }
  
  public static HttpActionContext GetHttpActionContext(HttpRequestMessage request)
  {
      HttpActionContext actionContext = CreateActionContext();
      actionContext.ControllerContext.Request = request;
      return actionContext;
  }
  
  public static HttpActionExecutedContext GetActionExecutedContext(HttpRequestMessage request, HttpResponseMessage response)
  {
      HttpActionContext actionContext = CreateActionContext();
      actionContext.ControllerContext.Request = request;
      HttpActionExecutedContext actionExecutedContext = new HttpActionExecutedContext(actionContext, null) { Response = response };
      return actionExecutedContext;
  }
  
  public static HttpControllerDescriptor CreateControllerDescriptor(HttpConfiguration config = null)
  {
      if (config == null)
      {
          config = new HttpConfiguration();
      }
      return new HttpControllerDescriptor() { Configuration = config, ControllerName = "FooController" };
  }
  
  public static HttpActionDescriptor CreateActionDescriptor()
  {
      var mock = new Mock<HttpActionDescriptor>() { CallBase = true };
      mock.SetupGet(d => d.ActionName).Returns("Bar");
      return mock.Object;
  }
}