xUnit: A test object for IActionResult types, wrapping JsonResult, NoContentResult, ObjectResult etc.

ObjectValueActionResult.cs

using System;
using Microsoft.AspNetCore.Mvc;
using Xunit;

namespace My.Tests.Models
{
    /// <summary>
    /// Defines all subclasses of <see cref="ActionResult"/>
    /// that have status codes and <see cref="object"/> values.
    /// </summary>
    public class ObjectValueActionResult
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="ObjectValueActionResult"/> class.
        /// </summary>
        /// <param name="result">The result.</param>
        /// <remarks>
        /// The majority of <see cref="IActionResult"/> instances like <see cref="OkObjectResult"/> derive
        /// from <see cref="ObjectResult"/>.
        /// </remarks>
        public ObjectValueActionResult(IActionResult result)
        {
            Assert.NotNull(result);

            switch (result)
            {
                case JsonResult j:
                    this.Value = j.Value;
                    this.StatusCode = j.StatusCode;
                    break;
                case NoContentResult n:
                    this.StatusCode = n.StatusCode;
                    break;
                case ObjectResult o:
                    this.Value = o.Value;
                    this.StatusCode = o.StatusCode;
                    break;
                default:
                    throw new NotImplementedException($"The expected {nameof(IAsyncResult)} type is not here.");
            }
        }

        /// <summary>
        /// Gets or sets the value.
        /// </summary>
        /// <value>
        /// The value.
        /// </value>
        public object Value { get; set; }

        /// <summary>Gets or sets the HTTP status code.</summary>
        public int? StatusCode { get; set; }
    }
}

JsonResult and ObjectResult do not derive from each other and controller methods are often designed to return either type using IActionResult or ActionResult; i baffles me why JsonResult and ObjectResult are so unrelated—surely someone at Microsoft (like @DamianEdwards) can explain