Sample code for unit testing api controllers

Question

Is there an sample code that shows unit testing a controller that inherits from the api controller? I am trying to unit test a POST but it is failing. I believe I need to set up

Answer 1

Sample code for unit testing API controller with async fundtion in C#

1. Prepare test Models:

           using System;
           namespace TestAPI.Models
           {
               public class TestResult
               {
                   public DateTime Date { get; set; }
                   public bool Success { get; set; }
                   public string Message { get; set; }
               }      
           }
   

2. Prepare test controller

           using TestAPI.Models;
           using System;
           using System.Net;
           using System.Threading.Tasks;
           using System.Web.Http;
           using System.Web.Http.Description;
   
           namespace TestAPI.Controllers
           {   
               public class TestController : ApiController
               {       
                   public TestController()
                   {           
                   }
   
                   [HttpPost]
                   [ResponseType(typeof(TestResult))]
                   [Route("api/test/start")]
                   public async Task StartTest()
                   {                                
                       DateTime startTime = DateTime.Now;
                       var testProcessor = new TestAsync();
                       await testProcessor.StartTestAsync();                                     
   
                       HttpStatusCode statusCode = HttpStatusCode.OK;
                       return Content(statusCode, new TestResult
                       {
                           Date = DateTime.Now,
                           Success = true,
                           Message = "test"
                       }); 
                   }       
   
               }
           }
   

3. unit test async controller with result check from response

           using Microsoft.VisualStudio.TestTools.UnitTesting;
           using TestAPI.Controllers;
           using TestAPI.Models;
           using System.Web.Http;
           using System.Threading.Tasks;
           using System.Net;
           using System.Web.Script.Serialization;
   
           namespace Unit.Tests.Controllers
           {
               /// 
   
               /// Summary description for ControllerTest
               /// 
               [TestClass]
               public class ControllerTest
               {
                   private TestController _testController;       
                   [TestInitialize]
                   public void estAPI_Initializer()
                   {
                       _testController = new TestController();
                       var configuration = new HttpConfiguration();
                       System.Net.Http.HttpRequestMessage request = new System.Net.Http.HttpRequestMessage();
                       request.Headers.Add("Authorization", "Bearer 1232141241");
                       request.Headers.Add("ContentType", "application/json");
                       _testController.Request = request;
                       _testController.Configuration = configuration;            
                   }
   
                   [TestCategory("Unit test")]
                   [TestMethod]
                   public async Task API_Async_Controller_Test()
                   {
                       IHttpActionResult asyncResponse = await _testController.StartTest();
                       var cToken = new System.Threading.CancellationToken(true);           
                       var rResult = asyncResponse.ExecuteAsync(cToken);                      
                       Assert.IsNotNull(rResult);
                       Assert.IsNotNull(rResult.Result);
                       Assert.AreEqual(rResult.Result.StatusCode, HttpStatusCode.OK);
                       Assert.IsNotNull(rResult.Result.Content);
                       var rContent = rResult.Result.Content;
   
                       string data = await rContent.ReadAsStringAsync();
                       Assert.IsNotNull(data);
                       JavaScriptSerializer JSserializer = new JavaScriptSerializer();
                       var finalResult = JSserializer.Deserialize(data);
   
                       Assert.IsNotNull(finalResult);
                       Assert.IsTrue(finalResult.Success);
                   }        
               }
           }