How can we test C# Asp.Net WebAPI?

Testing WebApi involves sending a request and receiving the response. There are several ways to test the WebApi. Here we will test the WebApi using postman and swagger. Let us create a StudentController like below.

Student Model

namespace DemoWebApplication.Models{
   public class Student{
      public int Id { get; set; }
      public string Name { get; set; }
   }
}

Student Controller

Example

using DemoWebApplication.Models;
using System.Collections.Generic;
using System.Linq;
using System.Web.Http;
namespace DemoWebApplication.Controllers{
   public class StudentController : ApiController{
      List<Student> students = new List<Student>{
         new Student{
            Id = 1,
            Name = "Mark"
         },
         new Student{
            Id = 2,
            Name = "John"
         }
      };
      public IEnumerable<Student> Get(){
         return students;
      }
      public Student Get(int id){
         var studentForId = students.FirstOrDefault(x => x.Id == id);
         return studentForId;
      }
   }
}

Test Using Swagger

Swagger is a specification for documenting REST API. It specifies the format (URL, method, and representation) to describe REST web services. The methods, parameters, and models description are tightly integrated into the server code, thereby maintaining the synchronization in APIs and its documentation.

In our application, using Manage Nuget packages install swagger.