How to UNit test the API controller methods - asp.net-core-webapi

Question

I am really stuck and need your help.
I have a .NET Core 2.1 API and I want to create a nUnitTest project (NUnit 3.10.1) to test the controller of the API but I don't know how to call the controller's action method from the nUnitTest and really need some help.
Things I have tried:
1) Generate parameterless constructor in the controller and instantiate controller from the Test method but that doesn't work.
2) Generate a constructor in the Test class to define the db context but that also doesn't work.
Here is my API Controller:
public class PersonController : ControllerBase
{
private readonly NetCoreAPI1Context _context;
public PersonController(NetCoreAPI1Context context)
{
_context = context;
}
// POST: api/Person
[HttpPost]
public async Task<IActionResult> PostPerson([FromBody] Person person)
{
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
_context.Persons.Add(person);
await _context.SaveChangesAsync();
return CreatedAtAction("GetPerson", new { id = person.Id }, person);
}
}
Here is NetCoreAPI1Context class
public class NetCoreAPI1Context : DbContext
{
public NetCoreAPI1Context(DbContextOptions<NetCoreAPI1Context> options)
: base(options)
{
}
public DbSet<Person> Persons { get; set; }
}
Here is Person class
public class Person
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
}
I've verified that the PostPerson action in the controller worked.
I then add a nUnitTest project to the solution.
Here is my simple test class and method:
class PersonControllerTest
{
Person _person;
//NetCoreAPI1Context _context;
[SetUp]
public void Setup()
{
_person = new Person
{
FirstName = "David",
LastName = "Johnson",
Email = "dj#dj.com"
};
}
//public PersonControllerTest(NetCoreAPI1Context context)
//{
// _context = context;
//}
[Test]
public void PostPersonTest()
{
var person = _person; // confirm that "person" has data and ready to be used
//
// HOW To CALL THE COTROLLER METHOD PostPerson(...) HERE????
//
}
}

Answer 1

Here is the step about how to NUnit test:
1.In your nUnitTest project,you need to right-click Dependences and choose add reference(Web Api project):
2.WebApi Project Controller:
[Route("api/[controller]")]
[ApiController]
public class PeopleController : ControllerBase
{
private readonly WebApi2Context _context;
public PeopleController(WebApi2Context context)
{
_context = context;
}
// GET: api/People
[HttpGet]
public async Task<ActionResult<IEnumerable<Person>>> GetPerson()
{
return await _context.Person.ToListAsync();
}
// POST: api/People
[HttpPost]
public async Task<ActionResult> PostPerson(Person person)
{
_context.Person.Add(person);
await _context.SaveChangesAsync();
return CreatedAtAction("GetPerson", new { id = person.Id }, person);
}
}
3.nUnitTest project(Be sure that you have installed the package Microsoft.EntityFrameworkCore and Microsoft.EntityFrameworkCore.SqlServer):
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using NUnit.Framework;
using WebApi2.Controllers;
using WebApi2.Data;
using WebApi2.Models;
namespace NUnitTestProject1
{
class PersonControllerTest
{
public static DbContextOptions<WebApi2Context> dbContextOptions { get; }
public static string connectionString = "Server=(localdb)\\mssqllocaldb;Database=YourDatabaseName;Trusted_Connection=True;MultipleActiveResultSets=true";
Person _person;
static PersonControllerTest()
{
dbContextOptions = new DbContextOptionsBuilder<WebApi2Context>()
.UseSqlServer(connectionString)
.Options;
}
[SetUp]
public void Setup()
{
_person = new Person
{
//Id=1,If Id is not designed by using IDENTITY (1, 1),you need to add this line
FirstName = "David",
LastName = "Johnson",
Email = "dj#dj.com"
};
}
[Test]
public void Test1()
{
var context = new WebApi2Context(dbContextOptions);
PeopleController person = new PeopleController(context);
var data = person.PostPerson(_person);
var response = data.Result as CreatedAtActionResult;
var item = response.Value as Person;
Assert.AreEqual("David", item.FirstName);
Assert.AreEqual("Johnson", item.LastName);
Assert.AreEqual("dj#dj.com", item.Email);
}
}
}
4.Result: