using System;

using System.Threading.Tasks;

using Microsoft.EntityFrameworkCore;

using Moq;

public class Program

{

    public static async Task Main()

    {

        var todo = new TodoItem { Id = 1, Name = "test", IsComplete = true };

        var mockSet = new Mock<DbSet<TodoItem>>();

        mockSet.Setup(s => s.FindAsync(1L)).ReturnsAsync(todo);

​

        var mockContext = new Mock<TodoContext>();

        mockContext.Setup(c => c.TodoItems).Returns(mockSet.Object);

        var service = new TodoItemsController(mockContext.Object);

        var deleteTodo = await service.DeleteTodoItem(1);

        mockSet.Verify(m => m.FindAsync(1L), Times.Once());

        Console.WriteLine("Test complete without error");

    }

}

​

public class TodoContext : DbContext

{

    public virtual DbSet<TodoItem> TodoItems { get; set; }

}

​

public class TodoItem

{

    public int Id { get; set; }

    public string Name { get; set; }

    public bool IsComplete { get; set; }

}

​

public class TodoItemsController

{

    readonly TodoContext _context;

    public TodoItemsController(TodoContext context)

    {

        _context = context;

    }

    public async Task<IActionResult> DeleteTodoItem(long id)

        {

            var todoItem = await _context.TodoItems.FindAsync(id);

            if (todoItem == null)

            {

                return NotFound();

            }

​

            _context.TodoItems.Remove(todoItem);

            await _context.SaveChangesAsync();

​

            return NoContent();

        }

    public NotFoundResult NotFound() { return new NotFoundResult(); }

    public NoContentResult NoContent() { return new NoContentResult(); }

}

​

public interface IActionResult{}

​

public class NotFoundResult : IActionResult {}

​

public class NoContentResult : IActionResult {}