What is the best option to Mock IOptions for getting configured data from secret.json file in dotnet core

Question

Here is the scenario- I have users that I want to seed from a controller. I have configured default user creds in secret.json file, configured them in services and retrieve them in controller using IOption where T is the DefaultUserCred.cs Now, I want to create xunit test for this. What is the way to achieve this without configuring IService in Test unit.

here's code sample ---  
 private readonly ApplicationDbContext _context;
        private readonly RoleManager<IdentityRole> _roleManager;
        private readonly UserManager<ApplicationUser> _userManager;
        private readonly IWebHostEnvironment _env;
        private readonly DefaultUserOptions _options;
        public SeedController(
            ApplicationDbContext context,
            RoleManager<IdentityRole> roleManager,
            UserManager<ApplicationUser> userManager,
            IWebHostEnvironment env,
            IOptions<DefaultUserOptions> options
            )
        {
            _context = context;
            _roleManager = roleManager;
            _userManager = userManager;
            _env = env;
            _options = options.Value;
        }
public async Task<ActionResult> CreateDefaultUsers()
        {
            string role_RegisteredUser = "RegisteredUser";
            string role_Administrator = "Administrator";
            if (await _roleManager.FindByNameAsync(role_RegisteredUser) ==
             null)
                await _roleManager.CreateAsync(new
                 IdentityRole(role_RegisteredUser));
            if (await _roleManager.FindByNameAsync(role_Administrator) ==
             null)
                await _roleManager.CreateAsync(new
                 IdentityRole(role_Administrator));
            var addedUserList = new List<ApplicationUser>();
            var email_Admin = _options.Admin_Email;
            if (await _userManager.FindByNameAsync(email_Admin) == null)
            {
                var user_Admin = new ApplicationUser()
                {
                    SecurityStamp = Guid.NewGuid().ToString(),
                    UserName = email_Admin,
                    Email = email_Admin,
                };
                await _userManager.CreateAsync(user_Admin, _options.Admin_Password);
                await _userManager.AddToRoleAsync(user_Admin,
                 role_RegisteredUser);
                await _userManager.AddToRoleAsync(user_Admin,
                 role_Administrator);
                user_Admin.EmailConfirmed = true;
                user_Admin.LockoutEnabled = false;
                addedUserList.Add(user_Admin);
            }
            var email_User = _options.User_Email;
            if (await _userManager.FindByNameAsync(email_User) == null)
            {
                var user_User = new ApplicationUser()
                {
                    SecurityStamp = Guid.NewGuid().ToString(),
                    UserName = email_User,
                    Email = email_User
                };
                await _userManager.CreateAsync(user_User, _options.User_Password);
                await _userManager.AddToRoleAsync(user_User,
                 role_RegisteredUser);
                user_User.EmailConfirmed = true;
                user_User.LockoutEnabled = false;
                addedUserList.Add(user_User);
            }
            if (addedUserList.Count > 0)
                await _context.SaveChangesAsync();
            return new JsonResult(new
            {
                Count = addedUserList.Count,
                Users = addedUserList
            });
        }
    }

Thanks for help.

Answer 1

If you are injecting services to controllers, you need to instantiate service in your test. Next, if you are asking for mocking IOption in test, for inject option to service, here you can find a solution.