Mock testing dependency injection object reference

Question

First time to create unit testing using mock. I'm having problem as I'm having error on object reference.

Mock<IAccount> mock = new Mock<IAccount>();
var testController = new AccountController(mock.Object);

IActionResult result = testController.Withdraw(1,100,"sample");
Assert.IsInstanceOfType(result, typeof(RedirectToActionResult));

under my AccountController class on deposit method

var _account = _Iaccount.GetAccountById(id);
if (_account.Password != password)
{
    ModelState.AddModelError("Password", "Invalid Password!");
}

having error on _Iaccount as it was on the constructor.

thanks!

Answer 1

You must setup a mock object

var returnAccount = new Account { Name = "Ali" };
mock.Setup(s => s.GetAccountById(It.IsAny<Guid>())).Returns(returnAccount);

GetAccountById will return returnAccount