public void BankAccount_Controller_Add_ShouldBeOk()
{
//Arrange
var id = 1;
_mockBankAccountService.Setup(bas => bas.Add(_mockBankAccount.Object)).Returns(id);
//Action
IHttpActionResult callback = _bankAccountController.Add(_mockBankAccount.Object);
//Assert
var httpResponse = callback.Should().BeOfType <OkNegotiatedContentResult <int> >().Subject;
httpResponse.Content.Should().Be(id);
_mockBankAccountService.Verify(bas => bas.Add(_mockBankAccount.Object), Times.Once);
}