public void ValidateAndRegisterUserIfNotExisting_WithNonExistingUser_ShouldRegisterUser()
{
// Arrange .
const string email = "*****@*****.**";
var name = new Tuple <string, string>("Ananth", "Tatachar");
var userName = $"{name.Item1} {name.Item2}";
_userInfoProvider.GetFirstAndLastNames(userName)
.ReturnsForAnyArgs(name);
_userInfoProvider.GetUser(name, email).ReturnsNullForAnyArgs();
// Act .
_target.ValidateAndRegisterUserIfNotExist($"{name.Item1} {name.Item2}", email);
// Assert .
_userInfoProvider.Received().RegisterUser(name, email);
}