public void When_a_template_containing_a_user_token_is_formatted_then_the_user_token_is_replaced_with_the_users_name()
{
var user = Mock.Of <IUser>();
Mock.Get(user)
.Setup(x => x.DisplayName)
.Returns("you");
var result = TestInstance.FormatMessage(
user,
$"Hi {CookieMessageTokens.USER_DISPLAY_NAME}!");
result.ShouldBe("Hi you!");
}