public async Task Should_Add_User_To_Group()
{
await redmineManager.AddUserToGroupAsync(groupId, int.Parse(userId));
User user = redmineManager.GetObject <User>(userId.ToString(CultureInfo.InvariantCulture), new NameValueCollection {
{ RedmineKeys.INCLUDE, RedmineKeys.GROUPS }
});
CollectionAssert.AllItemsAreNotNull(user.Groups);
CollectionAssert.AllItemsAreUnique(user.Groups);
Assert.IsTrue(user.Groups.FirstOrDefault(g => g.Id == groupId) != null);
}