public void AddUser()
{
Guid userId = Guid.NewGuid();
const string userName = "user";
sut.AddUser(userId, userName);
sut.SaveChanges();
using (DbContext readContext = new DbContext())
{
User user = readContext.Users.Single();
Assert.AreEqual(userId, user.Id);
Assert.AreEqual(userName, user.Name);
}
}