public async Task GetDecryptedUsernameByID_returns_null_for_non_existing_id()
{
var service = new UserInfoLoader(context);
string result = await service.GetUserNameById(3);
Assert.IsNull(result);
}
public async Task GetDecryptedUsernameByID_returns_decrypted_username()
{
var service = new UserInfoLoader(context);
string result = await service.GetUserNameById(1);
Assert.AreEqual("teacher", result);
}