/// <summary>
/// Asserts that the current object has been initialized already.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="that"></param>
/// <param name="message"></param>
public static void HaveValue <T>(this EventualAssertions <T?> that, string message = null) where T : struct
{
that.NotBeNull(message);
}
