public async Task Add_Throws_Error_When_Called_After_Dispose()
{
var instance = new PpcBuffer <object>(ConcurrentBuffer.Unbounded, CancellationToken.None);
#if !NETFRAMEWORK
await instance.DisposeAsync().ConfigureAwait(false);
#else
instance.Dispose();
#endif
Assert.Throws <NullReferenceException>(() => instance.Add(new object(), CancellationToken.None));
await Task.CompletedTask;
}