public void MemoryStream_CopyTo_Invalid()
{
ChunkedMemoryStream memoryStream;
const string BufferSize = "bufferSize";
using (memoryStream = new ChunkedMemoryStream(this.allocator))
{
const string Destination = "destination";
Assert.Throws <ArgumentNullException>(Destination, () => memoryStream.CopyTo(destination: null));
// Validate the destination parameter first.
Assert.Throws <ArgumentNullException>(Destination, () => memoryStream.CopyTo(destination: null, bufferSize: 0));
Assert.Throws <ArgumentNullException>(Destination, () => memoryStream.CopyTo(destination: null, bufferSize: -1));
// Then bufferSize.
Assert.Throws <ArgumentOutOfRangeException>(BufferSize, () => memoryStream.CopyTo(Stream.Null, bufferSize: 0)); // 0-length buffer doesn't make sense.
Assert.Throws <ArgumentOutOfRangeException>(BufferSize, () => memoryStream.CopyTo(Stream.Null, bufferSize: -1));
}
// After the Stream is disposed, we should fail on all CopyTos.
Assert.Throws <ArgumentOutOfRangeException>(BufferSize, () => memoryStream.CopyTo(Stream.Null, bufferSize: 0)); // Not before bufferSize is validated.
Assert.Throws <ArgumentOutOfRangeException>(BufferSize, () => memoryStream.CopyTo(Stream.Null, bufferSize: -1));
ChunkedMemoryStream disposedStream = memoryStream;
// We should throw first for the source being disposed...
Assert.Throws <ObjectDisposedException>(() => memoryStream.CopyTo(disposedStream, 1));
// Then for the destination being disposed.
memoryStream = new ChunkedMemoryStream(this.allocator);
Assert.Throws <ObjectDisposedException>(() => memoryStream.CopyTo(disposedStream, 1));
memoryStream.Dispose();
}