public async Task CloseOutputAsync()
{
MemoryStream ms = new MemoryStream();
BsonDataWriter writer = new BsonDataWriter(ms);
Assert.IsTrue(ms.CanRead);
await writer.CloseAsync();
Assert.IsFalse(ms.CanRead);
ms = new MemoryStream();
writer = new BsonDataWriter(ms)
{
CloseOutput = false
};
Assert.IsTrue(ms.CanRead);
await writer.CloseAsync();
Assert.IsTrue(ms.CanRead);
}