def METHOD_NAME():
    client = boto3.client("kinesis", region_name="ap-southeast-1")
    stream_arn = create_stream(client)
    client.register_stream_consumer(StreamARN=stream_arn, ConsumerName="consumer1")
    client.register_stream_consumer(StreamARN=stream_arn, ConsumerName="consumer2")
    assert len(client.list_stream_consumers(StreamARN=stream_arn)["Consumers"]) == 2
    client.deregister_stream_consumer(StreamARN=stream_arn, ConsumerName="consumer1")
    assert len(client.list_stream_consumers(StreamARN=stream_arn)["Consumers"]) == 1