tests the datanettybuffer #getlength method . concode_field_sep ByteBuf mBuffer concode_elem_sep ExpectedException mThrown concode_elem_sep int LENGTH concode_field_sep void bufferAlreadyReleased concode_elem_sep void before concode_elem_sep void getNettyOutputNotSupported concode_elem_sep void singleNioBufferCheckFailed concode_elem_sep void releaseBuffer concode_elem_sep void releaseBufferTest concode_elem_sep void refCountCheckFailed concode_elem_sep void readOnlyByteBuffer concode_elem_sep void after concode_elem_sep void releaseBufferFail