sets up the stream before a test runs . concode_field_sep byte[] INCREASING_BYTES concode_elem_sep long BLOCK_LENGTH concode_elem_sep TestBufferedBlockOutStream mTestStream concode_elem_sep ExpectedException mThrown concode_field_sep void byteArrayAtOffset concode_elem_sep void byteArrayWrite concode_elem_sep void doubleFlush concode_elem_sep void singleByteWrite concode_elem_sep void writePastBlock concode_elem_sep void remaining concode_elem_sep void writeToClosed