code: def test_read_no_fmt_chunk(self):
      b = b"RIFF" + struct.pack("<L", 12) + b"WAVE"
      b += b"data" + struct.pack("<L", 0)
      with self.assertRaisesRegex(
          wave.Error, "data chunk before fmt chunk"
      ):
          wave.open(io.BytesIO(b))
  
imports: import unittest
  from test import audiotests
  from test import support
  import io
  import struct
  import sys
  import wave
label_desc: Use image node_id 6 for calling the WaveLowLevelTest obj's underlying member method code with example usage: obj.test_read_no_fmt_chunk() without return types