code: def test_bin32():
      header = b"\xc6"
      data = b"x" * 65536
      b = packb(data, use_bin_type=True)
      assert len(b) == len(data) + 5
      assert b[0:1] == header
      assert b[1:5] == b"\x00\x01\x00\x00"
      assert b[5:] == data
      assert unpackb(b) == data
  
imports: from pandas.io.msgpack import ExtType, packb, unpackb
label_desc: Use image node_id 4 for calling a global function with example usage: test_bin32() without return types