code: def setUp(self):
      super().setUp()
      self.tempfile_1 = self.create_tempfile(
          content=b"YUV4MPEG2 W4 H2 F30:1 Ip A0:0 C420jpeg\nFRAME\nABCDEFGHIJKL"
      )
      self.tempfile_2 = self.create_tempfile(
          content=b"YUV4MPEG2 C444 W1 H1\nFRAME\nabcFRAME\ndef"
      )
  
imports: import tensorflow
  from tensorflow_compression.python.datasets import y4m_dataset
label_desc: Use image node_id 1 for calling the Y4MDatasetTest obj's underlying member method code with example usage: obj.setUp() without return types