class_docstr: data class test for nlu-joint task.
class_docstr_tok: ["data","class","test","for","nlu-joint","task","."]
code: def test_build(self):
      atis2 = ATIS2("/atis2")
      atis2.build()
      self.assertTrue(atis2.is_ready())
  
imports: from absl import logging
  import delta.compat
  from delta.data.datasets.atis2 import ATIS2
label_desc: Use image node_id 1 for calling the ATIS2Test obj's underlying member method code with example usage: obj.test_build() without return types