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