class_docstr: mock cls data class for cls task.
class_docstr_tok: ["mock","cls","data","class","for","cls","task","."]
code: def test_build(self):
      mock_text_cls_data = MockTextCLSData("mock_cls_data")
      mock_text_cls_data.build()
      self.assertTrue(mock_text_cls_data.is_ready())
  
imports: from absl import logging
  import delta.compat
  from delta.data.datasets.mock_text_cls_data import MockTextCLSData
label_desc: Use image node_id 1 for calling the MockTextClsDataTest obj's underlying member method code with example usage: obj.test_build() without return types