class_docstr: data class test for seq2seq task.
class_docstr_tok: ["data","class","test","for","seq2seq","task","."]
code: def test_build(self):
      mock_text_seq2seq_data = MockTextSeq2SeqData("mock_seq2seq_data")
      mock_text_seq2seq_data.build()
      self.assertTrue(mock_text_seq2seq_data.is_ready())
  
imports: from absl import logging
  import delta.compat
  from delta.data.datasets.mock_text_seq2seq_data import MockTextSeq2SeqData
label_desc: Use image node_id 1 for calling the MockTextSeq2SeqDataTest obj's underlying member method code with example usage: obj.test_build() without return types