code: def setUp(self):
      self.data = TSVDataSource(
          SafeFileWrapper(
              tests_module.test_file("train_dense_features_tiny.tsv")
          ),
          SafeFileWrapper(
              tests_module.test_file("test_dense_features_tiny.tsv")
          ),
          eval_file=None,
          field_names=["label", "slots", "text", "dense"],
          schema={"text": str, "label": str},
      )
  
imports: import unittest
  from typing import List
  from pytext.data.sources.data_source import SafeFileWrapper
  from pytext.data.sources.tsv import BlockShardedTSVDataSource, SessionTSVDataSource, TSVDataSource
  from pytext.utils.test import import_tests_module
label_desc: Use image node_id 1 for calling the TSVDataSourceTest obj's underlying member method code with example usage: obj.setUp() without return types