new_contents: """Test of data module."""
  
  from dasem.data import wordsim353
  
  
  def test_wordsim353():
      """Test of wordsim353 data."""
      df = wordsim353()
      assert not df.da1.isnull().any()
      assert not df.da2.isnull().any()
  
      mapper = {}
      for idx, row in df.iterrows():
          if row['Word 1'] in mapper:
              assert mapper[row['Word 1']] == row['da1']
          if row['Word 2'] in mapper:
              assert mapper[row['Word 2']] == row['da2']
          mapper[row['Word 1']] = row['da1']
          mapper[row['Word 2']] = row['da2']
  
subject: Create test_data.py