new_contents: from sharepa.analysis import merge_dataframes
  
  import pandas as pd
  
  
  def test_merge_dataframes():
      dream = pd.DataFrame({'Rhodes': 'Dusty'}, index=['Rhodes'])
      stardust = pd.DataFrame({'Rhodes': 'Cody'}, index=['Rhodes'])
  
      family = merge_dataframes(dream, stardust)
  
      assert isinstance(family, pd.core.frame.DataFrame)
      assert family.columns.values.tolist() == ['Rhodes', 'Rhodes']
  
subject: add tests for testing analysis