code: def test_email_search_key_detection_by_name():
      df = pd.DataFrame({"email": ["123", "321", "555"]})
  
      assert detector.get_search_key_column(df) == "email"
  
      df = pd.DataFrame({"e-mail": ["123", "321", "555"]})
  
      assert detector.get_search_key_column(df) == "e-mail"
  
      df = pd.DataFrame({"e_mail": ["123", "321", "555"]})
  
      assert detector.get_search_key_column(df) == "e_mail"
  
file_path: upgini/tests/test_email_utils.py
imports: import pandas
  from pandas.testing import assert_frame_equal
  from upgini.metadata import SearchKey
  from upgini.utils.email_utils import EmailSearchKeyConverter, EmailSearchKeyDetector
label_desc: Use image node_id 1 for calling a global function with example usage: test_email_search_key_detection_by_name() without return types