code: def test_cer_insert(self):
      refs = ["werewolf"]
      preds = ["wereolf"]
      # S = 0, D = 0, I = 1, N = 8, CER = 0.125
      char_error_rate = cer.compute(predictions=preds, references=refs)
      self.assertTrue(abs(char_error_rate - 0.125) < 1e-6)
  
file_path: evaluate/metrics/cer/test_cer.py
imports: import unittest
  from cer import CER
label_desc: Use image node_id 5 for calling the TestCER obj's underlying member method code with example usage: obj.test_cer_insert() without return types