code: def test_find_replace_single(df):
      assert df["a"].iloc[2] == 3
      df.find_replace(a={3: 5})
      assert df["a"].iloc[2] == 5
  
      assert sum(df["c"] == 2) == 2
      assert sum(df["c"] == 5) == 0
      df.find_replace(c={2: 5})
      assert sum(df["c"] == 2) == 0
      assert sum(df["c"] == 5) == 2
  
file_path: pyjanitor/tests/functions/test_find_replace.py
imports: import numpy
  import pandas
  import pytest
label_desc: Use image node_id 2 for calling a global function with example usage: test_find_replace_single(df) without return types