code: def test_get_dupes():
      df = pd.DataFrame()
      df["a"] = [1, 2, 1]
      df["b"] = [1, 2, 1]
      df_dupes = df.get_dupes()
      assert df_dupes.shape == (2, 2)
  
      df2 = pd.DataFrame()
      df2["a"] = [1, 2, 3]
      df2["b"] = [1, 2, 3]
      df2_dupes = df2.get_dupes()
      assert df2_dupes.shape == (0, 2)
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_get_dupes() without return types