code: def test_check_joined_ok():
      data = pd.Series([1, 7, 3], ["a", "b", "d"])
      ref = pd.Series([3, 2, 4], ["b", "c", "d"])
      ref, data = ref.align(data, join="inner")
      pm._check_missing(ref, "error")
      # should get here
      assert True
  
imports: import numpy
  import pandas
  import os.path
  from pytest import approx, raises, mark, skip
  import lenskit.metrics.predict
  import lenskit.util.test
label_desc: Use image node_id 5 for calling a global function with example usage: test_check_joined_ok() without return types