code: def test_mean_se():
      p = ggplot(data, aes("x", "y")) + stat_summary(
          fun_data="mean_se", size=2
      )
  
      assert p == "mean_se"
  
file_path: plotnine/tests/test_stat_summary.py
imports: import numpy
  import pandas
  import pytest
  from plotnine import aes, geom_point, ggplot, stat_summary
label_desc: Use image node_id 5 for calling a global function with example usage: test_mean_se() without return types