code: def test_aes():
      result = aes("weight", "hp", color="qsec")
      expected = {"x": "weight", "y": "hp", "color": "qsec"}
      assert result == expected
  
      mapping = aes("weight", "hp", color=stage("qsec"))
      assert mapping["color"].start == "qsec"
      assert mapping._starting["color"] == "qsec"
  
imports: from copy import deepcopy
  import numpy
  import pandas
  import pytest
  from plotnine import aes, after_scale, after_stat, annotate, coord_trans, facet_null, geom_bar, geom_histogram, geom_line, geom_point, ggplot, ggtitle, guides, labs, lims, scale_x_continuous, stage, stat_identity, theme, theme_gray, xlab, xlim, ylab
  from plotnine.exceptions import PlotnineError, PlotnineWarning
  from plotnine.mapping.aes import is_valid_aesthetic
label_desc: Use image node_id 6 for calling a global function with example usage: test_aes() without return types