code: def test_changing_scale_transform():
      # No warning
      with warnings.catch_warnings(record=True) as record:
          scale_x_continuous(trans="reverse")
          scale_xy.scale_x_reverse(trans="reverse")
          scale_xy.scale_x_log10(trans="log10")
          assert not record, "Issued an unexpected warning"
  
      # Warnings
      with pytest.warns(PlotnineWarning):
          scale_xy.scale_x_reverse(trans="log10")
  
      with pytest.warns(PlotnineWarning):
          scale_xy.scale_x_datetime(trans="identity")
  
      s = scale_xy.scale_x_reverse()
      with pytest.warns(PlotnineWarning):
          s.trans = "log10"
  
imports: import warnings
  from datetime import datetime
  import numpy
  import numpy.testing
  import pandas
  import pytest
  import plotnine
  from plotnine import aes, annotate, element_text, expand_limits, facet_wrap, geom_bar, geom_col, geom_point, ggplot, lims, theme
  from plotnine.exceptions import PlotnineError, PlotnineWarning
  from plotnine.scales import scale_color, scale_color_manual, scale_identity, scale_manual, scale_xy
  from plotnine.scales.scale_alpha import scale_alpha_continuous, scale_alpha_discrete
  from plotnine.scales.scale_linetype import scale_linetype_continuous, scale_linetype_discrete
  from plotnine.scales.scale_manual import _scale_manual
  from plotnine.scales.scale_shape import scale_shape_continuous, scale_shape_discrete
  from plotnine.scales.scale_size import scale_size_area, scale_size_continuous, scale_size_discrete, scale_size_radius
  from plotnine.scales.scale_xy import scale_x_continuous, scale_x_discrete, scale_x_log10, scale_y_continuous
  from plotnine.scales.scales import make_scale
label_desc: Use image node_id 42 for calling a global function with example usage: test_changing_scale_transform() without return types