code: def test_base_init(self):
      fig, ax = plt.subplots()
  
      s3 = AsinhScale(axis=None, base=3)
      assert s3._base == 3
      assert s3._subs == (2,)
  
      s7 = AsinhScale(axis=None, base=7, subs=(2, 4))
      assert s7._base == 7
      assert s7._subs == (2, 4)
  
imports: import copy
  import matplotlib.pyplot
  from matplotlib.scale import AsinhScale, AsinhTransform, LogTransform, InvertedLogTransform, SymmetricalLogTransform
  import matplotlib.scale
  from matplotlib.ticker import AsinhLocator, LogFormatterSciNotation
  from matplotlib.testing.decorators import check_figures_equal, image_comparison
  import numpy
  from numpy.testing import assert_allclose
  import io
  import pytest
label_desc: Use image node_id 3 for calling the TestAsinhScale obj's underlying member method code with example usage: obj.test_base_init() without return types