code: def test_StrCategoryLocator(self):
      locs = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
      unit = cat.UnitData([str(j) for j in locs])
      ticks = cat.StrCategoryLocator(unit._mapping)
      np.testing.assert_array_equal(ticks.tick_values(None, None), locs)
  
imports: import warnings
  import pytest
  import numpy
  import matplotlib
  from matplotlib.axes import Axes
  import matplotlib.pyplot
  import matplotlib.category
  from matplotlib.testing.decorators import check_figures_equal
label_desc: Use image node_id 1 for calling the TestStrCategoryLocator obj's underlying member method code with example usage: obj.test_StrCategoryLocator() without return types