code: def test_inverse1(eg_cmaps):
      inv = lambda a: a.inverse()
      assert inv(eg_cmaps.a) is None
      assert inv(eg_cmaps.c) is None
      inv_b = eg_cmaps.b.inverse()
      inv_d = eg_cmaps.d.inverse()
      ident_b = compose(inv_b, eg_cmaps.b)
      ident_d = compose(inv_d, eg_cmaps.d)
      value = np.array([[1.0, 2.0, 3.0]]).T
      assert np.allclose(ident_b(value), value)
      assert np.allclose(ident_d(value), value)
  
imports: from copy import copy
  from types import SimpleNamespace
  import numpy
  from ..coordinate_map import AffineTransform, AxisError, CoordinateMap, CoordMapMaker, CoordMapMakerError, _as_coordinate_map, _fix0, append_io_dim, axmap, compose, drop_io_dim, equivalent, input_axis_index, io_axis_indices, orth_axes, product, shifted_domain_origin, shifted_range_origin
  from ..coordinate_system import CoordinateSystem, CoordinateSystemError, CoordSysMaker
  import pytest
  from numpy.testing import assert_almost_equal, assert_array_equal
label_desc: Use image node_id 10 for calling a global function with example usage: test_inverse1(eg_cmaps) without return types