docstr: Test the error message that should be called when bw is invalid.
docstr_tok: ["Test","the","error","message","that","should","be","called","when","bw","is","invalid","."]
code: def test_wrong_bw_method(self):
      """Test the error message that should be called when bw is invalid."""
      np.random.seed(8765678)
      n_basesample = 50
      data = np.random.randn(n_basesample)
      with pytest.raises(ValueError):
          mlab.GaussianKDE(data, bw_method="invalid")
  
imports: from numpy.testing import assert_allclose, assert_almost_equal, assert_array_equal, assert_array_almost_equal_nulp
  import numpy
  import pytest
  from matplotlib import mlab
label_desc: Use image node_id 11 for calling the TestGaussianKDECustom obj's underlying member method code with example usage: obj.test_wrong_bw_method() without return types