code: def test_dispatch(self):
      class ShouldDispatch:
          def __array_function__(self, function, types, args, kwargs):
              return types, args, kwargs
  
      xy = [1, 2]
      s_d = ShouldDispatch()
      r = histogram2d(s_d, xy)
      # Cannot use assert_equal since that dispatches...
      assert_(r == ((ShouldDispatch,), (s_d, xy), {}))
      r = histogram2d(xy, s_d)
      assert_(r == ((ShouldDispatch,), (xy, s_d), {}))
      r = histogram2d(xy, xy, bins=s_d)
      assert_(r, ((ShouldDispatch,), (xy, xy), dict(bins=s_d)))
      r = histogram2d(xy, xy, bins=[s_d, 5])
      assert_(r, ((ShouldDispatch,), (xy, xy), dict(bins=[s_d, 5])))
      assert_raises(Exception, histogram2d, xy, xy, bins=[s_d])
      r = histogram2d(xy, xy, weights=s_d)
      assert_(r, ((ShouldDispatch,), (xy, xy), dict(weights=s_d)))
  
imports: from numpy.testing import assert_equal, assert_array_equal, assert_array_max_ulp, assert_array_almost_equal, assert_raises, assert_
  from numpy import arange, add, fliplr, flipud, zeros, ones, eye, array, diag, histogram2d, tri, mask_indices, triu_indices, triu_indices_from, tril_indices, tril_indices_from, vander
  import numpy
  import pytest
label_desc: Use image node_id 7 for calling the TestHistogram2d obj's underlying member method code with example usage: obj.test_dispatch() and returns: types,  args,  kwargs