class_docstr: Tests for kinetic integrals
class_docstr_tok: ["Tests","for","kinetic","integrals"]
docstr: Test that _diff2 function returns a correct value.
docstr_tok: ["Test","that","_diff2","function","returns","a","correct","value","."]
code: def test_diff2(self, i, j, ri, rj, alpha, beta, d):
      r"""Test that _diff2 function returns a correct value."""
      assert np.allclose(
          qchem.integrals._diff2(i, j, ri, rj, alpha, beta), d
      )
  
imports: import pytest
  import pennylane
  from pennylane import numpy
  from pennylane import qchem
label_desc: Use image node_id 1 for calling the TestKinetic obj's underlying member method code with example usage: obj.test_diff2(i, j, ri, rj, alpha, beta, d) without return types