text: def test_get_charge(case_data):
      """
      Test :meth:`.Atom.get_charge`.
  
      Parameters
      ----------
      case_data : :class:`.CaseData`
          The test case. Holds the atom to test and its correct charge.
  
      Returns
      -------
      None : :class:`NoneType`
  
      """
  
      assert case_data.atom.get_charge() == case_data.charge
  