def addTypeEqualityFunc(self, typeobj, function):
self._type_equality_funcs[typeobj] = function<EOL>
Add a type specific assertEqual style function to compare a type.

        This method is for use by TestCase subclasses that need to register
        their own type equality functions to provide nicer error messages.

        Args:
            typeobj: The data type to call this function on when both values
                    are of the same type in assertEqual().
            function: The callable taking two arguments and an optional
                    msg= argument that raises self.failureException with a
                    useful error message when the two arguments are not equal.