Check if return value is documented.

        @param node: current node of pylint
        @param linenoDocstring: linenumber of docstring

def _checkReturnValueEpytext(self, node, linenoDocstring):
        """
        Check if return value is documented.

        @param node: current node of pylint
        @param linenoDocstring: linenumber of docstring
        """
        # Getter properties don't need to document their return value,
        # but then need to have a return value.
        if 'property' in _getDecoratorsName(node):
            if self._hasReturnValue(node):
                # Getter properties don't need a docstring.
                return

        # Check for return value.
        if self._hasReturnValue(node):
            if node.name.startswith('test_'):
                # Ignore return documentation for test methods.
                return
            if not re.search(r"@return[s]{0,1}\s*:", node.doc):
                self.add_message('W9204', line=linenoDocstring, node=node)
            if not re.search(r"@rtype\s*:", node.doc):
                self.add_message('W9205', line=linenoDocstring, node=node)