<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def TST(self, params):
 """ TST Ra, Rb AND Ra and Rb together and update the NZ flag. The result is not set The equivalent of `Ra & Rc` Ra and Rb must be low registers """

        Ra, Rb = self.get_two_parameters(self.TWO_PARAMETER_COMMA_SEPARATED, params)

        self.check_arguments(low_registers=(Ra, Rb))

        def TST_func():
            result = self.register[Ra] & self.register[Rb]
            self.set_NZ_flags(result)

        return TST_func