code: def TST(self, params):
          
          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
docs: 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