it("#setVoltageTripPoints calls #command with params", function() {
      core.setVoltageTripPoints(0xFF00, 0x00FF, callback);
      expect(core.command).to.be.calledOnce;
      expect(core.command)
        .to.be.calledWith(0x00, 0x24, [0xFF, 0x00, 0x00, 0xFF], callback);