Add test for responses with tags

[rlindner]

Hey @HoLo85, I've used the sample data you've provided here to write some unit test. One of the tests, which validates parsing "tag"-values failed, so I've extracted that test as this separate PR here.

Would you like to verify, if either the test data isn't correct or we need to adjust the parsing to support those tags properly? You can run the tests with npm test. I'd be happy for feedback if this setup works for you as well.

[HoLo85]

Hi, as far as i can see the response for the tag value is wrong, if it is read from the inverter it looks like this:

{
    "6180_08652500": {
        "1": [
            {
                "val": [
                    {
                        "tag": 303
                    }
                ]
            }
        ]
    }
}

[rlindner]

Thanks, missed that bit. 👍