Create integration test for joinAdInterestGroup

[brodrigu]

Setup test infrastructure and implement the following tests for joinAdInterestGroup:

send expected params

joinAdInterestGroup({
    "owner": "dsp.example",
    "name": "foo>",
    "bidding_logic_url": "https://dsp.example/bidding_logic_url",
    "daily_update_url": "https://dsp.example/daily_update_url",
    "trusted_bidding_signals_url": "https://dsp.example/trusted_bidding_signals_url",
    "trusted_bidding_signals_keys": "foo",
    "user_bidding_signals": { "key": "value" },
    "ads": [ {" id": "adid", "url": "https://dsp.example/ad_url" } ]
}, 30 * msInDay);

and inspect indexedDB to validate it is added as expected

{
    "_created": "<Date.now()>",
    "_updated": "<unix_timestamp_in_ms_from_daily_update_url_call>",
    "_expires": "<this._created + (expiry * 86400000)>",
    "owner": "<options.owner>",
    "name": "<options.name>",
    "bidding_logic_url": "<options.bidding_logic_url>",
    "daily_update_url": "<options.daily_update_url>",
    "trusted_bidding_signals_url": "<options.tbs_url>",
    "trusted_bidding_signals_keys": "<options.tbs_keys>",
    "user_bidding_signals": "<options.user_bidding_signals>",
    "ads": "<options.ads>"
  }

[iamnewton]

You might also want to check for these conditions:

1. If the same owner and name is passed in, then "merge" with the existing data, update the internal updated field to the current time and expires field will be 30 days past the current time
2. If owner or name is passed in and doesn't match an existing group, then create an entirely new record with the options passed in, adding in the internal created field and updated field to the current date