#11 tg-discord-bot: update tests

[tg-discord-bot](https://git.joystreamstats.live/Operations/community-repo/commits/discord) posts to telegram and discord - `yarn run tests` fails - sometimes posts are announced multiple times there should be proper tests to avoid spamming - example: keep records like [video bot](https://git.joystreamstats.live/Operations/community-repo/src/master/community-contributions/joystreamvideobot/src/bot.ts#L80)