added unit test for Tag.related method

[Nirvikalpa108]

Fixes #3480

Hi @jywarren thanks for all your help in getting me started with this codebase. I couldn't run the tests locally. I just get an error saying my Ruby version is not the same as that mentioned in Gemfile. I have some outstanding installation questions which I've asked in an issue for first-timers installing. Hopefully I'll get that sorted soon! Otherwise, let me know if I've done this PR correctly? Thank you so much!! 😃

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[divyabaid16]

Suggested change

puts related.to_json

I don't think that anything is to be printed here. So, there is no need for this statement.

[jywarren]

@Nirvikalpa108 this is super! Perfect, i'm merging it now. Great work! 👍 🎉

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