Add unit tests for `_.countBy`, `_.groupBy`, `_.indexBy`, and `_.sortBy` for when a `callback` is not passed.
Add unit tests for `_.countBy`, `_.groupBy`, `_.indexBy`, and `_.sortBy` for when a `callback` is not passed.


Former-commit-id: e3c1760607cb86fc6c3729409d217b4255fb695d
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