1. this method doesn't check actual logic of method you are testing. it's useless test. tests for this method should demonstrate at least: type of result, type of items in result (plain object, model or just value), acceptable value of `attributes` argument (i would suggest to allow `fieldName` (as string) to get array of values `[1,2,3]`, and `['fieldName']` to get an array of plain objects `[{id:1}, {id:2}, {id:3}]`
2. wrong indentation (should be 4 spaces)