[cli] Provide better logs related to dir structure when running tests #4213
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In #4210 a contributor was unable to run tests when create a new lib def because they may have made a mistake when initially trying to create the dir structure. This throws an error but it's not one that's descriptive enough to help them pinpoint where to go to solve the issue.
Other notes, when I was building this fix I opened the
definitions/npm
dir in my finder and then it started throwing a lot of errors related toDS_Store
I think instead of throwing we should just exit in that case so I've added that also.