You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Small bugs, when released in the wild, will mate and multiply. 
Getting to full test coverage is cheaper than the long-term maintenance and support cost of the bugs you could be catching...
The purpose of unit tests isn't to verify the correctness of the new features you're checking in now. They're primarily a maintenance tool that enables you to make changes with confidence. They're meant to catch bugs in future unforeseen situations. Write them with that mindset.
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