Do your job and be responsible.
Test everything you write and review. All of the code you work on, whether you are the primary developer, the pairing partner, or the code reviewer, you need to test. Be responsible for all the code you are participate in.
It’s extremely bad behavior to depend on others to test. This usually results in certain parts of the code not being tested, and bugs introduced into the production code base. And then you’re no longer delivering working software. And if your’e not going to deliver working software, then why are you here?
It’s your job to ensure the quality of your code. Own it.
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