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you should try the spanish "narices" (nose), "huevos" (eggs) or "cojones" ("testicles" colloquial with vulgar tendence)
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Anything that is unrelated to elephants is irrelephant Anonymous - The problem with quotes on the internet is that you can never tell if they're genuine Winston Churchill, 1944 - Never argue with a fool. Onlookers may not be able to tell the difference. Mark Twain
Or don't take the medication at all, and become the bartender at James Bonds favorite pub.
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
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I have a colleague who has been the Lone Ranger in a project for a couple of years now but recently that project's problems has become a much higher priority (it's a system for the gov't and we've landed a significant new contract to expand this service to a larger number of gov't agencies, ergo the higher visibility).
A small group of us have been moved onto the project to help get everything up to snuff. He has long complained that he doesn't have the ability to test code before pushing it to develop, which is partially true.
However, there is some basic testing he COULD do but apparently doesn't since I can't get my code tested for finding bugs in stuff he's pushed to develop. Things like testing the SQL to make sure it doesn't throw syntax errors or "Inconsistent types" (comparing a boolean to a string)
Since he's been the Lone Ranger in this code for so long, he's a little prickly about us coming into his domain.
How tactful should I be and how long should I remain tactful?
You said that it's partially true that he can't test his code before submitting it. For some reason, this wasn't a big deal before, but now it is because the project is higher profile with more people working on it, probably with harder deadlines.
If I understand the situation correctly, he needs to be available to help downstream developers debug his code when it doesn't work. The tricky part is that those developers can't interrupt him until they're reasonably sure that the problem lies with his code. It's no fun to be interrupted for this kind of thing, so it will encourage him to test his code to whatever extent possible.
In parallel with this, it sounds like you need automated tests that he can run, and that the downstream developers will have to create those tests. I assume this because, otherwise, he could presumably run those tests himself, whether automated or not.
This is not a question of tact but should be seen as a reasonable way to speed up development.