A while back, I opened (as in ‘made available’) BitSyncHub, a tool to automatically synchronize Bitbucket repositories to Github. At the time I saw no real reason to open source it - it was a quick hack to solve my own problems, and I felt that anyone else could just reproduce it if they wanted to.
Since then, a whole lot of open source projects, including a few big names, has started using the service, and when I had to reply to a recent support request from one of these projects that I did not have time to look into their issue due to daytime work, I realized that some projects are now depending on the service staying up and working.
All testing is not valuable. There. I said it.
If you take a look at the source of Blaag, you might notice a certain lack of tests. No unit test, no tests at all in fact. Does this mean I do not believe in unit tests, TDD and testing in general? No! If you take a look at hgapi, for example, I wrote almost all code using TDD since that was the only way to know I got it right.