There is a production system that has been running for many years, first as a PHP application, then as a hybrid with Rails, and now completely in Rails. It's unclear how long it has been around. The oldest git commit is from 5 years ago.
The goal is to keep the system running at all costs. It doesn't matter what code we use as long as nothing breaks. Currently it's at Rails version 3.2.33.
If we don't upgrade any gems we run the chance of becoming obsolete and undeployable. If we upgrade we will need to make changes to the code causing potential bugs to creep in. Not only do we face code rot, but also downtime due to AWS outages.
What would be the first step to make sure nothing breaks? I've spent months writing cucumber (integration) tests but it's hard to cover every edge case. The app has been running so long that most bugs have been fixed and there are few new exceptions. Testing was not a priority from the beginning so most of the code is undocumented.
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