Upgrading can go smooth without no bugs and just work. We can make our customer happy, even though we don't have any tests. **The older I am, the more I care about safety**. Not just for now, but for tomorrow and for my safety of my colleagues. Also for the developers, who will work on the project even though I'm long gone. That's why before I start upgrading one approach to another, I want to prepare a safe environment. No razors, no matches, and a couple of tests. The bridge testing techniq...
