In essence, everything is a string.
Well, you can always go one layer deeper and find out what a string really is, but for web apps I work on, both input data and output data are strings. The input is an HTTP request, which is a plain-text message that gets passed to the web server, the PHP server, the framework, and finally a user-land controller. The output is an HTTP response, which is also a plain-text message that gets passed to the client. If my app needs the database to load or store some data, that data too is in its initial form a string. It needs to be deserialized into objects to do something and later be serialized into strings so we can store the results.
"Yes, I know. Our tests aren't perfect, but it's better to test anything than to test nothing at all, right?"
Let's look into that for a bit. We'll try the "Fowler Heuristic" first:
One of my favourite (of the many) things I learned from consulting with Martin Fowler is that he would often ask "Compared to what?"
- Agile helps you ship faster!
- Compared to what?
Often there is no baseline.
-- Daniel Terhorst-North
Whenever I read a test method I want to understand it without having to jump around in the test class (or worse, in dependencies). If I want to know more, I should be able to "click" on one of the method calls and find out more.
I'll explain later why I want this, but first I'll show you how to get to this point.