I try to be pretty conscience of what I install on a PC whether it’s a test PC or my own laptop. So I was surprised when I was working with Mike Kelly this weekend and he said well just drop Ruby onto the test machine. My reflex was to safeguard the laptop. Nothing against Ruby, I just like to control my environment and wanted to think about what the install might do. A little investigation shows that a Ruby install adds 3,000 folders and 21,000 files. Yeah twenty-one thousand files.
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Ruby also added 48 keys to the registry and 109 values. I should mention that I spent several years testing installs so my reflex comes from experience. One product I tested for a number of years, and at the end of the dev process, I’d test the install as we worked towards the gold CD. (The gold CD is the CD that went to manufacturing. I’ve also done sample tests of the manufactured CD to ensure the production quality of manufacturing. I could digress on the topic of sample size but not today.) I’ve never been able to just install an application since then. In fact, I installed Ruby on a scrap laptop first to check out the install. Old habit.
This also led me to find once again that a couple of old favorite utilities don’t work well with Vista. This isn’t a gripe against Vista, every now and then I go through a pruning process of my test utilities for different reasons. In fact, I blogged about the tool I was hunting for this past weekend. I needed a better tool to checkout dlls loaded in the environment.
So a couple of points. One, if Mike Kelly was willing to drop software onto a laptop without knowing what (if anything) it might add or alter to the environment, then ouch, no doubt testers could tamper with an environment unknowingly. I joked with Mike about this for the balance of the weekend. It was pretty funny. So you might want to think about how you may alter an environment as a factor in the old “it used to work on my machine.”
Did you know that even the order in which you startup applications can matter? How? If multiple applications use the same dll and the same dll is loaded on a workstation in different directories – then the first application started loads the dll. It’s possible (I’ve witnessed this) to have the next application use the loaded dll instead of calling the version it may need from a different directory. See shared in-memory on the following reference and you can see why I want/need a detailed view of the dlls loaded. DLL hell can get a little crazy and take some meticulous tracking to figure it out.
If you want more details on install testing, I wrote an article on installs for Better Software recently, you can find it here. It’s called Navigating the Install.
A second point – when you’re trying to isolate factors, consider the environment. An investigation in this direction has often resolved the “it works on my machine” syndrome. I’ve used tracking tools to see what a developer has loaded on their workstation versus my test PC. On my cleanest personal laptop, I keep a running notepad file with the date and what I’ve installed so at least I can backtrack and possibly determine if a recent install is a culprit. It’s a minor chore and I think worth it. I track toolbar and browser add-in’s too because anything dropped on a PC counts.
21,000 files huh? Mmm.