For projects of any value and significance, having a comprehensive automated test suite is nowadays considered a standard software engineering practice. Why, then, don’t we see more prominent FOSS projects employing this practice?
By Alexandros Frantzis, Senior Software Engineer at Collabora.
A few times in the recent past I’ve been in the unfortunate position of using a prominent Free and Open Source Software (FOSS) program or library, and running into issues of such fundamental nature that made me wonder how those issues even made it into a release.
In all cases, the answer came quickly when I realized that, invariably, the project involved either didn’t have a test suite, or, if it did have one, it was not adequately comprehensive.
I am using the term comprehensive in a very practical, non extreme way. I understand that it’s often not feasible to test every possible scenario and interaction, but, at the very least, a decent test suite should ensure that under typical circumstances the code delivers all the functionality it promises to.
For projects of any value and significance, having such a comprehensive automated test suite is nowadays considered a standard software engineering practice. Why, then, don’t we see more prominent FOSS projects employing this practice, or, when they do, why is it often employed poorly?
In this post I will highlight some of the reasons that I believe play a role in the low adoption of proper automated testing in FOSS projects, and argue why these reasons may be misguided. I will focus on topics that are especially relevant from a FOSS perspective, omitting considerations, which, although important, are not particular to FOSS.
My hope is that by shedding some light on this topic, more FOSS projects will consider employing an automated test suite.
As you can imagine, I am a strong proponent of automating testing, but this doesn’t mean I consider it a silver bullet. I do believe, however, that it is an indispensable tool in the software engineering toolbox, which should only be forsaken after careful consideration.
1. Underestimating the cost of bugs
Most FOSS projects, at least those not supported by some commercial entity, don’t come with any warranty; it’s even stated in the various licenses! The lack of any formal obligations makes it relatively inexpensive, both in terms of time and money, to have the occasional bug in the codebase. This means that there are fewer incentives for the developer to spend extra resources to try to safeguard against bugs. When bugs come up, the developers can decide at their own leisure if and when to fix them and when to release the fixed version. Easy!
At first sight, this may seem like a reasonably pragmatic attitude to have. After all, if fixing bugs is so cheap, is it worth spending extra resources trying to prevent them?
Unfortunately, bugs are only cheap for the developer, not for the users who may depend on the project for important tasks. Users expect the code to work properly and can get frustrated or disappointed if this is not the case, regardless of whether there is any formal warranty. This is even more pronounced when security concerns are involved, for which the cost to users can be devastating.
Of course, lack of formal obligations doesn’t mean that there is no driver for quality in FOSS projects. On the contrary, there is an exceptionally strong driver: professional pride. In FOSS projects the developers are in the spotlight and no (decent) developer wants to be associated with a low quality, bug infested codebase. It’s just that, due to the mentality stated above, in many FOSS projects the trade-offs developers make seem to favor a reactive rather than proactive attitude.
2. Overtrusting code reviews
One of the development practices FOSS projects employ ardently is code reviews. Code reviews happen naturally in FOSS projects, even in small ones, since most contributors don’t have commit access to the code repository and the original author has to approve any contributions. In larger projects there are often more structured procedures which involve sending patches to a mailing list or to a dedicated reviewing platform. Unfortunately, in some projects the trust on code reviews is so great, that other practices, like automated testing, are forsaken.
There is no question that code reviews are one of the best ways to maintain and improve the quality of a codebase. They can help ensure that code is designed properly, it is aligned with the overall architecture and furthers the long term goals of the project. They also help catch bugs, but only some of them, some of the time!
The main problem with code reviews is that we, the reviewers, are only human. We humans are great at creative thought, but we are also great at overlooking things, occasionally filling in the gaps with our own unicorns-and-rainbows inspired reality. Another reason is that we tend to focus more on the code changes at a local level, and less on how the code changes affect the system as a whole. This is not an inherent problem with the process itself but rather a limitation of humans performing the process. When a codebase gets large enough, it’s difficult for our brains to keep all the possible states and code paths in mind and check them mentally, even in a codebase that is properly designed.
In theory, the problem of human limitations is offset by the open nature of the code. We even have the so called Linus’s law which states that “given enough eyeballs, all bugs are shallow”. Note the clever use of the indeterminate term “enough”. How many are enough? How about the qualitative aspects of the “eyeballs”?
The reality is that most contributions to big, successful FOSS projects are reviewed on average by a couple of people. Some projects are better, most are worse, but in no case does being FOSS magically lead to a large number of reviewers tirelessly checking code contributions. This limit in the number of reviewers also limits the extent to which code reviews can stand as the only process to ensure quality.
