A few weeks ago I spoke at the EuroSTAR software testing conference in Prague. The conference had one and a half days of tutorials, followed by two and a half days of talks. Around a thousand people attended. I was impressed by the sense of community and by the number of activities offered. For climate reasons, I chose to travel there and back by train instead of flying. Continue reading
I like to use Test-Driven Development (TDD) when coding. However, in some circumstances, TDD is more of a hinderance than a help. This happens when how to solve the problem is not clear. Then it is better to first write a solution and evaluate if it solves the problem. Writing tests only makes sense after the solution is viable. Continue reading
At the end of May I attended Nordic Testing Days in Tallinn, Estonia. It was the first time I spoke at a conference outside of Sweden, and I had a great time. There was one day with tutorials, and two days with workshops and regular half hour talks. Here are my impressions: Continue reading
For the past few years, I have heard many people advocating using only automatic tests. For example, if all the automatic tests pass, then the code should automatically be deployed to production. I have always performed a bit of manual testing before feeling confident about my code. So for the past year I have paid extra attention to bugs I have found manually testing my own code. My conclusion: manual testing is still needed. Continue reading
I recently found out about the book Developer Testing – Building Quality Into Software by Alexander Tarlinder, and I immediately wanted to read it. Even though I am a developer at heart, I have always been interested in software testing (I even worked as a tester for two years).
I think the subject of the book, developer testing, is timely. There seems to be a broad trend where more and more responsibility for testing is given to developers. It follows from the move towards micro services, dev ops and the “you built it, you run it” principle. Another driving force is the prevalence of developer testing frameworks that started with JUnit and now includes many more. These frameworks encourage and help developers write automatic tests.
Despite this trend of increasing developer testing, my feeling is that many developers still don’t test their programs well enough. For example, they may test the “happy path”, but not the different error handling cases. That is why I was excited about this new book explicitly addressing developer testing. Continue reading
In Learning From Your Bugs, I wrote about how I have been keeping track of the most interesting bugs I have come across. I recently reviewed all 194 entries (going back 13 years), to see what lessons I have learned from them. Here are the most important lessons, split into the categories of coding, testing and debugging:
Bugs are great learning opportunities. So how do we make sure we learn as much as possible from the bugs we fix? A method I have used for more than 13 years now is to write down a short description of the bug, the fix, and the lessons I learned.
Way back in 2002, I came across a blog post (that I unfortunately can’t find again) that described this method. I have used it ever since, and I believe it has helped me become a better software developer.
Every time I fix a particularly tricky or interesting bug, I take a few minutes to write down some facts about it. Here is an example of a typical entry: Continue reading
When I first heard about unit testing using a framework like JUnit, I thought it was such a simple and powerful concept. Instead of ad hoc testing, you save your tests, and they can be run as often as you like. In my mind, the concept didn’t leave much room for misunderstanding. However, over the years I have seen several ways of using unit tests that I think are more or less wrong. Here are 5, in order of importance:
When I found out about the book “How Google Tests Software“, it didn’t take long until I had ordered a copy. I find it quite fascinating to read about how Google does things, whether it is about their development process, their infrastructure, their hiring process, or, in this case, how they test their software. I am a developer at heart, but I have worked for a few years as a tester, so testing is also dear to me.
It’s quite an interesting book, and it makes some great points about the future of testing. However, despite the phrase “Help me test like Google” on the cover, it is not as useful as I had hoped when it comes to improving your own testing. Continue reading