Qafoo GmbH - passion for software quality

Help you and your team benefit from new perspectives on cutting-edge quality engineering techniques and tools through the Qafoo team weblog.

Qafoo Team Blog

  • Checklist For A Reliable Load-Test

    by Manuel Pichler on Thu, 10 Aug 2017 14:36:31 +0200

    Setting up a load-test that produces results you can rely on is not that simple. But without realistic test-results you cannot be sure that your application handles sudden increases of traffic, rapid spikes or even the initial go-live. And you cannot estimate at which number of users you should scale up your hardware. Both details are very important to keep the application running at all times and guarantee that no revenue or developer sleep is lost because of outages. We have a large checklist of points we go through when setting up performance tests with customers and I wanted to discuss some of the more important points in this blog post.

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  • Why Apache Benchmark Is Not Enough

    by Manuel Pichler on Thu, 10 Aug 2017 14:36:31 +0200

    You are working for months on a new web application or e-commerce system and usually a few weeks or just days before the launch a complete enough feature set is running on a production-like system so that you can run a realistic load-test. Hopefully providing you with accurate picture of the performance of your future system. What should you do, and why is Apache Benchmark usually not sufficient?

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  • Methods Of Teaching

    by Kore Nordmann on Wed, 28 Jun 2017 07:26:46 +0200

    There are many different ways to teach topics of software developments. From recorded lectures to pair programming. Over the time we tried many of them with different customers and different topics. I want to provide you with an overview of what worked best for us for which topic.

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  • Refactoring Singleton Usage to get Testable Code

    by Benjamin Eberlei on Tue, 11 Jul 2017 08:48:44 +0200

    So your code base is littered with singletons and using them? Don't worry, you can start refactoring them out of your code base class by class and introduce increased testability at every step. This strategy is very simple to implement and the propability of breaking your code is very low, especially when you are becoming more experienced with this technique.

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  • Crafting Quality Software 2.0

    by Kore Nordmann on Fri, 30 Jun 2017 09:58:18 +0200

    The second version of our book "Crafting Quality Software – Gems From the Qafoo Blog" is ready and available for download from now on. In the recent months we wrote a lot about refactoring techniques, technical patterns and workflows. This is a topic very close to our hearts and we feel that an update of our book was due.

    Read more on Crafting Quality Software 2.0…
  • Five Tips to Improve Your Unit Testing

    by Tobias Schlitt on Fri, 16 Jun 2017 09:45:16 +0200

    After you got the hang of unit testing there is still so much space for improvement. In this post I want to share five tips with advanced testers I have seen to influence testing in the right direction.

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  • Refactoring with the Advanced Boy Scout Rule

    by Tobias Schlitt on Fri, 12 May 2017 11:32:46 +0200

    When we join teams to coach them with refactoring their legacy code base, many of them are overwhelmed by the sheer mass of code. That typically results in the request for "some refactoring sprints" or even "a complete rewrite". Both is obviously not a solution from the business perspective - feature development and bug fixing needs to go on and the refactoring should not eat up the larges portion of time. But where and how should the team start and how should? What we call the "Advanced Boy Scout Rule" has helped many teams to come over this staleness and reach fast results while continuing to deliver business value.

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  • Extracting Value Objects

    by Benjamin Eberlei on Fri, 19 May 2017 06:58:52 +0200

    Software systems usually get more complex over time. In the beginning a variable starts out to represent something very simple with very few rules and constraints that can are enforced in a single location of the code. We will show you how you can use value object extraction to avoid spreading logic everywhere.

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  • Testing the Untestable

    by Manuel Pichler on Tue, 21 Mar 2017 14:09:56 +0100

    A long time ago I wrote a blog post about Testing file uploads with PHP where I have used a CGI PHP binary and the PHP Testing Framework (short PHPT), which is still used to test PHP itself and PHP extensions. Since the whole topic appears to be still up-to-date, I would like to show a different approach how to test a fileupload in PHP in this post. This time we will use PHP's namespaces instead of a special PHP version to test code that utilizes internal functions.

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  • How You Can Successfully Ship New Code in a Legacy Codebase

    by Benjamin Eberlei on Mon, 22 May 2017 08:24:58 +0200

    Usually the problems software needs to solve get more complex over time. As the software itself needs to model this increased complexity it is often necessary to replace entire subsystems with more efficient or flexible solutions. Instead of starting from scratch whenever this happens (often!), a better solution is to refactor the existing code and therefore reducing the risk of losing existing business rules and knowledge. A good strategy for this kind of change is called "Branch By Abstraction". While the term is certainly clumsy and overloaded, the idea itself is genious. Let's see how it works…

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