Automated tests: Why? How they help? Who needs them?
There are many types of automated tests out there. Let’s see the most used types of tests and understand how each one is useful.
Types of tests covered are:
- Unit Tests are isolated, focused on methods and classes. White box tests.
- Integration Tests are for checking how two different modules integrate. Black box tests.
- Integrated Tests are big, large tests showing how many modules integrate, with a business purpose. Black box tests.
- Acceptance Tests are showing that a features works well. Black box tests.
- Contract Tests are a special type of tests, that verify polymorphism integration of multiple components or classes.
Let’s take them one by one in detail.
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Blog post series
This blog post is part of a series about legacy coderetreat and legacy code techniques you can apply during your work. Please click to see more sessions about legacy code.
A bit of history
On 26 November 2011 I had the honour of being an attendee at the second ever Legacy Coderetreat, which was supposed to be the first one in the world. But my friend Johan Martinsson from Grenoble beat Erik and me to it. Anyway I was part of the second ever Legacy Coderetreat in the world, facilitated by JB Rainsberger. JB had come with this concept of using the Coderetreat format, but for legacy code.
At the beginning of the day he presented us the problem, like in any other coderetreat. The problem was an ugly trivia game and you can find the sources here. At that time the code base was translated, from Java, only in a couple of other languages. Now you can find almost any language you want, thanks to the worldwide community of passionate developers who translated the code base.
JB facilitated the event like you could find in here, with a lot of details. But in short we would start with a free session, then follow with Golden Masters, continue with Subclass to Test, Replace Inheritance with Delegation and then Pure Functions. After each iteration we deleted the code like in any other coderetreat and swapped the pairs.
I liked a lot the fact that JB started this idea, because I am a big lover of working with legacy code. And this Legacy Coderetreat is such a good way to practice. But I had some other ideas on how to make it different.
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The history of Taking Baby Steps
Let me tell you a story on how I thought about teaching other programmers how to take small steps to help them minimize the mistakes by focusing on a small thought.
Taking Baby Steps
A couple of years ago I was working on a legacy project, meaning I did not know anything about the business, and it was written in Delphi .Net which was totally unknown to me. I needed to translate this medium-sized code-base from Delphi .Net into .Net / Silverlight.
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