Saturday, January 12, 2008

Enterprise Agile Testing Part I : Introduction

The idea of "Enterprise Agile Testing" has been in my head for several months now, result of what I have learned at Guidewire and based on my previous XP experience at ThoughtWorks. I am planning on a proposal to Agile 2008 on this topic. Before I can choose my proposal topic, I need to write everything down first, kind of like a project engagement.

Actually, project engagement is not a bad analogy. I must define what my proposal is about and what it not about --- what is out of scope if you will. My approach is to write a series of blog posts, each cover a specific topic and look back to see what I end up with when I am done. If I approach it as if I like writing a book or even like that agile 2007 paper, I might never finish it.

The Enterprise in Agile Testing

Enterprise here means large scale software development. The large scale can come about through a large code base or a large team. Here I am ignoring the controversial topic of whether or not large code base or large team are problems that should be avoided in the first place. They exist, I just want to point out two things that result from them with regarding testing in such an environment.

First, with a large code base, a tester cannot clearly hold onto the code's design in his or her head, let alone the intention of the test. Instead, agile testing in enterprise environments requires a comprehensive testing framework. This framework must do more than what JUnit does out-of-the box, so that anyone (including you) can come back to a test at any time and understand it.

Second, with large team, it is pretty much impossible to ensure everyone is aware of how important testing is. This is not to say that you should give up on a large team's continuous improvement on treating testing seriously and writing better tests, but I have found out that the line of "Zero Test breakage" is extremely hard to hold. As a result, some middle ground must be reached between complete awareness and total ignorance. Only in this way is it possible to see results in testing improvement efforts.

Agile

Since Rob and Jim pulled me away from the EJB madness and introduced me to the wonderful world of XP in 2001, "Enterprise" has slowly restored its place in my vocabulary. At the same time, the term "Agile" is getting closer and closer to my list of red flag words.

Agile here refers to the situation where the code is constantly under changes. This can happen because the requirements keep changing, or the development is done iteratively through story driven development. Constant change makes the ability to write concise tests more important. Additionally, the tests status of project must be treated as more than a binary state if testing is to keep pace with development. In this way, the development would not be paralyzed because there will almost always a test broken here and there, and the turn-around time for testing the checked-in code is not as short as 10 minutes.

Testing

So you have a large project code base that you keep changing, with a team of members with mixed skills. You need to ensure that the code (including the tests) you write is of high enough quality so that two moths from now you can still read them, understand what they do, understand why they do that, and change them. At the same time, you want to give others the time and tools to adjust to test infected development and hopefully test-driven development eventually.

Content and Structure

So, the above is the introduction. The items that are in my mind are as following, I'll update the links as I post them.
  • Test utilities like assertion, builder
  • TestBase with annotations for test environment configuration
  • ToolsHarness, a continuous integration server that treats tests individually
  • Active and stable branch, localizing the damage
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