· testing unit-test

Writing unit tests can be fun

I recently came across Pavel Brodzinski’s blog and while browsing through some of his most recent posts I came across one discussing when unit testing doesn’t work.

The majority of what Pavel says I’ve seen happen before on projects I’ve worked on but I disagree with his suggestion that writing unit tests is boring:

I think it depends on the way that the unit tests are being written.

When I first started working at ThoughtWorks I used to think that writing tests was boring and that it was much more fun writing production code. A couple of years have gone by since then and I think I actually get more enjoyment out of writing tests these days.

There are some things we’ve done on teams I’ve worked on which contribute to my enjoyment when writing unit tests:

I had a bit of an idea of how to do that but coming up with little examples to drive out the algorithm helped me a lot as I find it very difficult to keep large problems in my head.

The key with following the small steps approach is to only writing one test at a time as that helps keep you focused on just that one use of this class which I find much easier than considering all the cases at the same time.

The feeling of progress all the time, however small, contributes to my enjoyment of using this approach.

The process of moving up and down the code as we discover different objects that should be created and different places where functionality should be written means that writing our tests/examples first is a much more enjoyable process than writing them afterwards.

The additional enjoyment in this process comes from the fact that we often discover scenarios of code use and problems that we probably wouldn’t have come across if we hadn’t driven our code that way.

I like it to become a bit of a game whereby when it’s your turn to write the code you write just the minimal amount of code possible to make the test pass before driving out a proper implementation with the next test you write.

I think this makes the whole process much more light hearted than it can be otherwise.

Even if we choose not to unit test because we find it boring we’re still going to test the code whether or not we do it in an automated way!

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