HOT TIP: Ted Young’s "Make Your Code More Testable" class is coming up August 23rd. The class is excellent (and covers much of what I talk about below), Ted is a wonderful teacher – and I scored you a discount code. Go to MakeTestable.com and use code GEEPAW when you sign up to get $75 […]
Ten I-Statements About Refactoring Read More »
My standards for TDD microtests are the same standards I have for shipping code, and I follow them in microtests for the same reason I follow them in shipping code: they make me faster. This geekery muse is comfort food, for me and maybe for you, but I want to keep stressing: I fully endorse
TDD Tests Are First-Class Code Read More »
I think of my style of coding as "microtest TDD". That can be misleading for folks, so let’s take a walk over a few of the ideas, implicit and explicit, that make up the approach. First things first, bear the money premise in mind in all that follows, to wit: "I’m in this for the
Microtest TDD: The Big Picture Read More »
The strategy pattern lets you make "pluggable algorithms", so clients have different behavior without having different code themselves. We often use it to capture the "consequence in code" of some condition, which we can then let other code use without re-testing the condition. Here’s a little java snippet: dimension = horizontal ? width : height
Using the Strategy Pattern Read More »
Another refactoring topic today: dealing with nulls. There are a bunch of techniques, but they amount to a) don’t, and b) do but only one time ever. The basic idea: a null always occurs in a particular context, and in that context, it has a meaning. When we pass it up or down our call-stack,
Dealing with Nulls Read More »
When I can’t test it where it is, I look to move it somewhere else, where I can test it. Today’s notion isn’t so much a single refactoring as it is a strategy that can be achieved in different ways (and different multiple steps). A modern and frequently occurring case: using a cool framework to
Refactoring Strategy: Move It Where You Can Test It Read More »
Another refactoring today: Use the observer pattern to invert an infelicitous dependency. In and of itself, this is a modest refactoring, but its smell often co-presents with others, and unraveling it all can be tricky. (Note: We aren’t remotely done talking about first and second-order refactorings, there are plenty more to go. But I’m not
Refactoring: Invert Dependency With Observer Read More »
Today, another small 2nd-order refactoring. I call it "wrap a Demeter". As with the others, this is a very modest step, but still quite useful in some situations. Demeter violations are places where a client accesses not just an upstream service, but that service’s upstream services, or even that service’s service’s upstream services. It’s a
Refactoring: Demeter-Wrapping Read More »
A key value for those who take up the change-harvesting approach: "keep it running". This is actually a direct result of human, local, oriented, taken, iterative, and argues against many finish-line efficiency approaches. Think of a change as a point A, with an arrow coming out of it and ending at a point B. At
Refactoring: Keep It Running Read More »
In our continuing conversation about refactoring, I want to go a little abstract today, and talk about chunking and naming. Naturally, a topic thisi important has already been addressed by a stupid joke in the movie Airplane!, so we’ll start there. A passenger is approached by a steward, asking if he might be able to
Chunking and Naming Read More »
