Exploring Extreme Programming
When you clean up code, you often need refactorings that aren’t in any tool, and aren’t in Martin Fowler’s Refactoring catalog. You’re on your own. When this happens, think like a language lawyer and a logician. Language Lawyer and Logician Continue reading Home-Grown Refactorings – Be Careful!
We’ll look at Test-Driven Development (TDD) and Test-Commit-Revert (TCR) in terms of how they work with frequent commits to source control. Test-Driven Development (TDD) Test-Driven Development is often described with this cycle: Red-Green-Refactor (or Red-Green-Gold, as I learned from Alex Continue reading TDD, TCR, and Frequent Commits
Kent Beck’s TCR workflow experiment has generated some good discussion. Rachel Carmena has documented several TDD workflows. I’d like to add an approach that I’ve used for a while: “Call Your Shots”. Call Your Shots If you’re playing pool seriously, you don’t just Continue reading The “Call Your Shots” TDD Workflow
Teams often don’t pay enough attention to language. A team can improve its language by using what Eric Evans calls Ubiquitous Language: “A language structured around the domain model and used by all team members to connect all the activities Continue reading Ubiquitous Language – A Triple-Play for Words
Martin Fowler writes, “Refactoring is the process of changing a software system in such a way that it does not alter the external behavior of the code yet it improves its internal structure.” [Refactoring, 1999, p. xvi] But what does Continue reading Limits of Refactoring: What IS Behavior?
We’ll look at two refactorings suitable for conditional statements: Pull Up Common Head of Conditional and Pull Down Common Tail of Conditional. I originally learned these as performance optimizations but they also help simplify and clarify code. In Refactoring, Martin Continue reading Refactoring: Pull Common Code from Conditional
In our final article in the series on testing graphics, we’ll look at testing internal objects (rather than testing at the display level). We’ll look at several decisions around testing.
Screen-Based Tests: Two Extremes Screen-based tests focus on what’s visible rather than internal representations. We’ll consider two extremes for testing screen-based output: fully manual and fully automated. Then we’ll look at moves that can help you evolve from one to Continue reading Screen-Based Tests: Testing Graphics, Part 3
Hacker’s Delight (2/e), by Henry S. Warren Jr., Addison-Wesley, 2012. Perhaps you’ve seen this trick for swapping two variables without using a temporary: x = x ^ y y = y ^ x x = x ^ y Or maybe Continue reading Hacker’s Delight (2/e) (Review)
In Part 1, we discussed models for graphics. As we move into testing, let’s start with the visible part: the display.