Code Quality 2024 Part 4: Collaboration and Software Development

 

Why collaboration influences software quality? This is a very simple answer. If you have a bazaar of ideas or solutions you can select the best idea. Or to describe it a little bit more mathematically, if you know at least two solutions from N and selecting the best of the two, you have guarantee that you solution is not the worst. Software development is not a game of perfect, it’s more important not to pick the worst solution. And if you put some statistics in it, you have two random solutions, then you can imagine the benefit of collaboration.

Collaboration in the Real World

Collaboration in the Real World doesn’t exists, mostly. But try it, try pair programming, learn how to do pair programming. It takes a really log time to establish pair programming. Don’t give up.

Code Quality Part 3: Use Test Driven Developmen (TDD)

First, TDD is not about having unit tests. TDD is a about software design and about specifying software requirements. Using TDD will improve your coding and the product.

TDD and Legacy Code

TDD and legacy Code is a combination from hell. Use TDD for new code parts. TDD will punctual improve the software quality. Don’t try to TTD-ing the complete legacy code, this is an idea from hell, you will get mad. Containment is the better option for legacy code. Build some tests around your legacy code, that covers and describes the most important code flows.

OK some words why I’m a big TDD fan.

- TDD saves time by reducing the time finding bugs in your implementation and believe me your code and my code containing bugs at least in the early iterations. A debugger is common tool for most developers, I don’t need it. I take the debugger only if I handle legacy code. TDD is an inverse debugger.

- It makes refactoring save and enables iterative software development

- It’s a driver for decomposition and the separation of concerns

- You don’t have to write extra tests, only few integration tests

I never seen TDD in real life. That means most developers are not using TDD.

There is on major disadvantage of TDD, it is not common. Every developer heard about TDD but that’s all.

What are barriers of using TDD, as far as I know

- Never tried it

- Stereotypes like: time expensive

- Routine

- No need

How to break down the barriers

- Try it.

- Pair programming

TDD and Test Coverage

Drop Test Coverage Metrics, they are useless. Test Coverage Metrics are to avoid, they costs productivity.

A major misunderstanding is the believe that a high test coverage is a software quality criteria. That is false. But what is true a TDD project have a high quality and have a high test coverage. Don’t mix-up causality and correlation.

Last Words

TDD is a blend of test first, decomposition pattern and iterative software development. Try it.