Some months ago I gave my first talk: “An Introduction to TDD”. I started it telling about my personal motivation of adopting this practice daily. Therefor I cited how the development process is a waste of time when we don’t have something helping us to focus on the requirements or guiding us to the next step. I cited also how developers put too much effort trying to predict all possibles scenarios from inside to outside.
After that I basically presented the feedback cycle with the three famous steps, explained the concerns behind each of those steps and introduced to the existing levels of tests in order to be able to show a sample code which illustrates how TDD can work on real. At the end I mentioned some good practices like AAA and FIRST that are helpful to improve both legibility and quality of the tests.
The goal of the talk was to give an introduction to the basics elements that a developer needs to write test first and an overview how the tests should guide the development process. However those who were interested on the subject, would still need to go deeper by theirselves.
A good summary: no waste, no effort on useless stuff, no “what if this happens? Or what if that happens?”… TDD gives us the opportunity to focus on the required business behaviors and just solve the problems.
I like to say that TDD is straight to the point.
At the end what surprised me weren’t some questions and the positive feedback, rather some developers that started to put on balance time versus results, saying that TDD is an unreachable ideal and just a philosophical subject…
I was there asking myself: why would they be feeling so attacked if I haven’t even said that TDD is a must?
Since then I’ve been thinking about what happened and here I answer with almost the same arguments used on my last post: we have to be aware of our professional attitude and of the consequences of our work.
Just complaining is the real waste of time.
We have to face the truth and realise that if we aren’t writing tests today, we and others are going to have a lot of problems tomorrow. We also need to study to be able to delivery the better code as possible… I ensure that tests first is a good starting point to learn a lot.
Anyway, the main concern remains: TDD is really hard to adopt 100%.
Yes, I know that and I don’t believe everybody will start applying it perfectly overnight. Testing in the right way can be really challenging even for the most experienced developers, because you need not just to have a good understanding of Dependency Injection, Clean Code, OOP, Refactoring etc., but also to handle errors decently… the learning curve is relatively long.
However, I will also mention that TDD is a discipline.
When you start to use it, to understand it and to experience how TDD helps to develop faster and to improve code quality, writing tests first will be natural. It will be easier after each complete cycle and you will do it in a more consistent way… then suddenly TDD simply composes your development process and you finally agree TDD is the opposite of a waste of time.
I am sure you will be quickly asking yourself: Why are some developers still complaining about test first?
Uncle Bob starts the Clean Code book with:
“Writing clean code is what you must do in order to call yourself a professional. There is no reasonable excuse for doing anything less than your best.”
Sorry, but there is no excuse to skip the tests just by argumenting that TDD is a waste. At the other side are teams emailing the wrong persons while developing and spending a lot of effort to reproduce and understand bugs already in production. Those are common situations on incidents where companies simply lost millions because they couldn’t predict simple issues…
Are you still complaining? If your team is slow, you should review your processes and your application design, if it is hard to adopt TDD, you should have a plan to teach your team… skipping tests will be always the wrong choice.
Let’s analyse what Uncle Bob said during a talk at GOTO; Amsterdam (video here):
“I will provide with each release a quick, sure and repeatable proof that every element of the code works as it is supposed to (…) otherwise known as tests (…) When did we decide that it is OK if some of that code doesn’t work? [No,] it is not OK if some of that code doesn’t work. And so, we should provide proof (…) that the code works as you believe.
We are all humans. We all make mistakes (…). It is not possible to achieve perfection, but it is always an error not to try. And the idea that we will simply accept a certain level of defects is inappropriate. [It] is unethical. We can’t accept that.”
TDD can take a little more time at the beginning, but trust me it has so many benefits.
Here are great books to read:
- Jeff Langr, 2015. Pragmatic Unit Testing with JUnit in Java 8
- Nat Pryce; Steve Freeman, 2009. Growing Object-Oriented Software, Guided by Tests
- Robert C Martin, 2008. Clean Code: A Handbook of Agile Software Craftsmanship
Thanks and let’s test first!
Originally published at blog.fefas.net.
Single Responsibility Principle (or SRP) is one of the most important concepts in software development. The main idea of this concept is: all pieces of software must have only a single responsibility.