This post was written for the Plutora blog. You can read the original here. Are you eager to deploy the next version of your software? Or are you afraid of the possible downtime during deployment? Or worse, that issues will arise and you’ll have to do a painful and complicated rollback? Then I recommend you look at blue-green deployments. Let’s look at how software is traditionally deployed, what blue-green deployments are, and how you can use them. Traditional Situation In a more “traditional”

This post was written for the Testim blog. You can read the original here. Cucumber.js and BDD aren’t new kids on the block. But they’re still fairly unfamiliar for many developers. That’s unfortunate, because the two can be very powerful tools for both the business people and developers. Let’s have a short look at what BDD is, and then see how Cucumber.js can be used to your advantage. What Is BDD? If you’re unfamiliar with BDD, don’t worry. It’s not a difficult topic.

This post was written for the Plutora blog. You can read the original here. In 2001, the Agile Manifesto surfaced. It wanted to change the software development process. The manifesto has four central themes, but not many people know that there are also 12 Agile Principles. These offer more concrete examples of how agile software development should take place. Many years later, almost every organization will say they “do agile” but many only provide lip service to the values and principles of the

This post was written for the Testim blog. You can read the original here. Looking to test your JavaScript and/or TypeScript code? Then you could do worse than go for testing with Mocha and Chai. These two libraries are among the most popular tools that developers use to write tests for JavaScript or TypeScript code. But if you’re not familiar with them yet, let me show you how easy it is to get started. Introducing Mocha Mocha is a unit testing library that

This post was written for the Testim blog. You can read the original here. There are many libraries available to write unit tests for your JavaScript code. One popular option is QUnit. Let’s look at how you can get started with QUnit. But let’s not stop there. Measuring code coverage of your tests is a useful metric to gain insights and improve your test suite. We’ll open the tutorial with a brief overview of QUnit itself, so we’re on the

Every now and then, I encounter some complex legacy code that has been moved around and changed so much, git blame doesn’t help in finding the original commit. Git bisect is the solution here. Why the Original Commit Can Help Sometimes, I read code and (after a while) it becomes clear what it does. But I’m often left wondering why the code is there, what the context was. It allows me to read the commit message and maybe several commits

While working on a legacy application for a client, I wanted to get some code coverage for my tests. In Python, this usually means running and pointing it to your unit tests. This being a legacy application, there were no unit tests. There were Postman tests however. This is a simple technique that is useful when working with legacy applications. The idea is simple: we run our application using The application is a Django application and so it

Warning: slightly cheeky post, I have the highest respect for the people behind node-gyp. They’re way smarter than me. If you’ve been working with Node for a while, surely you’ve encountered issues with node-gyp. Searching for the solution can be a frustrating experience. Things get very technical and all kinds of solutions are offered. This is what always works for me. What is node-gyp? I won’t get into the details, because I’m not really bothered with understanding it. I just

AWS CloudWatch allows you to raise alarms when certain values are above or below a given threshold. But what if you want the alarm only when it is between certain thresholds? That’s where metric math comes in. A Simple Alarm In CloudFormation, you can define an alarm quite easily: This will raise an alarm when the amount of requests per minute to the given API goes over (or is equal to) 5000. What if you want this alarm, but a

Here’s a small tip that people don’t often do enough, in my opinion. When developers create some class, variable, or other piece of code that warrants some explanation, many of them add a comment: This is fine if it helps other developers understand what is going on. But it requires them to navigate to the actual file to read the info. One step better is to make these kind of comments available to the autocomplete/Intellisense feature of your IDe/editor: Now