Luís Soares – Medium

Published in CodeX

·Jun 16

Accepting a payment using Stripe (Kotlin/Javalin)

Stripe is a cloud-based service that enables charging customers for your products or services. With Stripe API, you don’t manage sensitive information like credit cards. Let’s learn how to use it. — 1. Setup Register a Stripe account if you don’t own one. Create a new Kotlin project. 2. Web handlers Add Javalin (web framework) and Stripe client to your build.gradle.kts dependencies: implementation(“com.stripe:stripe-java:20.+”) implementation(“org.slf4j:slf4j-simple:1.+”) implementation(“io.javalin:javalin:4.+”)

Stripe

3 min read

Published in CodeX

·Jun 13

Python beginner gotchas

I’ve been using Python for a year in production apps. This is the list of things that made that path harder. — This is not a language-bashing article but rather a heads-up regarding some issues that may surprise newcomers like me. The issues range from small inconveniences to questionable design decisions. Be aware this is written from the perspective of a one-year-old learner coming from other languages while keeping an open mind…

Python

7 min read

Published in CodeX

·Jun 3

Dependency Injection — Back to the Basics

DI ensures that components have their dependencies available without knowing having to create them. A dependency is another component that focuses on a specific need (e.g. database, third-party API, clock, etc.). — Why do I need DI? DI enables the easy replaceability of dependencies — these should behave as plugins. Here’s why that matters: In testing, you can easily inject test doubles thus granting determinism;

Dependency Injection

5 min read

Published in CodeX

·May 31

Dependency Injection Bad Practices

Let’s cover some common DI antipatterns. — Before moving on, make sure you read the basics: Dependency Injection — Back to the Basics DI ensures that components have their dependencies available without knowing anything about their creation. A…medium.com Monkey patching This is by far the worst antipattern. To be fair, it’s not a DI antipattern because you’re not using it. This mistake is more common in interpreted languages.

Dependency Injection

4 min read

Published in CodeX

·May 19

Creating a Slack bot (Kotlin) and deploying it in Heroku

This is the minimum needed to create and deploy an app that replies to Slack commands. — 1. Init project Create a new Kotlin project. If you haven’t yet made git init, you should do it now. Heroku needs Git so that you can easily push to deploy to Heroku. Make sure you have a .gitignore file at the root with: /.gradle /.idea /build 2. Heroku app We need to create a Heroku…

Slack

3 min read

May 15

Kotlin/Gradle/JUnit starter project

Just a quick tutorial to start a blank new Kotlin project using Gradle. Optionally, JUnit can also be added. — 1. Create a project Download and install IntelliJ Community, free for Java/Kotlin projects. Alternatively, you can use IntelliJ Ultimate EAP (if available, no subscription is required). Go to “File” ⇀ “New project”. In the wizard: ⦿ Write a Name and pick a Location; ⦿ Activate “Create Git repository”; ⦿ Language: “Kotlin”; ⦿ Build system: “Gradle”; ⦿ JDK: Pick any…

Kotlin

2 min read

Published in CodeX

·May 2

Values of a software development team

I decided to write down the values that I cherish in the form of a manifesto. Hopefully, they can impact the success and happiness of your dev team. — User-centered We don’t want to build technology for the sake of itself. Our main drive is to bring value to the user, so we avoid technical “stories”. No internal stakeholders are telling us what the users want nor are we simply executing prescribed solutions. Instead, we, as a team, investigate each…

Continuous Improvement

4 min read

Published in CodeX

·Apr 11

Splitting user stories

“Many stories are not splittable” is the typical reaction I get when proposing to split stories into smaller stories with value. However, more often than not, stories can be split further. — User stories Before starting, we need to address the concept of a user story (as originally considered by XP). A user story is not a task, a spec, or a requirement. It’s not something dictated internally. It’s not a solution as it doesn’t prescribe anything; it’s up to the team to decide…

Agile

12 min read

Published in CodeX

·Mar 30

End-to-end testing with Cypress, Testing Library

Here’s the minimum you should know if you want to test web UIs with Cypress (an alternative to Selenium), a Node-based approach. — 1. New project In a new folder, run npm init and follow the steps (simply press Enter when in doubt). My advice is to start a new git repository (git init) so you can always undo it if needed. Each step is a good moment to run a git commit. Start with this…

Automation Testing

2 min read

End-to-end testing with Cypress, Testing Library

Published in CodeX

·Mar 20

End-to-end testing with Selenium, Gradle, JUnit

I wanted to test a web page using JVM, but there are scattered tutorials everywhere. I decided to create a barebones project to illustrate how. — Our goal will be to test the end-to-end flow of adding a Kindle to the cart on Amazon.com. 1. New project Follow the steps at: Kotlin/Gradle/JUnit starter project Just a quick tutorial to start a black new Kotlin project using Gradle and Junit.lsoares.medium.com

End To End Testing

2 min read