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Playwright meets JUnit 5

2023-02-22T21:56:00.002+01:00

Playwright is a Node.js-based tool for automating browsers. It supports all modern rendering engines including Chromium, WebKit and Firefox. Playwright can be used with JavaScript, TypeScript, Python, .NET and Java. In this tutorial, we will explore the setup of a test automation project using Playwright for Java, JUnit 5 and Gradle. You will also learn some basics of Playwright tools like codegen, Playwright Inspector and trace viewer. I will also provide some basic setup for Docker as well as GitHub Actions. Let's get started!

Starter template for prototyping and building CLI tools with Node.js and TypeScript

2023-02-08T23:27:00.004+01:00

macOS: Insert current date shortcut with `Shortcuts.app`

2023-02-02T01:36:00.007+01:00

Shortcuts.app in macOS is a tool for automating repetitive tasks. It has a user-friendly drag-and-drop interface and supports tasks such as opening apps, copying/pasting text, and sending messages. In this article, I'll demonstrate how to create a shortcut that inserts the current date into any app, which I use to quickly add dates to my notes, emails or Slack messages.

Frontend code analysis with SonarQube

2023-01-09T19:49:00.008+01:00

SonarQube is an open-source tool for continuous code quality inspection that analyzes code for defects, vulnerabilities, and code smells. It helps developers and teams to improve the quality of their code by identifying problems early in the development process and providing actionable feedback to fix them.

Manage multiple Java SDKs with asdf with ease

2023-01-01T23:58:00.004+01:00

asdf is a helpful command-line tool that allows you to manage and switch between different versions of programming language runtimes including Java, Kotlin, Node.js, Python and their associated packages and libraries including Gradle, Maven, Yarn, Spring Boot CLI.

Parameterized tests in JavaScript with Jest

2021-12-05T14:01:00.006+01:00

Parameterized tests are used to test the same code under different conditions. One can set up a test method that retrieves data from a data source. This data source can be a collection of objects, external file or maybe even a database. The general idea is to make it easy to test different conditions with the same test method to avoid duplication and make the code easier to read and maintain.

Jest has a built-in support for tests parameterized with data table that can be provided either by an array of arrays or as tagged template literal.

Testing promise rejection in JavaScript with Jest

2021-11-19T20:42:00.004+01:00

Testing exceptions in JavaScript with Jest

2021-11-19T10:55:00.019+01:00

Getting started with Github Actions: Run JUnit 5 tests in a Java project with Maven

2020-06-17T12:34:00.003+02:00

Github Actions is a CI/CD service provided by Github and it is free for public repositories. For private repositories, each GitHub account receives a certain amount of free minutes and storage, depending on the product used with the account.

In this blog post, you will learn how to create a simple workflow for running JUnit 5 tests in a Maven based Java project and how to add a build status badge to a README.md file.

macOS - Notes app tips that may improve your daily workflow

2020-05-19T21:55:00.002+02:00

After switching from Windows to macOS in 2019 I also changed my default note taking app from OneNote to macOS built-in Notes.app. I wasn't sure this is the right move, so I switched gradually with carefully selected topics only. But after several weeks of using both OneNote and Notes app I switched fully and after using Notes for several months now I would like to share some of my tips I find useful in my daily workflow.

Note: This blog post is focused on macOS version of the app as I use it most of the time.

Convert time unit to duration in Java

2020-05-16T17:30:00.000+02:00

java.util.concurrent.TimeUnit represents time durations in Java at a given unit of granularity and provides utility methods to convert across units. java.util.concurrent.TimeUnit was introduced back in the old Java days (1.5) but since then it has been extended several times already. In this blog post you will learn how to use java.util.concurrent.TimeUnit to convert a given time unit to a duration .

Switch as an expression in Java with Lambda-like syntax

2020-05-14T21:28:00.000+02:00

As of Java 14, the switch expression has an additional Lambda-like (case ... -> labels) syntax and it can be used not only as a statement, but also as an expression that evaluates to a single value.

Record type in Java

2020-05-13T22:21:00.001+02:00

JDK 14, released in March 2020, introduced records (preview language feature) which provide a compact syntax for declaring classes whose main purpose is to hold data. In records, all low-level, repetitive and error-prone code is like constructors, accessor and utlity methods such as equals(), hashCode(), toString() are automatically derived based on the record’s state description.

macOS: sync files between two volumes using launchd and rsync

2020-05-06T23:54:00.002+02:00

Backing up and syncing files and directories between drives is pretty common use case for many users. In this quick tutorial you will learn how to use launchd and rsync to synchronize files between different volumnes in macOS.

Spring Boot tests with Testcontainers and PostgreSQL, MySQL or MariaDB

2020-03-30T23:40:00.000+02:00

Testcontainers is a Java library that allows integrating Docker containers in JUnit tests with ease. In a Containerized World, there is little sense to complicate the tests configuration with embedded databases and services. Instead, use run your services in Docker and let the Testcontainers manage this for you.

In this blog post you will learn how to configure Testcontainers to run PostgreSQL, MySQL and MariaDB in Spring Boot 2 integration tests.

This blog post covers:

Testcontainers configuration (via JDBC URL Scheme) for Spring Boot 2 tests with PostgreSQL, MySQL and MariaDB
Testcontainers in @DataJpaTest

Docker Compose for Spring Boot application with PostgreSQL

2020-03-23T20:38:00.000+01:00

In this blog post you will learn how to configure Spring Boot application with PostgreSQL for running with Docker Compose.

This blog post covers:

Spring Boot application Dockerfile configuration with clean separation between dependencies and resources
Docker Compose configuration for running the application with PostgreSQL

Deploy Quarkus application to AWS Elastic Beanstalk

2020-03-15T21:45:00.000+01:00

Elastic Beanstalk allows deploying and managing applications in the AWS Cloud without having to learn about the infrastructure that runs those applications.

With Elastic Beanstalk you can run a website, web application, or web API that serves HTTP requests but you can also run a worker applications for running long tasks. The Elastic Beanstalk supports several preconfigured platforms including Go, .NET or Java (Java 8 only) but also generic Docker platform.

You simply upload your application with AWS CLI, AWS EB CLI or with the Elastic Beanstack console, and Elastic Beanstalk automatically handles the rest.

In this blog post you will learn how to launch single container Docker environment with Quarkus based application on Elastic Beanstalk.

Quarkus tests with Testcontainers and PostgreSQL

2020-02-27T22:10:00.001+01:00

In this blog post you will learn how to configure Testcontainers to manage PostgreSQL instance in Quarkus integration tests.

Getting started with Quarkus - build PetClinic REST API

2020-02-24T23:30:00.000+01:00

Quarkus - A Kubernetes Native Java stack tailored for OpenJDK HotSpot and GraalVM, crafted from the best of breed Java libraries and standards. - is a container-first framework optimized for fast boot times and low memory consumption. The framework is build on top of many popular Java libraries and it provides support for building standard REST as well as reactive and message-driven microservices. Thanks to the fast startup times and low memory usage Quarkus can also be used to implement functions in serverless environment. Quarkus gives a lot of possibilities to develop apps faster thanks to unified configuration, amazing live reloading features and tooling support.

Learn how to get started with Quarkus and build a PetClinic REST API.

This blog post covers:

Requirements for development environment
Creating new project
Developing, building and running the application with Java 11
Datasource configuration with Postgres and Flyway
CRUD service with pagination
Creating integration tests
Live reload and debugging
Dockerizing the application (both native and non-native)
Deploying the application to Elastic Beanstalk

Set Visual Studio Code as default editor in jshell

2020-02-03T21:45:00.001+01:00

Java Shell (jshell) is an interactive tool for learning and prototyping in Java. It was introduced with Java 9 and since then I use it ocassionally either for some quick prototyping, during presentations or simply to verify new features in the Java language. Since jshell is a command line tool (with basic intellisense) editing files in jshell is not the best expierience. Fortunatelly, jshell allows changing the default editor and set it to the one of your choice, including Visual Studio Code, Atom or Sublime.

macOS: essential tools for a developer in 2024

2020-01-05T14:07:00.017+01:00

Are you considering macOS as your next operating system? Are switching from Windows to macOS? Do you want to develop in Java on macOS? Or maybe you are looking for tools to help you to be more productive?

Read about tools that are essential to me (after switching from Windows to macOS).

Manage multiple Java SDKs with SDKMAN! with ease

2020-01-05T13:57:00.002+01:00

SDKMAN! is a convenient tool for managing parallel versions of multiple Software Development Kits. The tool is especially useful for Java developers as it supports SDKs for the JVM such as Java, Groovy, Scala, Kotlin and Ceylon. Gradle, Maven, Spring Boot and many others are also supported.

JUnit 5 and Selenium - improving project configuration

2019-12-03T22:30:00.001+01:00

Selenium is a set of tools and libraries supporting browser automation and it is mainly used for web applications testing. One of the Selenium's components is a Selenium WebDriver that provides client library, the JSON wire protocol (protocol to communicate with the browser drivers) and browser drivers. One of the main advantages of Selenium WebDriver is that it supported by all major programming languages and it can run on all major operating systems.

In this part of the JUnit 5 with Selenium WebDriver - Tutorial you will learn about additional capabilities of JUnit 5 that will help you in decreasing the execution time of your tests by running tests in parallel, configuring the order of your tests and creating parameterized tests.

You will also learn how to take advantage of Selenium Jupiter features like tests execution configuration through system properties, single browser session tests to speed up tests execution or screenshots taking in your tests. Finally, you will learn how to add AssertJ library to your project.

macOS: Preview source code files in Finder with Quick Look plugins

2019-10-12T10:44:00.000+02:00

macOS Finder offers a possibility to preview the files of any type without opening them with Quick Look. By default Quick Look supports most commonly used file formats which may not be enough if you are a developer and you want to preview source code files i.e. Java or Python or any other un-common file types.

JUnit 5 and Selenium - Using Selenium built-in `PageFactory` to implement Page Object Pattern

2019-10-08T22:19:00.003+02:00

In this part of the JUnit 5 with Selenium WebDriver - Tutorial I will go though the implementation of Page Object pattern with Selenium's built-in PageFactory support class. PageFactory provides mechanism to initialize any Page Object that declares WebElement or List<WebElement> fields annotated with @FindBy annotation.