PostgreSQL's Common Table Expressions (CTEs) can be used to extract sub-queries from bulky SQL statements into a temporary...

PostgreSQL supports the SQL OVERLAPS operator. You can use it to test if two date ranges overlap: => SELECT ('2001-02...

Summary: Don't add chromedriver-helper to the Gemfile the executables might break your tests in projects where chromedriver-helper...

Git has two kind of tags: annotated lightweight Annotated tags are stored as full objects in the Git database. They...

In most projects I know, Cucumber test suite speed is not an issue. Of course, running 350 features takes its...

When you're using Sidekiq::Web to monitor the Sidekiq status AND have your session cookie configured to a wildcard...

If your application exports CSV, be advised that Excel and other spreadsheet applications treat certain cells (those starting with =, +, - or...

Requestb.in is a webservice that gives you a temporary URL you can use to test request. The page will automatically...

When attempting to update RubyGems, depending on updates your previously performed, you might run into an error ERROR: While executing...

We're usually running Ubuntu LTS versions. Sometimes newer hardware requires packages from more recent Ubuntu releases that only come...

A common pattern in Ruby is to to require all files in a specific diretory, using something like Dir.glob(Rails.root.join...

Checking if a JavaScript value is of a given type can be very confusing: There are two operators typeof and...

RSpec allows you to mark a single Example/ExampleGroup so that only this will be run. This is very useful when...

If you already selected an element and want to get its parent, you can call find(:xpath, '..') on it.

If you use awesome and make a Slack call, you'll constantly have an overlay window pop up taking over...

When an Rspec example fails, I usually investigate by running that example again using rspec . However, this does not work...

You are not using javascript tests The file is served from a public folder (not via controller) Problem description...

An end-to-end test (E2E test) is a script that remote-controls a web browser with tools like Selenium...

When your public-facing application has a longer downtime for server maintenance or long migrations, it's nice to setup...

Browsers support different types of redirects. Be very careful with these status codes: 301 Moved Permanently 308 Permanent Redirect

Slides for Henning's talk on Sep 21st 2017. Understanding sync vs. async control flow Talking to synchronous (or "blocking...

If you are using PDFKit / wkhtmltopdf, you might as well want to use custom fonts in your stylesheets. Usually this...

Let's say you have a folder images and want to to move all files in there to a new...