While in CSS zero is usually referenced without specifying a unit (e.g. padding: 0), you must not use a unitless...

sass >= 1.35.0 has the option quietDeps and silenceDeprecations to silence deprecation warnings from dependencies. quietDeps: No deprecation warnings for dependencies...

ActiveType::Object inherits from ActiveRecod::Base and is designed to behave like an ActiveRecord Object, just without the database...

Unpoly's [up-observe], [up-autosubmit] and [up-validate] as well as their programmatic variants up.observe() and up.autosubmit...

You can use ETags to allow clients to use cached responses, if your application would send the same contents as...

Here are a few common patterns that will probably lead to flaky specs. If you notice them in your specs...

tl;dr In RubyMine you can use find and replace with capture groups (.*?) and backreferences $1 (if you have several...

Ruby's standard library includes a class for creating temporary directories. Similar to Tempfile it creates a unique directory name...

To allow HTTP 304 responses, Rails offers the fresh_when method for controllers. The most common way is to pass...

Greg Molnar has written a neat article about creating a single-file Rails app. This is not meant for production...

You can use the code below to check whether the browser can make connections to the current site: await isOnline...

When changing code in mailers, updating the corresponding mailer preview can be forgotten very easily. Mailer previews can be tested...

Testing file download links in an end-to-end test can be painful, especially with Selenium. The attached download_helpers.rb provides...

While verifying doubles in RSpec is a good default, it is limited in the amount of methods it actually is...

There is a way to use multiple databases in Rails. You may have asked yourself how you're able to...

You can use Unpoly's up.on with a named listener function and immediately unbind this event listener with { once: true...

Due to the way we setup Jasmine tests in our projects, you may run into various errors when Jasmine boots...

When the order matters: expect(array1).toEqual(array2) Regardless of order: expect(array1).toEqual(jasmine.arrayWithExactContents(array2)) Ignoring extra elements:

Redis.current will be removed without replacement in redis-rb 5.0. Version 4.6.0 adds deprecation warnings for Redis.current and Redis.current=: `Redis.current...

While we are used to run our JavaScript tests on a test page within our Browser, it's also possible...

I recently was in a weird situation where my (Jest/CLI) tests were referencing a function that was no longer part...

RSpec's let allows you to super into "outside" definitions, in parent contexts. Example: describe '#save' do subject { described_class.new(attributes...

To ensure a consistent code style for JavaScript code, we use ESLint. The workflow is similar to integrating rubocop...

This are the steps I needed to do to add esbuild to an application that used the vanilla rails asset...