Jasmine has long standing support for writing asynchronous specs. In days gone by we used the done callback to achieve this, but these days it is possible to write much...
...more readable specs. Async specs As a first example, say we want to check that some form disables the submit button while working. // bad (how we used to do it...
...default it allows only accessing visible elements -- when you are using a driver that supports it (e.g. Selenium, not the default Rack::Test driver). Consider the following HTML: One
...true) or find(..., visible: :visible). Note that you could change the default behavior by setting the ignore_hidden_elements config option. However, ignoring invisible elements is a useful default.
...just barely wider than the container it should fit into, and it wraps a single word to a new line and it's not really pretty? Cry no more, for...
...in some browsers. When browsers encounter a text-wrapping element with text-wrap: balance style, they will try breaking to a new line sooner, if it balances out the width...
...core and available in all ruby versions without the need to install anything. This serializes complete ruby objects including id, object_id and all internal state. Marshal.load deserializes a string...
...to an object. A deserialized object cannot be saved to database directly as the the dumped object was not marked dirty, thus rails does not see the need to save...
GoodJob and ActiveJob rescue exceptions internally, preventing exception_notification from triggering. This can cause silent job failures.To get notified, subscribe to ActiveJob events and configure GoodJob's on_thread_error...
...job failures, as they are handled internally by ActiveJob/GoodJob. ActiveSupport::Notifications.subscribe(/(enqueue_retry|retry_stopped|discard)\.active_job/) do |event_name, *, payload| exception = payload[:error] job = payload[:job]
...have 2 HTML boxes. The first one has a margin-bottom of let's say 30px and the second one a margin-top of 20px. After rules of collapsing margins...
...too. For example child elements with margins also collapse with margins of the previous sibling of the parent box. Nevertheless there are some exceptions where the behavior of vertical collapsing...
We're always striving towards keeping our website's JavaScript as small as possible. If you're using webpack(er), you can use the webpack-bundle-analyzer plugin to get...
...a good overview, which of your JavaScript modules take up how much space, and where you can optimize. To use it, add it via npm or yarn yarn add webpack...
...bug) and want to use git bisect to find out when it was introduced? Smart kid. If you have a shell command ready to reveal if your current state is...
...other hand will use the return value of that call to decide if the state is good or bad. First, start bisecting git bisect start Then tell git which revisions...
...the commit which was deployed. If you want to know the currently deployed release, simply SSH to a server and view that file. $ cat /var/www/my-project/current/REVISION cf8734ece3938fc67262ad5e0d4336f820689307 Capistrano task
...application is deployed to multiple servers, you probably want to see a result for all of them. Here is a Capistrano task that checks all servers with the :app role...
You can do so much more than console.log(...)! See the attached link for a great breakdown of what the developer console can give you. Some of my favorites: console.log takes...
E.g. console.log("Current string:", string, "Current number:", 12) Your output can have hyperlinks to Javascript objects E.g. console.log("Check out the current %o, it's great", location)
Capybara-screenshot can automatically save screenshots and the HTML for failed Capybara tests in Cucumber, RSpec or Minitest. Requires Capybara-Webkit, Selenium or poltergeist for making screenshots. Screenshots are saved...
...into $APPLICATION_ROOT/tmp/capybara. Manually saving a page Additionally you can trigger the same behavior manually from the test using Capybara::Session#save_and_open_page and Capybara::Session#save_screenshot...
Geordi provides a pretty neat way to generate beautiful commit messages according to your stories in Linear: geordi commit Geordi reads from a .geordi.yml file inside your repo and connects...
...to Linear to list started and finished stories with their title. Choosing one of them generates a commit message including id and title from Linear app and a link to...
❌ Bad example Let's take a look at a common example: Clear Search The HTML above is being activated with an Unpoly compiler like this: up.compiler('[filter]', function...
...const queryInput = filterForm.querySelector('[filter--query]') function resetQuery() { queryInput.value = '' queryInput.focus() } up.on('click', resetQuery) }) The Clear search button has three issues: It cannot be focused with the keyboard It cannot be pressed...
Element finding is a central feature of Capybara. Since #find is normally used to get elements from the current page and interact with them, it's a good thing that...
...some Capybara drivers (e.g. Selenium) will wait an amount of time until the expected element shows up. But if Capybara cannot #find it at all, you'll get an error...
If the project you're working on has, say, 39 repositories and counting in GitLab and you need all the repos checked out for some reason, here's how to...
...a personal access token for GitLab that has the API permissions. In your terminal, store this key in an env variable. For each group you want to check out:
Let's say you have a gem which has the following module: module SuperClient def self.foo 'Foo' end def bar 'Bar' end end For reasons you need to override foo...
...library extensions). Try to avoid it if possible. Add a lib/ext/super_client.rb to your project (see How to organize monkey patches in Ruby on Rails projects) Add the extension, which overrides...
Sometimes you need to remove high Unicode characters from a string, so all characters have a code point between 0 and 127. The remaining 7-bit-encoded characters ("Low-ASCII...
...can be transported in most strings where escaping is impossible or would be visually jarrring. Note that transliteration this will change the string. If you need to preserve the exact...
When your Rails application server raises error, Capybara will fail your test when it clears the session after the last step. The effect is a test that passes all steps...
...behavior will help you to detect and fix errors in your application code. However, sometimes your application will explode with an error outside your control. Two examples: A JavaScript library...
...is just awesome. Install via apt-get or brew. Handy commands t ("tree"): Directory-structure based access. You'll see the current directory annotated with the latest change date and...
...date and author. d ("diff"): Like ENTER on a commit, but arrow keys will scroll the diff! /: Search current view (e.g. commit list, diff). Jump to next hit with n...
It might sometimes be useful to check whether your Rails application accesses the file system unnecessarily, for example if your file system access is slow because it goes over the...
...or modification times, whereas your application could determine all this from your database. Introducing strace One option it to use strace for this, which logs all system calls performed by...
Sometimes you might want to check a short link for it's destination before clicking on it. Additional you get information about the redirects. Use the magic + at the end...
...of the short url! Google: https://goo.gl/TXe0Kx => https://goo.gl/TXe0Kx+ Since the original publication of this post, Google's URL shortening service goo.gl has been discontinued. Bitly:
CarrierWave comes with some RSpec matchers which will make testing more comfortable. Let's say you have an Uploader like this: class MyUploader < CarrierWave::Uploader::Base include CarrierWave::MiniMagick
...different versions of your uploaded files: version :small do process resize_to_fill: [100, 100] end version :medium do process resize_to_fit: [200, nil] end version :large do
...or ::1 (IPv6) can only be reached from your own PC: Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port Process tcp LISTEN...
...address 0.0.0.0 can be reached from other PCs on your network: Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port Process tcp LISTEN...
Using rem only ever makes sense when the root font size is dynamic, i.e. you leave control to the user. Either by a) respecting their user agent defaults, or...
...by b) offering multiple root font sizes in your application. By defining @media queries in rem, they will accommodate to the root font size of your page. At a larger...