I recently stumbled over a problem that my feature tests broke in CI because of a mismatching chromedriver version.

In this specific project we have a fixed Chromium version in a Debian 12 environment instead of Chrome. The tests however used a recent chrome version instead.

$ chromedriver --version
ChromeDriver 117.0.5938.149 (e3344ddefa12e60436fa28c81cf207c1afb4d0a9-refs/branch-heads/5938@{#1539})
$ chromium --version
Chromium 117.0.5938.149 built on Debian 12.1, running on Debian 12.1

> WARN Selenium [:selenium_manager] The chromedriver version (117.0.5938.149) detected in PATH at /usr/bin/chromedriver
might not be compatible with the detected chrome version (119.0.6045.105);
currently, chromedriver 119.0.6045.105 is recommended for chrome 119.*, so it is advised to delete the driver in PATH and retry

It turned out that Selenium Webdriver 4 uses a binary called selenium-manager to determine the chromedriver, which probably also downloads Google Chrome for Testing Show archive.org snapshot if none is found on the system.

I worked around this behavior by setting the path to the binary in the selenium initializer

Capybara.register_driver :selenium do |app|
  additional_options = {}
  
  if gitlab_ci?
    additional_options[:binary] = `which chromium`.strip.presence
  end

  options = Selenium::WebDriver::Options.chrome(**additional_options)
end

Note

You can see the request when you turn off your network connection

WARN Selenium [:selenium_manager] Exception managing chrome: 
error sending request for url (https://googlechromelabs.github.io/chrome-for-testing/last-known-good-versions-with-downloads.json): 
error trying to connect: dns error: failed to lookup address information: Try again

selenium.dev

Florian Leinsinger

makandra.de

Say thanks

Last edit

6 months ago

Henning Koch

License

Source code in this card is licensed under the MIT License.

Async control flow in JavaScript: Promises, Microtasks, async/await

Slides for Henning's talk on Sep 21st 2017.

Understanding sync vs. async control flow

Talking to synchronous (or "blocking") API

print('script start')
html = get('/foo')
print(html)
print('s...

Delivering Carrierwave attachments to authorized users only

Preparation

To attach files to your records, you will need a new database column representing the filename of the file. To do this, add a new migration (rails g migration <name>) with the following content:

class AddAttachmentToNotes...

Posted by Florian Leinsinger to makandra dev (2023-11-03 12:50)

Heads Up: Selenium 4 uses a binary to determine the chromedriver

Note

Related cards:

Understanding sync vs. async control flow

Talking to synchronous (or "blocking") API

Preparation

Introduction

Summary