DVLA Engineering

Welcome to the Driver and Vehicle Licencing engineering site which contains technical posts and information about our open-source projects.

Spring Security private key jwt with AWS KMS

As part of our proof of concepts in to the adoption of One Login we setup a Spring Security OAuth 2.0 demo that tested out the integration guide provided by Government Digital Service (GDS). Spring security has long had great OAuth2.0 support from both the server and client elements. Over the last year spring security added support for the private_key_jwt client authentication method as part of the authorization code grant flow....

December 5, 2023 · 4 min · 812 words · Greg Simons

Artefacts in tests and managing them with Atlas

We’ve recently publicly released a Gem called dvla-atlas1 and today we are going to take you through a bit of history surrounding testing at the DVLA that led to use developing Atlas, along with a dive into some of the code that makes it tick. Atlas is designed to make the managing of properties in functional tests easier while also ensuring that each test is run in isolation and without any cross-pollination of test data....

November 14, 2023 · 8 min · 1658 words · Nigel Brookes-Thomas & George Bell

Linux timeout command

When a drone build is configured to both deploy and then delete AWS services, it is vital the AWS clean up step runs to maintain the AWS stacks within their limit. To ensure these steps run before the build times out, you can wrap your cucumber command in the linux timeout command within the drone pipeline example: commands: - cd functional-tests || exit 1 - timeout -k 10 10m bundle exec rake test Linux Timeout The timeout command is a command-line utility that will run the specified command for a given period of time, once that period of time is reached if the given command is still running it will be terminated....

October 14, 2023 · 2 min · 331 words · Paul Lewis

The at_exit function

Traditionally, in functional testing, a clean up/tear down script would be run in something called an After hook. These hooks are part of the Cucumber DSL and are designed to execute when a scenario has finished. Cucumber example: After do |scenario| if scenario.failed? MultiLogger.clean_logs end end There is a drawback to these hooks where they will fail to run when certain exit codes are returned from the scenario or the program is interrupted....

August 23, 2023 · 2 min · 255 words · Thomas Feathers

TiL: Generating numerous FakerMaker objects in one call

Trying to generate numerous, realistic-looking objects for automation testing can be difficult. Using FakerMaker to do just that is preferable; using factories with Faker to dynamically create the test data you need in whatever format you need, is far better than using fixtures. But what if you needed more than one object of the particular factory that you have created? Creating a factory We can use Faker and FakerMaker to create an individual factory for an API request body like this:...

August 22, 2023 · 2 min · 309 words · Tomos Griffiths