Testing what a Ruby process writes to STDOUT. Ruby’s relationship with STDOUT Ruby has two built-in values that represent the system’s standard output stream: The constant STDOUT The global variable $stdout The Ruby documentation, describes STDOUT as the standard output, and $stdout and the current standard output. If you want to change the stream that this Ruby process sends its output to, you can change the value of $stdout Hello StringIO Given an RSpec test pack, I should be able to use an output matcher, but I couldn’t get this to reliably work across tests for my system....

Introduction Dead letter queues (DLQ) are often used to catch items that have not been successfully processed or delivered when using queue 1 based integration patterns. Typically engineering teams will want to be alerted quickly to the presence of items on a dead letter queue so they can do something about it e.g. redrive messages back to a source queue, inspect the messages for further understanding of an issue etc....

Over the last few years we’ve invested in tooling and processes that make heavy use of JSON Schema. What is JSON Schema? JSON Schema is a standard vocabulary that allows developers to describe data formats. At the DVLA we use these definitions in various ways e.g. to generate human friendly documentation, to generate code based on the models, to describe parts of our API interfaces and to validate data objects....