Diffblue

Diffblue builds software that generates regression unit tests automatically for large Java codebases. Its current product, the Diffblue Testing Agent, works through a company's existing approved AI coding tools and manages the whole test-writing job, from finding gaps in coverage to preparing a pull request. The firm pitches it at enterprises modernising legacy code and teams adopting shift-left testing.

What Diffblue offers

• Diffblue Testing Agent — orchestrates coverage analysis, build fixes, test planning, parallel test generation, verification and clean-up.
• Diffblue Cover — a tool that writes Java unit tests and keeps the suite updated as the code changes.
• Legacy code modernisation — a baseline of regression tests created in hours so older applications can be changed with less risk.
• CI pipeline integration — unit testing run as an automatic step in continuous integration.

Who it works with

The product is aimed at enterprise development teams working in Java, including those with poorly documented or thinly tested legacy systems.

Key facts

• Language supported: Java
• Experience: around ten years of test engineering workflows built into the product
• Model approach: uses the customer's existing AI coding platform rather than a new model vendor