Diffblue

AI that writes Java unit tests automatically.

Filed under: Coding

About Diffblue

Diffblue uses AI to automatically generate unit tests for Java code, producing regression suites without manual test writing. Its Cover product integrates with CI to keep coverage up as code changes. In the testing set of AI coding tools, Diffblue is the specialist for Java unit tests. Teams using GitHub Copilot add it for systematic coverage.

Key features

Autonomous Java unit tests
CI integration
Regression test suites
IntelliJ plugin
Coverage reporting
Enterprise support

Diffblue screenshots

Diffblue: pros & cons

Pros

Fully automatic test writing
Strong for Java shops
CI-native
Saves QA time

Cons

Java-focused
Paid with trial
Generated tests need curation

Diffblue FAQs

Is Diffblue free?

Diffblue offers a free trial; ongoing use requires a paid plan.

Which languages does Diffblue support?

Diffblue focuses on Java.

How does Diffblue write tests?

Its AI analyzes code behavior and generates JUnit regression tests automatically.