Diffblue Cover enables Continuous Integration for Java development

Cover is available as an IntelliJ Plugin and a CLI Tool

What does Diffblue Cover do?

Diffblue Cover analyzes your existing Java program and writes unit regression tests that reflect the current behavior of the code.

When your code's behavior changes, Diffblue Cover's tests alert you.

How does it work?

Diffblue Cover is software for Linux, Windows and MacOS that runs 100% locally on your computer.

You can run it on your entire Java project, just one class, or anything in between. It gets your project structure and dependencies from Maven or Gradle. Cover supports Spring Java apps and writes tests that use standard Spring idioms and mocking.

How do I use it?

Cover is available as a CLI tool and as a plugin for IntelliJ IDEA

IntelliJ Plugin

The IntelliJ IDEA Plugin can generate tests per method or per class within the IDE.

The plugin can be used for interactive test writing on the developer desktop, and supports test-driven development (TDD) by quickly generating unit regression tests for utility code in bulk—so you can spend your time writing testable code, and unit tests that cover the complex, critical business logic.

CLI Tool

The CLI tool works 100% autonomously, configuring itself from your Maven or Gradle environment. 

By bringing automation to the test-writing process, the CLI tool provides a speed boost for organizations that are working towards achieving DevOps goals like CI/CD. Since it fits into a CI pipeline, the CLI tool protects the whole codebase from regressions by shifting testing left.

Diffblue Cover's unit regression tests run fast and verify new code changes immediately, helping users detect undesirable changes in the code’s behavior as early as possible, when they're the quickest, easiest, and cheapest to fix. And tests are automatically maintained, saving teams even more time.

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What is Diffblue Cover?

Diffblue Cover creates suites of unit tests that run in your continuous integration pipeline between versions and protect against regressions, so you can catch errors faster and earlier in the software development lifecycle. To learn more, see our our product page.

What are the benefits of using Diffblue Cover?

Diffblue Cover helps your team increase automation of your CI pipeline.

For development teams, this:

  • improves velocity and quality of the software you deliver
  • frees up time to focus on creating new features

For DevOps teams, this:

  • helps catch errors and issues earlier (shift left!)
  • improves deployment frequency, lead time, and mean time to repair (MTTR)

Will the tests find regressions in my code?

Yes. Diffblue Cover quickly generates tests that will allow you to adopt CI. The generated tests will help developers quickly identify regressions in subsequent commits before committing new versions.

What are the requirements for running Diffblue Cover?

See the product datasheet for more information.

How can I learn more about customers using Diffblue Cover?

See our case study on how Goldman Sachs has benefited from using Diffblue Cover to increase coverage and create a safety net against regressions.

For example of other ways our customers use Diffblue Cover, click here.

How do we maintain Diffblue unit tests in the future?

Diffblue regression suites are maintained automatically and updated with each new code version to capture the current behavior of the code.

How does Diffblue Cover help me adopt Continuous Integration?

Diffblue Cover AI analyzes your code and writes Java unit tests that run in a CI pipeline after each commit. Cover’s tests:

  • Always compile
  • Run quickly
  • Detect regressions from previous versions
  • Improve coverage
  • Are easy to understand

Should our team stop writing unit tests after adopting Diffblue Cover?

No. Diffblue Cover is meant to complement your own unit tests and help you catch regressions.

How is a unit test different from a Diffblue regression suite?

Developers write individual unit tests to test specific functionality. Diffblue regression suites are generated automatically to help find regressions early in the development cycle. Find out more in our Unit Regression Tests eBook.