IntelliJ IDEA 2022.3 support

Diffblue Cover now supports IntelliJ IDEA 2022.3 (Community and Ultimate). In keeping with our policy of supporting the current and previous release, Diffblue Cover now supports IntelliJ IDEA 2022.3 and 2022.2. Support for IntelliJ IDEA 2022.1 has been removed as of Diffblue Cover 2022.12.01.

New Diffblue Cover features

Four new features - Reports, Optimize, Refactor and Replay - have been added in this release of Diffblue Cover. In addition to autonomously writing and maintaining entire unit test suites without developer intervention, Cover Enterprise Edition now enables you to:

  • Automatically refactor Java code to improve testability

  • Slash the time and cost to run tests in Continuous Integration

  • Understand test coverage and code risk across your organization

  • Automatically shift complex functional tests left into unit test suites

Read this blog post or watch this short YouTube playlist to learn more about the new features. Then if you're interested in how the power of Enterprise Edition could help your team, get in touch via our website.

Developer Edition trial available

We are delighted to now offer a 14-day trial version of our Developer Edition, which includes the Diffblue Cover CLI, as part of our new licensing option. We're really excited that you can now "try before you buy"! To download your trial of Diffblue Cover Developer Edition, please click here. Full information on all our options is also available here.

How do I automatically maintain all of these tests?

Use Diffblue Cover on any CI platform to automatically update your unit tests and catch regressions for every commit - watch this video to learn more.


  • CLI: Cover now includes a summary table of environment checks in the user and support log files. [Ref: TG-18202]

  • Reports: Improved UI responsiveness and usability. [Ref: TG-18170]

  • IntelliJ Plugin: Cover now supports IntelliJ IDEA Community Edition 2022.3 and IntelliJ IDEA Ultimate 2022.3. [Ref: TG-18092]

Resolved Issues

  • IntelliJ Plugin: Resolved an issue, which, in some circumstances, caused Cover to report License unavailable. Cause: java.lang.NoClassDefFoundError [...] rather than providing remediation advice. [Ref: TG-17770]

  • Resolved an issue which, in some circumstances, caused Cover to use unnecessary local variables in written tests. [Ref: TG-18215]

  • Resolved an issue which caused Cover to not write tests for methods that return objects which can only be observed indirectly. Cover now writes assertions using indirect observers when no getter is available. [Ref: TG-17589]

  • Resolved an issue which caused Cover to not write a partial Spring test when it cannot produce a complete Spring test. [Ref: TG-17394]

Known Issues

  • Cover may produce tests for JUnit 4.10 and lower that do not compile due to the use of assertNotEquals. [Ref: TG-17605]

  • IntelliJ Plugin: Upgrading to IntelliJ IDEA 2022.3 may, in some circumstances, cause existing run configurations to no longer produce tests. Removing any run configurations for that entity and writing tests again will recreate a working run configuration. [Ref: TG-18282]

  • Reports: Firefox users may encounter It seems like we encountered an error. Try refreshing this page or contact your administrator. while loading Coverage Reports. [Ref: TG-18257]

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