> For the complete documentation index, see [llms.txt](https://cover-docs.diffblue.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cover-docs.diffblue.com/updates-and-upgrades/release-archive/2023-09-01.md).

# 2023-09-01

This release adds support for Spring 6 with TestNG and includes a code signing certificate update. See the full Release Notes below for details of all enhancements and resolved issues covered by this release.

## Enhancements

* CLI: Cover CLI now includes an option to exclude very large class files (`--max-class-length`). This can be useful where third party code conversion tools have generated large class files which are not idiomatic of developer written code. \[Ref: TG-19923]
* Cover: Diffblue Cover now writes assertions for arrays mutated by `System.arraycopy`. \[Ref: TG-19844]
* CLI: Multiple telemetry endpoints can now be configured for Cover CLI, including your own Mixpanel instance. \[Ref: TG-19703]
* Cover: Diffblue Cover now supports Spring 6 with TestNG. \[Ref: TG-19587]

## Resolved Issues

* Updated code signing certificate to remove expired parent certificate in chain. As the chain of trust has changed you may need to revalidate the authenticity of Diffblue Cover. \[Ref: TG-19996]
* Cover: Resolved an issue which caused Diffblue Cover to halt with "unexpected error: null" when using the `--patch-only` option with corrupt class files in the classpath. \[Ref: TG-19970]
* Plugin: Resolved an issue which, in some circumstances, caused Cover Plugin for IntelliJ to fail to write tests and log `PatchFailedException: Patch engine could not apply delta` \[Ref: TG-19905]
* Plugin: Resolved an issue which, in some circumstances, caused Cover Plugin for IntelliJ to fail to write tests and log `Syntax error on token "package", import expected` \[Ref: TG-19904]
* Cover: Resolved an issue that previously prevented Diffblue Cover from writing tests for VERY large classes. \[Ref: TG-19845]
* Cover: Resolved an issue which caused Diffblue Cover to exit with an error (E068) rather than generate a warning when classes defined in DiffblueRules.yml could not be found. \[Ref: TG-19685]
* Cover: Resolved an issue which caused Diffblue Cover to not discover all Spring profiles for a project. \[Ref: TG-19662]

## Known Issues

* Cover: Cover may produce tests for JUnit 4.10 and lower that do not compile due to the use of `assertNotEquals`. \[Ref: TG-17605]
* Cover: Diffblue Cover supports Open JDK and Oracle JDK; results with other JDKs may differ due to the variability in their implementations of Java. \[Ref: TG-19345]
* Cover: Cover may encounter an `F009: Internal error` while writing tests using Mockito 5. To avoid this issue use a version of Mockito earlier than 5. \[Ref: TG-19610]
* Cover: Diffblue Cover Plugin cannot write tests for methods which use Java 17 Records. \[Ref: TG-19937]