> 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/2024-04-01.md).

# 2024-04-01

This release introduces support for Spring WebFlux, a popular framework for reactive programming in Java. Diffblue Cover can now write tests for `reactive-stack` Spring web projects. Tests are written following Spring's best practices, using `WebTestClient`, applying the `@WebFluxTest` annotation to auto-configure the Spring WebFlux infrastructure, and asserting on reactive stream objects (`Mono` and `Flux`).

## Enhancements

* Cover now writes tests using the `eq()` argument matcher for both boxed primitives (e.g., `Integer`, `Long`) and unboxed primitives (e.g., `int`, `long`) in Mockito `verify()` statements. \[Ref: TG-21084]
* CLI: Cover now shows the coverage given by manual (non-Diffblue) and Diffblue tests when running `coverage-reports` command or `create` with `--coverage-reports` option. \[Ref: TG-21081]
* CLI & Reports: Cover CLI now supports overriding the project name and location of reports within the Reports organizational structure using the `--location` and `--project-name` options. \[Ref: TG-21019]
* Cover now checks compatibility between the versions of the `javax.servlet` (or `jakarta.servlet`) API and the Spring Core framework being used. If incompatible versions are found, Cover will report `E107` (Incompatible Spring dependency). \[Ref: TG-20958]
* Plugin: Cover's License Details window now shows the email address used to verify the active Community Edition license. \[Ref: TG-20940]
* Cover now writes tests which assert on responses from Reactive controllers using `expectStatus`, `expectHeader` and `expectBody`. \[Ref: TG-20853]

## Resolved Issues

* Resolved an issue which, in some circumstances, caused Cover to report `spring-boot-starter-webflux` as a missing dependency despite the project not containing Reactive controllers. \[Ref: TG-21129]
* Reports: Resolved an issue which, in some circumstances, caused tables to duplicate rows after changing the sorting order via column headings. \[Ref: TG-21068]
* Reports: Resolved an issue which, in some circumstances, caused `<root>` to be shown in the recent projects list \[Ref: TG-21061]
* Reports: Resolved an issue which, in some circumstances, caused an error to be displayed after navigating to the home screen while the coverage details tab is open. \[Ref: TG-21060]
* Reports: Resolved an issue which caused deleted projects to be visible in the recent projects list. \[Ref: TG-21025]
* CLI: Cover's environment summary output now reports `Warning`, rather than `Success`, for the 'Test Validation' row when Test Validation has been disabled by the user. \[Ref: TG-20857]
* Resolved an issue which caused Cover to, in some circumstances, discard tests written for methods which spawn threads. Cover now reports `R011` (Sandboxing policy violation) when encountering methods which provoke sandboxing policy violations in a thread. \[Ref: TG-20525]

## Known Issues

* Plugin: Cover Plugin incorrectly provides a menu option to write tests for a test file. \[Ref: TG-17163]
* Cover: Diffblue 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]
* Plugin: Under some circumstances, when writing Java tests for Kotlin code, Cover may produce non-compiling tests. \[Ref: TG-20759]