`autoCloseArguments` support in `@ParameterizedTest` breaks existing tests

[sbrannen]

Overview

Having autoCloseArguments default to true is a breaking change for arguments that are shared between parameterized test invocations.

In the Spring Framework test suite, we have three @ParameterizedTest methods (in PathMatchingUrlHandlerMappingTests and ClientHttpConnectorTests) that hang indefinitely while running against JUnit 5.8 snapshots.

Declaring @ParameterizedTest(autoCloseArguments = false) solves the problem, but this is technically a regression and, more importantly, the average user will not even know where to begin debugging such failures.

Deliverables

Document that autoCloseArguments in @ParameterizedTest is a potentially breaking change in:

• Javadoc
• Release Notes
• User Guide

[marcphilipp]

Team decision: Add a note to the release notes