unable to overwrite springdoc.model-converters.polymorphic-converter.enabled in JUnit test

[mischa-n]

Describe the bug

If you have multiple @SpringBootTests that start a web environment, the property springdoc.model-converters.polymorphic-converter.enabled is evaluated when starting the first test and the result / the io.swagger.v3.core.converter.ModelConverters to be used are apparently cached somewhere outside the Spring application context.

If you then try to set the property to a different value in subsequent unit tests (e.g. via org.springframework.boot.test.context.SpringBootTest.properties()), this has no effect.

(@DirtiesContext and other approaches also do not work as a workaround).

To Reproduce
Steps to reproduce the behavior:

• JUnit 5.11.3
• Spring Boot 3.3.9
• springdoc 2.6.0
• Swagger 2.2.27
• Apache Maven 3.9.9
• Java 21.0.3

Expected behavior

The property springdoc.model-converters.polymorphic-converter.enabled may be overwritten in any test.