Annotate ApplicationContextAssert methods with @CheckReturnValue

[scordio]

See #32683.

[snicoll]

See #32683 (comment)

[scordio]

As I need to extend Checkstyle's import-control.xml, would it be fine to add a top-level allow statement close to:

spring-boot/config/checkstyle/import-control.xml

Line 6 in a176849

<allow class="org.springframework.lang.Contract" />

or should I define a more fine-grained rule, restricting it to the following packages?

• org.springframework.boot.test.context.assertj
• org.springframework.boot.test.json

[snicoll]

would it be fine to add a top-level allow statement close to

Yep. The intention is to restrict only to certain AssertJ entry point and this is one of them so I think that's ok.