Add an integration test to validate Reactor Netty automatic flushing [SPR-14992]

[spring-projects-issues]

Sébastien Deleuze opened SPR-14992 and commented

Currently, if no explicit flush is performed, Reactor Netty flush the data only when the input stream is complete, which may cause some issues with big streams. When this related issue will be fixed, we should add an integration test in FlushingIntegrationTests to check it behaves as expected.

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This issue is a sub-task of #19510

Referenced from: commits dfcd5b9

[spring-projects-issues]

Sébastien Deleuze commented

Fixed by this commit.