add testServerFactory method in BaseOneServer traits

[xuwei-k]

playframework DefaultTestServerFactory set sslPort = Some(0) by default.

https://github.com/playframework/playframework/blob/bf0458232c1f0c98e06c2cba48f1cffca0e7df43/testkit/play-test/src/main/scala/play/api/test/TestServerFactory.scala#L64

but enable ssl and SelfSignedSSLEngineProvider cause IllegalAccessError or NoSuchMethodError

https://github.com/playframework/playframework/blob/bf0458232c1f0c98e06c2cba48f1cffca0e7df43/testkit/play-test/src/main/scala/play/api/test/TestServerFactory.scala#L69

• JDK 17 IllegalAccessError because Play listens to https port in tests playframework#11209

I think scalatestplus-play should provide more convenience way for override enable/disable ssl settings.

[mkurz]

Thanks, will take a look later. This port thing needs a bit more attention from my side, I don't want to blindly merge this.

[mkurz]

The problem you solve here is now solved by Play itself already by disabling the https port by default.
Please check out xuwei-k/playframework-jdk-20#1 where I fixed your example, it's working now.

Anyway, I adjusted this pull request, so devs are still able to override the TestFactory, it might help in other situations.