Add support for configuring `SslInfo` in `WebTestClient`

[rwinch]

I would like to be able to use WebTestClient to test applications that use SslInfo without the need to use an HTTP connection (e.g. use WebTestClient.bindToApplicationContext(ApplicationContext)).

Right now the only way I can do this is to provide a custom WebTestClientConfigurer that mutates the ServerHttpRequest. I thought about providing this in Spring Security, but since there are no Spring Security dependencies, I think that it makes more sense in Spring Framework.

[sbrannen]

Are you envisioning something like the following, where mockSslInfo() would be a static import for a method that returns a WebTestClientConfigurer?

client = WebTestClient
           .bindToApplicationContext(context)
           .build()
           .mutateWith(mockSslInfo());

[rwinch]

Thanks for the response @sbrannen

Yes. I was imagining Spring Framework would provide a WebTestClientConfigurer implementation that allowed replacing the SslInfo. However, I didn't want to be prescriptive on how Spring Framework solved this.