Provide MockWebServer Integration

[rwinch]

I'd like Spring Boot to provide integration with MockWebServer. For my particular case, I'd like to be able to leverage MockWebServer.url to configure environment variables for testing. For example, a user of Spring Boot's Security OAuth2 support might want to provide a value for spring.security.oauth2.resourceserver.jwt.issuer-uri that points to the MockWebServer.

One way a user might be able to integrate this is by providing a property that looks like:

spring.security.oauth2.resourceserver.jwt.issuer-uri=${mockwebserver.url}/oauth2/keys

Spring Boot could provide a hook that would change ${mockwebserver.url} into a URL created using MockWebServer.url.

A few points of consideration:

• The MockWebServer will need to be accessible to the user to add mock responses
• We need to be able to reset the MockWebServer between tests.
• User's may want to customize the MockWebServer

[philwebb]

@rwinch Do you mean this MockWebServer?

[rwinch]

@philwebb Thanks for the fast response. Yes that is what I mean.

[philwebb]

See also #5173 which relates to using wiremock.