Two `host` urls - Production & Test

In default json response (for example here) its json data has:

{
    swagger: "2.0",
    info: {
        title: "...",
        termsOfService": "..."
    },
    host": "https://api-adapter.backend.currency.com/ ]\n[ Base demo URL: http://demo-api-adapter.backend.currency.com",

as you see, the host key has incorrect value, because I suppose there was no way otherwise for author, to set them both. So, I suggest there was (in addition to host) another key , i.e. host-test (or whatever). because there are many services which has production & test(demo) hosts separated, with same API scheme.

Start with the linked default JSON response and inspect how Swagger UI interprets the current host value. Determine whether a separate production/test host representation is supported by the relevant API format, then verify that both URLs are represented without corrupting the default response.