> If you have a isolated "API test automation team" then it sucks to be you, but the language choice would be on them, wouldn't it? I don't think that I implied otherwise.
You said the tests should be in the implementing languages
On the "sucks to be you" - I have test automation folk in the team delivering software alongside everyone else as a cross-functional team; I just used the word "team" loosely to mean "the group of people whose job it is to do certain levels of test automation".
> It was my assumption that the people writing the APIs were also writing the tests, so they would prefer the familiar language.
The point I'm making is makes sense for unit tests, semi-unit tests, and possibly also for lower-level API tests (e.g. API testing an individual service), but when you have to test functionality across services, you might well not want to pick a technology that the service(s) under test were built in.