They have other tests for some other groups of people, but I think the majority of studies (at least in psychology) that deal with minorities in the US cover African Americans and Hispanics or Latinos/Latinas.
Of course minorities can have their own stereotypes, prejudices, and discriminatory behavior towards other groups. We touched on this briefly in class but it seems like there just isn't as much focus on other interactions.
There's actually a ton of interesting stuff, such as cases where individuals in a minority will appear prejudiced against their own group, something that has been attributed to preserving social norms. I don't want to discuss all of it because this isn't my social psychology class and we only spent a week covering it, so I'm far from an expert. I just thought that people may find the idea of implicit racism interesting through this test. I'd suggest that people do more research on the topic themselves, especially if they find things confusing or incorrect, as it's quite an interesting subject.
