Currently for the flutter/plugins tooling we have a command (xctest) that's specific to iOS and macOS native unit tests, and for Android you have to do the build and then gradle commands manually in the right location, which isn't ideal. We're going to be adding another build/test combination for Linux and Windows that won't be the same as either of those.

Rather than have to remember all the different platform invocations, or have different command for each test implementation, we should have a generic command (native-unit-test?) that takes platform flags, and handles all the details of the necessary build+run commands for each platform's tests.