Testing #117307

So far, my understanding of vscode.TestObserver and its factory functions is that a test observer gives you access to tests, e.g it enumerates them and fires events when something changes. The usual API pattern for something like that doesn't use such an indirection but exposes things directly. So, I wonder why there isn't something like this instead

namespace test {
   const testItems: TestItem[];
   const onDidChangeTestItems: Event<TestItemChangeEvent>
}