How to access the Scene instance of a visionOS app using immersive space in a unit test?

I have a visionOS app using immersive space with RealityView. The app adds RealityKit entities to the app's Scene instance, and uses raycast to find CollisionCastHits.
I want now to write a unit test to check if the app finds the right hits.
To do so, I have to access the Scene instance to add entities, and to check if they are hit by scene.raycast.

But how can I access the scene instance?
I can access it e.g. after creating the RealityView via its content parameter, or via @Environment(\.realityKitScene). But this seems not to be possible in a unit test.

I tried the following test function:

@MainActor @Test func test() async throws {
    var scene: RealityKit.Scene?
    await withCheckedContinuation { continuation in
        _ = RealityView(make: { content in
            print("make")
            let entity = Entity()
            content.add(entity)
            scene = entity.scene
            continuation.resume()
        })
    }
    #expect(scene != nil)       
}  

But this logs

◇ Test test() started.
SWIFT TASK CONTINUATION MISUSE: test() leaked its continuation!

The reason is apparently that the make closure of RealityView is only called when SwiftUI calls it within the body of a SwiftUI View.

So, is it possible at all to access the app's scene i a unit test?