SwiftUI and unit testing

Appologies for cross-posting but I just found the right forum to ask this question.

I am trying to write unit tests for SwiftUI views but finding zero resources on the web for how to go about that. Any pointers?

I have a view like the following

struct Page: View { 
    @EnvironmentObject var service: Service  
    var body: some View { 
        NavigationView { 
            ScrollView(.vertical) { 
                VStack { 
                    Text("Some text")) 
                        .font(.body) 
                        .navigationBarTitle(Text("Title")))  
                    Spacer(minLength: 100) 
                } 
            } 
        } 
     } 
}

I started writing a test like this

func testPage() { 
    let page = Page().environmentObject(Service()) 
    let body = page.body 
    XCTAssertNotNil(body, "Did not find body") 
}

But then how do I get the views inside the body? How do I test their properties?

As a matter of fact even this doesn't work. I am getting the following runtime exception

Thread 1: Fatal error: body() should not be called on  ModifiedContent<Page,_EnvironmentKeyWritingModifier<Optional<Service>>>.