How do I access a VStack while UI testing my SwiftUI app

Question

I have a VStack with code relying on the .onTapGesture method. Something like this:

VStack {
    if imageShow {
        Image("image1")
    }
    else {
        Image("image2")
    }
}
.onTapGesture {
    imageShow.toggle()
}

I'd like to test this behavior within a UI Test using XCTest. The problem is, I don't know how to access the VStack in order to apply a .tap() to it. I can't seem to find the method attached to app. A button is found using app.buttons[] but there doesn't seem to be an equivalent for app.VStack or app.HStack.

Also, I've tried converting this code to wrap the VStack in a Button, but for some reason, this overlays my image, distorting the preferred behavior.

Updating with full VStack code snippet that I am working with:

VStack(alignment: .leading, spacing: 0) {
    ZStack {
        if self.create_event_vm.everyone_toggle == true {
            Image("loginBackground")
                .resizable()
                .accessibility(identifier: "everyone_toggle_background")
            }
        HStack {
            VStack(alignment: .leading, spacing: 0) {
                Text("Visible to everyone on Hithr")
                    .kerning(0.8)
                    .scaledFont(name: "Gotham Medium", size: 18)                                          .foregroundColor(self.create_event_vm.everyone_toggle ? Color.white : Color.black)
                    .frame(alignment: .leading)

                    Text("Public event")
                        .kerning(0.5)
                        .scaledFont(name: "Gotham Light", size: 16)
                                    .foregroundColor(self.create_event_vm.everyone_toggle ? Color.white : Color.black)
                        .frame(alignment: .leading)
                    }
                    .padding(.leading)
                    Spacer()
                }
            }
        }
        .frame(maxWidth: .infinity, maxHeight: 74)
        .onTapGesture {
            self.create_event_vm.everyone_toggle.toggle()
        }
        .accessibility(identifier: "public_event_toggle")
        .accessibility(addTraits: .isButton)

Answer 1

Try the following approach

VStack {
    if imageShow {
        Image("image1")
    }
    else {
        Image("image2")
    }
}
.onTapGesture {
    imageShow.toggle()
}
.accessibility(addTraits: .isButton)
.accessibility(identifier: "customButton")

and test

XCTAssertTrue(app.buttons["customButton"].exists)

Answer 2

The solution for me was to create an un-styled GroupBox to "wrap" any content inside.
After that we can assign an accessibilityIdentifier to it.
It doesn't disrupt the screen readers or change the layout.

Code:

/// Groupbox "no-op" container style without label
/// to combine the elements for accessibilityId
struct ContainerGroupBoxStyle: GroupBoxStyle {
    func makeBody(configuration: Configuration) -> some View {
        configuration.content
    }
}

extension GroupBoxStyle where Self == ContainerGroupBoxStyle {
    static var contain: Self { Self() }
}

extension View {
    /// This method wraps the view inside a GroupBox
    /// and adds accessibilityIdentifier to it
    func groupBoxAccessibilityIdentifier(_ identifier: String) -> some View {
        GroupBox {
            self
        }
        .groupBoxStyle(.contain)
        .accessibilityIdentifier(identifier)
    }
}

Usage:

struct TestView: View {
    var body: some View {
        HStack {
            Image(systemName: "person")
            TextField("Name", text: .constant("Name"))
        }
        .padding()
        .onTapGesture {
            print("Stack Tap")
        }
        .groupBoxAccessibilityIdentifier("NAME_TEXTFIELD")
    }
}

Locating in XCTest:

app.descendants(matching: .any)["NAME_TEXTFIELD"]
// OR
app.otherElements["NAME_TEXTFIELD"]

Note: GroupBox is unavailable in tvOS and watchOS.

Answer 3

I find that otherElements["x"] doesn't work for ZStack, VStack or HStack. Instead I identify something else, like a Text, and try to get using staticTexts["x"].