Nesting POMs for things like tabs

nestedPom.swift

import XCTest

class tab1POM {
  let app: XCUIApplication
  
  init(app: XCUIApplication) {
    self.app = app
  }
  
  func pressTheButton() {
    self.app.buttons["Button on first tab"].tap()
    XCTAssertTrue(app.staticTexts["Button pressed"].exists)
  }
}

class tab2POM {
  let app: XCUIApplication
  
  init(app: XCUIApplication) {
    self.app = app
  }
  
  func pressTheButton() {
    self.app.buttons["Button on second tab"].tap()
    XCTAssertTrue(app.staticTexts["Button pressed"].exists)
  }
}

class ExamplePOM {
  let app: XCUIApplication
  let tab1Pom: Tab1POM
  let tab2Pom: Tab2POM
  
  init(app: XCUIApplication) {
    self.app = app
    self.tab1Pom = Tab1POM(app: app)
    self.tab2Pom = Tab2POM(app: app)
  }
  
  func pressTheButtonOnFirstTab() {
    self.app.buttons["Tab 1"].tap()
    self.tab1Pom.pressTheButton()
  }
  
  func pressTheButtonOnSecondTab() {
    self.app.buttons["Tab 2"].tap()
    self.tab1Pom.pressTheButton()
  }
}

final class ATest: XCTestCase {
  var app: XCUIApplication!
  var examplePom: ExamplePOM!
  
  override func setUpWithError() throws {
    continueAfterFailure = false
    app = XCUIApplication()
    app.launch()
    examplePom = ExamplePOM(app: app)
  }
  
  @MainActor
  func testAThing() {
    examplePom.pressTheButtonOnFirstTab()
  }
}