test: test sometimes fails waiting for signed in screen so might be a fix

Author: russellwheatley

samples/swiftui/FirebaseSwiftUIExample/FirebaseSwiftUIExampleUITests/FirebaseSwiftUIExampleUITests.swift

@@ -236,6 +236,13 @@ final class FirebaseSwiftUIExampleUITests: XCTestCase {
     XCTAssertTrue(signUpButton.exists, "Sign-Up button should exist")
     signUpButton.tap()
 
+    // Wait for the auth screen to disappear (email field should no longer exist)
+    let emailFieldDisappeared = NSPredicate(format: "exists == false")
+    let expectation = XCTNSPredicateExpectation(predicate: emailFieldDisappeared, object: emailField)
+    let result = XCTWaiter().wait(for: [expectation], timeout: 10.0)
+    XCTAssertEqual(result, .completed, "Email field should disappear after sign-up")
+    
+
     // Wait for user creation and signed-in view to appear
     let signedInText = app.staticTexts["signed-in-text"]
     XCTAssertTrue(