adding test for phone auth sign in

Author: srushtisv

FirebaseAuth/Tests/SampleSwift/AuthenticationExampleUITests/AuthenticationExampleUITests.swift

@@ -182,6 +182,33 @@ class AuthenticationExampleUITests: XCTestCase {
     )
   }
 
+  func testPhoneAuthLoginRCEInEnforceMode() {
+    app.staticTexts["Phone Number"].tap()
+    XCTAssertTrue(app.staticTexts["Sign in using Phone Auth"].waitForExistence(timeout: 3))
+    let testPhone = "+12345678901"
+    app.textFields["Enter Phone Number"].tap()
+    app.textFields["Enter Phone Number"].typeText(testPhone)
+    app.buttons["Send Verification Code"].tap()
+    // Wait for the error message to appear (if there is an error)
+    let errorAlert = app.alerts.staticTexts["Error"]
+    let errorExists = errorAlert.waitForExistence(timeout: 5.0)
+    XCTAssertFalse(errorExists, "Error")
+    let verificationCodeInput = app.textFields["Enter verification code."]
+    XCTAssertTrue(
+      verificationCodeInput.waitForExistence(timeout: 2),
+      "OTP input should appear."
+    )
+    verificationCodeInput.tap()
+    let testVerificationCode = "123456"
+    verificationCodeInput.typeText(testVerificationCode)
+    app.buttons["Continue"].tap()
+    // Sign out
+    let signOutButton = app.buttons["Sign Out"]
+    if signOutButton.exists {
+      signOutButton.tap()
+    }
+  }
+
   func DRAFT_testGoogleSignInAndLinkAccount() {
     let interruptionMonitor = addUIInterruptionMonitor(withDescription: "Sign in with Google") {
       alert -> Bool in