1. In Xcode: File → New → Target
2. Choose: UI Testing Bundle
3. Name it: MyAppUITests
4. Click Finish

Xcode creates:
- MyAppUITests/
  - MyAppUITests.swift     ← your test file
  - MyAppUITestsLaunchTests.swift

import XCTest

final class LoginTests: XCTestCase {
    var app: XCUIApplication!

    override func setUpWithError() throws {
        continueAfterFailure = false
        app = XCUIApplication()
        app.launch()
    }

    override func tearDownWithError() throws {
        app = nil
    }

    func testLoginWithValidCredentials() throws {
        let emailField = app.textFields["Email"]
        emailField.tap()
        emailField.typeText("alice@example.com")

        let passwordField = app.secureTextFields["Password"]
        passwordField.tap()
        passwordField.typeText("pass123")

        app.buttons["Login"].tap()

        XCTAssertTrue(app.staticTexts["Welcome, Alice"].exists)
    }
}