Education with Selenium

import org.testng.annotations.*;
import org.openqa.selenium.*;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.chrome.ChromeOptions;
import java.util.Map;
import org.openqa.selenium.support.ui.*;
import java.time.Duration;
import static org.openqa.selenium.support.ui.ExpectedConditions.*;

// Locators in this suite: By.id ×1 · By.name ×1 · By.xpath ×5 · By.cssSelector ×5 · data-testid ×11
public class LearnHubCertificateTest {
  static final String BASE = "https://www.practiceqaautomation.com";
  WebDriver driver;
  WebDriverWait wait;

  // Small helpers: every action takes a By and waits for its element first (no Thread.sleep).
  By tid(String id) { return By.cssSelector("[data-testid='" + id + "']"); }
  WebElement ready(By by) { return centre(wait.until(elementToBeClickable(by))); }
  void click(By by) { ready(by).click(); }
  WebElement nth(String id, int n) { return centre(wait.until(numberOfElementsToBeMoreThan(tid(id), n)).get(n)); }
  void clickNth(String id, int n) { nth(id, n).click(); }
  // Scroll to the middle of the screen first: Selenium only scrolls an element to the edge,
  // where a sticky header or a fixed bottom bar can cover it (ElementClickInterceptedException).
  WebElement centre(WebElement e) {
    ((JavascriptExecutor) driver).executeScript("arguments[0].scrollIntoView({block: 'center', inline: 'nearest'})", e);
    return e;
  }
  void type(By by, String text) { ready(by).sendKeys(text); }
  void select(By by, String value) { new Select(ready(by)).selectByValue(value); }
  void check(By by) { WebElement e = ready(by); if (!e.isSelected()) e.click(); }
  void expectText(By by, String text) { wait.until(textToBePresentInElementLocated(by, text)); }
  void expectVisible(By by) { wait.until(visibilityOfElementLocated(by)); }
  void expectNthText(String id, int n, String text) {
    wait.until(d -> d.findElements(tid(id)).size() > n && d.findElements(tid(id)).get(n).getText().contains(text));
  }

  @BeforeMethod
  public void setUp() {
    ChromeOptions options = new ChromeOptions();
    // Turn off Chrome's "Save password?" and "password found in a data breach" pop-ups: after a
    // login they take the keyboard and mouse away from the page, so later typing and clicks are lost.
    options.setExperimentalOption("prefs", Map.of(
        "credentials_enable_service", false,
        "profile.password_manager_enabled", false,
        "profile.password_manager_leak_detection", false));
    driver = new ChromeDriver(options);
    wait = new WebDriverWait(driver, Duration.ofSeconds(10));
  }

  @AfterMethod(alwaysRun = true)
  public void tearDown() { driver.quit(); }

  @Test
  public void completesACourseAndEarnsACertificate() {
    driver.get(BASE + "/apps/lms");
    type(By.id("login-email"), "learner@learnhub.dev");
    type(By.name("login-password"), "Learn@123");
    click(tid("login-submit"));
    wait.until(urlContains("/apps/lms/courses"));
    type(By.cssSelector("[aria-label='Search courses']"), "Selenium");
    expectText(tid("course-count"), "1 course");
    click(By.xpath("//button[normalize-space()='Enroll for free']"));
    wait.until(urlContains("/apps/lms/course/c1"));

    // Each lesson: play the video, then mark it complete (auto-advances)
    click(By.cssSelector("[aria-label='Play video']"));
    click(By.xpath("//button[normalize-space()='Mark complete']"));
    click(By.cssSelector("[aria-label='Play video']"));
    click(By.xpath("//button[normalize-space()='Mark complete']"));
    click(By.cssSelector("[aria-label='Play video']"));
    click(By.xpath("//button[normalize-space()='Mark complete']"));
    expectText(tid("course-progress"), "100%");
    click(tid("start-quiz"));
    click(tid("q1-b"));
    check(tid("q2-a"));
    check(tid("q2-c"));
    select(tid("q3"), "frame");
    type(By.cssSelector("[placeholder='Type your answer']"), "data-testid");
    click(By.xpath("//button[normalize-space()='Submit answers']"));
    expectText(tid("quiz-score"), "100%");
    expectVisible(tid("certificate"));
    expectText(tid("certificate-id"), "LH-");
  }
}