Test class consuming page objects in Selenium Java - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of test method using page object

Given the following test class using a page object, what will be the output when the test runs successfully?

Selenium Java

public class LoginPage {
    private WebDriver driver;
    public LoginPage(WebDriver driver) {
        this.driver = driver;
    }
    public void enterUsername(String username) {
        driver.findElement(By.id("username")).sendKeys(username);
    }
    public void enterPassword(String password) {
        driver.findElement(By.id("password")).sendKeys(password);
    }
    public void clickLogin() {
        driver.findElement(By.id("loginBtn")).click();
    }
    public String getWelcomeMessage() {
        return driver.findElement(By.id("welcomeMsg")).getText();
    }
}

public class LoginTest {
    WebDriver driver = new ChromeDriver();
    LoginPage loginPage = new LoginPage(driver);

    @Test
    public void testValidLogin() {
        driver.get("http://example.com/login");
        loginPage.enterUsername("user1");
        loginPage.enterPassword("pass1");
        loginPage.clickLogin();
        String message = loginPage.getWelcomeMessage();
        System.out.println(message);
    }
}

A Prints "Welcome user1!" to the console

B Throws NoSuchElementException at enterUsername

C Prints empty string because welcomeMsg element is missing

D Throws NullPointerException at clickLogin

💡 Hint

Think about what the page object methods do and what the getWelcomeMessage returns after login.

The test simulates a valid login. After clicking login, the page shows a welcome message with the username. The getWelcomeMessage method returns this text, which is printed.

❓ assertion

intermediate

Correct assertion for login success

Which assertion correctly verifies that the login was successful by checking the welcome message using the page object?

Selenium Java

String expectedMessage = "Welcome user1!";
String actualMessage = loginPage.getWelcomeMessage();

A assertNull(actualMessage);

B assertEquals(expectedMessage, actualMessage);

C assertFalse(actualMessage.isEmpty());

D assertTrue(actualMessage.contains("user1"));

💡 Hint

Check which assertion exactly compares the expected and actual welcome messages.

assertEquals compares the expected and actual strings exactly, ensuring the welcome message is correct.

❓ locator

advanced

Best locator for login button in page object

Which locator is the best practice to use for the login button in the page object class to ensure stability and readability?

A By.cssSelector("button.btn-primary")

B By.xpath("//button[text()='Login']")

C By.id("loginBtn")

D By.className("btn")

💡 Hint

Consider uniqueness and stability of locators.

Using By.id is best because IDs are unique and less likely to change, making tests more stable and readable.

🔧 Debug

advanced

Identify cause of NoSuchElementException in test

A test using a page object fails with NoSuchElementException at the line driver.findElement(By.id("password")).sendKeys("pass1");. What is the most likely cause?

A The driver instance is null

B The id "password" is misspelled in the page object

C The sendKeys method is called before driver.get()

D The password input field is not present on the current page

💡 Hint

Think about what causes NoSuchElementException in Selenium.

NoSuchElementException means Selenium cannot find the element. The most common reason is the element is not on the page currently loaded.

❓ framework

expert

Proper test class structure using page objects and JUnit 5

Which test class structure correctly uses JUnit 5 annotations and page objects to initialize WebDriver before all tests and quit after all tests?

A

public class LoginTest {
    static WebDriver driver;
    static LoginPage loginPage;

    @BeforeAll
    public static void setup() {
        driver = new ChromeDriver();
        loginPage = new LoginPage(driver);
    }

    @AfterAll
    public static void teardown() {
        driver.quit();
    }

    @Test
    public void testLogin() {
        driver.get("http://example.com/login");
        loginPage.enterUsername("user1");
        loginPage.enterPassword("pass1");
        loginPage.clickLogin();
        assertEquals("Welcome user1!", loginPage.getWelcomeMessage());
    }
}

B

public class LoginTest {
    WebDriver driver = new ChromeDriver();
    LoginPage loginPage = new LoginPage(driver);

    @BeforeEach
    public void setup() {
        driver = new ChromeDriver();
        loginPage = new LoginPage(driver);
    }

    @AfterEach
    public void teardown() {
        driver.quit();
    }

    @Test
    public void testLogin() {
        driver.get("http://example.com/login");
        loginPage.enterUsername("user1");
        loginPage.enterPassword("pass1");
        loginPage.clickLogin();
        assertEquals("Welcome user1!", loginPage.getWelcomeMessage());
    }
}

C

public class LoginTest {
    static WebDriver driver;
    LoginPage loginPage;

    @BeforeAll
    public void setup() {
        driver = new ChromeDriver();
        loginPage = new LoginPage(driver);
    }

    @AfterAll
    public void teardown() {
        driver.quit();
    }

    @Test
    public void testLogin() {
        driver.get("http://example.com/login");
        loginPage.enterUsername("user1");
        loginPage.enterPassword("pass1");
        loginPage.clickLogin();
        assertEquals("Welcome user1!", loginPage.getWelcomeMessage());
    }
}

D

public class LoginTest {
    WebDriver driver;
    LoginPage loginPage;

    @BeforeEach
    public void setup() {
        driver = new ChromeDriver();
        loginPage = new LoginPage(driver);
    }

    @AfterAll
    public void teardown() {
        driver.quit();
    }

    @Test
    public void testLogin() {
        driver.get("http://example.com/login");
        loginPage.enterUsername("user1");
        loginPage.enterPassword("pass1");
        loginPage.clickLogin();
        assertEquals("Welcome user1!", loginPage.getWelcomeMessage());
    }
}

💡 Hint

Remember that @BeforeAll and @AfterAll methods must be static in JUnit 5.

Option A correctly uses static methods for @BeforeAll and @AfterAll to initialize and quit WebDriver once for all tests, and initializes the page object accordingly.