RemoteWebDriver usage in Selenium Java - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of RemoteWebDriver session creation

What will be the output of the following Java Selenium code snippet when executed successfully?

Selenium Java

import org.openqa.selenium.remote.RemoteWebDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import java.net.URL;

public class TestRemote {
    public static void main(String[] args) throws Exception {
        DesiredCapabilities caps = new DesiredCapabilities();
        caps.setBrowserName("chrome");
        RemoteWebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), caps);
        System.out.println(driver.getCapabilities().getBrowserName());
        driver.quit();
    }
}

A firefox

B null

C chrome

D SessionNotCreatedException

💡 Hint

Look at the DesiredCapabilities set before creating the RemoteWebDriver.

The DesiredCapabilities specify the browser as 'chrome'. When the RemoteWebDriver session is created successfully, getCapabilities().getBrowserName() returns 'chrome'.

❓ assertion

intermediate

Correct assertion for page title after navigation

Which assertion correctly verifies that the page title is exactly 'Welcome Page' after navigating using RemoteWebDriver?

Selenium Java

RemoteWebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), new DesiredCapabilities("chrome", "", null));
driver.get("http://example.com/welcome");
String title = driver.getTitle();

A assertEquals("Welcome Page", title);

B assertTrue(title.contains("Welcome Page"));

C assertNotNull(title);

D assertFalse(title.isEmpty());

💡 Hint

Exact match is required, not just containment or non-null.

assertEquals("Welcome Page", title) checks that the title exactly matches the expected string. Other assertions are less strict or only check partial conditions.

❓ locator

advanced

Best locator strategy for RemoteWebDriver

Which locator strategy is best practice for locating a button with id 'submitBtn' when using RemoteWebDriver?

A driver.findElement(By.id("submitBtn"));

B driver.findElement(By.xpath("//button[@id='submitBtn']"));

C driver.findElement(By.cssSelector("button#submitBtn"));

D driver.findElement(By.className("submitBtn"));

💡 Hint

Id locators are fastest and most reliable if unique.

Using By.id is the fastest and most reliable locator if the id is unique. XPath and CSS selectors work but are slower or more complex. ClassName is incorrect because the id is not a class.

🔧 Debug

advanced

Identify the cause of SessionNotCreatedException

Given the code below, what is the most likely cause of the SessionNotCreatedException?

Selenium Java

DesiredCapabilities caps = new DesiredCapabilities();
caps.setBrowserName("internet explorer");
RemoteWebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), caps);

A RemoteWebDriver constructor requires a WebDriver instance, not DesiredCapabilities.

B The URL for RemoteWebDriver is incorrect.

C DesiredCapabilities does not support setting browserName.

D The Selenium Grid node does not support Internet Explorer browser.

💡 Hint

Check if the browser requested is available on the Selenium Grid node.

SessionNotCreatedException often occurs if the requested browser is not available or not configured on the Selenium Grid node. The URL and DesiredCapabilities usage are correct.

❓ framework

expert

Best practice for RemoteWebDriver test parallelization

Which approach is best for running multiple RemoteWebDriver tests in parallel on a Selenium Grid to maximize resource usage and avoid session conflicts?

A Instantiate RemoteWebDriver once before all tests and reuse it for all tests sequentially.

B Create a new RemoteWebDriver instance in each test method and use thread-safe test runners.

C Use a single RemoteWebDriver instance shared across all test threads.

D Run tests sequentially to avoid any concurrency issues.

💡 Hint

Consider thread safety and independent sessions for parallel tests.

Creating a new RemoteWebDriver instance per test method and using thread-safe test runners allows parallel execution without session conflicts. Sharing one instance across threads causes conflicts. Reusing one instance sequentially is not parallel. Running sequentially wastes parallel capability.

Practice

1. What is the main purpose of using RemoteWebDriver in Selenium?

easy

A. To run browser tests on remote machines or servers

B. To run tests only on the local machine

C. To write tests without a browser

D. To speed up test execution on the local browser

Solution

1. Step 1: Understand RemoteWebDriver's role

   RemoteWebDriver allows running tests on browsers that are not on the local machine but on remote servers or machines.

2. Step 2: Compare options

   Options A, C, and D do not describe remote execution. Only To run browser tests on remote machines or servers correctly states the purpose.

3. Final Answer:

   To run browser tests on remote machines or servers -> Option A

4. Quick Check:

   RemoteWebDriver = remote test execution [OK]

Hint: RemoteWebDriver = tests run on remote machines [OK]

Common Mistakes:

• Thinking RemoteWebDriver runs tests locally
• Confusing RemoteWebDriver with headless testing
• Assuming RemoteWebDriver speeds up local tests

2. Which of the following is the correct way to create a RemoteWebDriver instance in Java?

easy

A. RemoteWebDriver driver = new RemoteWebDriver();

B. RemoteWebDriver driver = new RemoteWebDriver("http://localhost:4444/wd/hub", new ChromeOptions());

C. RemoteWebDriver driver = new RemoteWebDriver(new ChromeOptions(), new URL("http://localhost:4444/wd/hub"));

D. RemoteWebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), new ChromeOptions());

Solution

1. Step 1: Check RemoteWebDriver constructor parameters

   The constructor requires a URL object for the remote server and browser options as parameters.

2. Step 2: Validate each option

   RemoteWebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), new ChromeOptions()); correctly uses new URL(...) and new ChromeOptions() in the right order. RemoteWebDriver driver = new RemoteWebDriver("http://localhost:4444/wd/hub", new ChromeOptions()); passes a String instead of URL. RemoteWebDriver driver = new RemoteWebDriver(new ChromeOptions(), new URL("http://localhost:4444/wd/hub")); reverses parameters. RemoteWebDriver driver = new RemoteWebDriver(); uses no parameters, which is invalid.

3. Final Answer:

   RemoteWebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), new ChromeOptions()); -> Option D

4. Quick Check:

   Constructor needs URL then Options [OK]

Hint: Use new URL(...) first, then browser options [OK]

Common Mistakes:

• Passing String instead of URL object
• Swapping parameters order
• Using default constructor without parameters

3. What will happen if you run this code snippet?

URL url = new URL("http://localhost:4444/wd/hub");
ChromeOptions options = new ChromeOptions();
RemoteWebDriver driver = new RemoteWebDriver(url, options);
driver.get("https://example.com");
System.out.println(driver.getTitle());
driver.quit();

medium

A. It throws a runtime error because getTitle() is not supported

B. It opens Chrome on the remote server, navigates to example.com, prints the page title, then closes the browser

C. It opens Chrome locally and prints the title of the local browser

D. It throws a compile-time error due to wrong constructor usage

Solution

1. Step 1: Analyze RemoteWebDriver usage

   The code creates a RemoteWebDriver with a valid URL and ChromeOptions, then navigates to a website and prints the title.

2. Step 2: Understand execution flow

   The driver runs on the remote server at the URL, opens Chrome, loads the page, prints the title, and quits cleanly. No errors expected.

3. Final Answer:

   It opens Chrome on the remote server, navigates to example.com, prints the page title, then closes the browser -> Option B

4. Quick Check:

   RemoteWebDriver runs remote browser and prints title [OK]

Hint: RemoteWebDriver runs remote browser, prints title, then quits [OK]

Common Mistakes:

• Assuming it runs locally
• Expecting compile or runtime errors
• Thinking getTitle() is unsupported

4. Identify the error in this code snippet:

RemoteWebDriver driver = new RemoteWebDriver("http://localhost:4444/wd/hub", new FirefoxOptions());
driver.get("https://example.com");

medium

A. The URL parameter should be a java.net.URL object, not a String

B. FirefoxOptions cannot be used with RemoteWebDriver

C. driver.get() method is not valid for RemoteWebDriver

D. RemoteWebDriver cannot be instantiated directly

Solution

1. Step 1: Check constructor parameter types

   RemoteWebDriver constructor expects a URL object, not a String. Passing a String causes a compile-time error.

2. Step 2: Verify other options

   FirefoxOptions is valid for RemoteWebDriver. driver.get() is valid. RemoteWebDriver can be instantiated directly.

3. Final Answer:

   The URL parameter should be a java.net.URL object, not a String -> Option A

4. Quick Check:

   Constructor needs URL object, not String [OK]

Hint: Use new URL(...) for remote URL, not plain String [OK]

Common Mistakes:

• Passing String instead of URL object
• Thinking FirefoxOptions is invalid
• Believing driver.get() is unsupported

5. You want to run tests on Chrome and Firefox browsers on a Selenium Grid server at http://grid.example.com:4444/wd/hub. Which code snippet correctly creates two RemoteWebDriver instances for this purpose?

hard

A. RemoteWebDriver chromeDriver = new RemoteWebDriver(new ChromeOptions(), new URL("http://grid.example.com:4444/wd/hub"));
RemoteWebDriver firefoxDriver = new RemoteWebDriver(new FirefoxOptions(), new URL("http://grid.example.com:4444/wd/hub"));

B. RemoteWebDriver chromeDriver = new RemoteWebDriver("http://grid.example.com:4444/wd/hub", new ChromeOptions());
RemoteWebDriver firefoxDriver = new RemoteWebDriver("http://grid.example.com:4444/wd/hub", new FirefoxOptions());

C. RemoteWebDriver chromeDriver = new RemoteWebDriver(new URL("http://grid.example.com:4444/wd/hub"), new ChromeOptions());
RemoteWebDriver firefoxDriver = new RemoteWebDriver(new URL("http://grid.example.com:4444/wd/hub"), new FirefoxOptions());

D. RemoteWebDriver chromeDriver = new RemoteWebDriver();
RemoteWebDriver firefoxDriver = new RemoteWebDriver();

Solution

1. Step 1: Confirm correct constructor usage for both drivers

   Each RemoteWebDriver must be created with a java.net.URL object and the corresponding browser options (ChromeOptions or FirefoxOptions).

2. Step 2: Evaluate each option

   RemoteWebDriver chromeDriver = new RemoteWebDriver(new URL("http://grid.example.com:4444/wd/hub"), new ChromeOptions()); RemoteWebDriver firefoxDriver = new RemoteWebDriver(new URL("http://grid.example.com:4444/wd/hub"), new FirefoxOptions()); correctly uses new URL(...) and proper options for both drivers. RemoteWebDriver chromeDriver = new RemoteWebDriver("http://grid.example.com:4444/wd/hub", new ChromeOptions()); RemoteWebDriver firefoxDriver = new RemoteWebDriver("http://grid.example.com:4444/wd/hub", new FirefoxOptions()); passes String instead of URL. RemoteWebDriver chromeDriver = new RemoteWebDriver(new ChromeOptions(), new URL("http://grid.example.com:4444/wd/hub")); RemoteWebDriver firefoxDriver = new RemoteWebDriver(new FirefoxOptions(), new URL("http://grid.example.com:4444/wd/hub")); swaps parameters. RemoteWebDriver chromeDriver = new RemoteWebDriver(); RemoteWebDriver firefoxDriver = new RemoteWebDriver(); uses no parameters, which is invalid.

3. Final Answer:

   RemoteWebDriver chromeDriver = new RemoteWebDriver(new URL("http://grid.example.com:4444/wd/hub"), new ChromeOptions()); RemoteWebDriver firefoxDriver = new RemoteWebDriver(new URL("http://grid.example.com:4444/wd/hub"), new FirefoxOptions()); -> Option C

4. Quick Check:

   Use URL object first, then browser options for each driver [OK]

Hint: Create each driver with new URL(...) and correct Options [OK]

Common Mistakes:

• Passing String instead of URL
• Swapping constructor parameters
• Trying to instantiate without parameters