RemoteWebDriver usage in Selenium Java - Test Execution Trace

Test Overview

This test opens a browser remotely using RemoteWebDriver, navigates to a website, clicks a button, and verifies the page title.

Test Code - JUnit

Selenium Java

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.openqa.selenium.support.ui.ExpectedConditions;
import java.net.URL;
import java.time.Duration;
import static org.junit.Assert.assertEquals;

public class RemoteWebDriverTest {
    public static void main(String[] args) throws Exception {
        DesiredCapabilities capabilities = new DesiredCapabilities();
        capabilities.setBrowserName("chrome");

        WebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), capabilities);

        try {
            driver.get("https://example.com");

            WebDriverWait wait = new WebDriverWait(driver, Duration.ofSeconds(10));
            WebElement moreInfoLink = wait.until(ExpectedConditions.elementToBeClickable(By.cssSelector("a.more-info")));

            moreInfoLink.click();

            wait.until(ExpectedConditions.titleContains("More Information"));

            String title = driver.getTitle();
            assertEquals("More Information - Example Domain", title);

        } finally {
            driver.quit();
        }
    }
}

Execution Trace - 8 Steps

Step	Action	System State	Assertion	Result
1	Create DesiredCapabilities for Chrome browser	Capabilities object set to use Chrome	—	PASS
2	Instantiate RemoteWebDriver with Selenium Grid URL and capabilities	Remote browser session started on Selenium Grid	—	PASS
3	Navigate to https://example.com	Browser opened with example.com loaded	Page URL is https://example.com	PASS
4	Wait until the 'More Info' link is clickable	'More Info' link is visible and clickable	Element located by CSS selector 'a.more-info' is clickable	PASS
5	Click the 'More Info' link	Browser navigates to the More Information page	—	PASS
6	Wait until page title contains 'More Information'	Page title updated to include 'More Information'	Title contains 'More Information'	PASS
7	Get page title and assert it equals 'More Information - Example Domain'	Page title is 'More Information - Example Domain'	assertEquals passes confirming correct page title	PASS
8	Quit the RemoteWebDriver session	Browser session closed	—	PASS

Failure Scenario

Failing Condition: The 'More Info' link is not found or not clickable within 10 seconds

Execution Trace Quiz - 3 Questions

What does the RemoteWebDriver connect to in this test?

A A Selenium Grid server at http://localhost:4444/wd/hub

B A local Chrome browser instance

C A mobile device emulator

D A cloud testing service without URL

Key Result

Always use explicit waits like WebDriverWait with ExpectedConditions to handle dynamic page elements when using RemoteWebDriver.

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