Selenium Testing Framework Selenium Grid & Parallel Testing 2

Question 1

What is the benefit of using Docker containers for Selenium Grid nodes?

Accepted Answer

Easy scalability and consistent browser environments

Answer

Docker containers allow Grid nodes to be spun up and torn down quickly with a consistent, isolated browser environment every time.

Question 2

Which TestNG annotation is used to enable parallel test execution across methods in a suite?

Accepted Answer

parallel='methods' in testng.xml

Answer

In testng.xml, setting parallel='methods' on the <suite> tag causes TestNG to run test methods in parallel threads.

Question 3

What is a 'node' in Selenium Grid?

Accepted Answer

A machine that executes browser sessions on behalf of the Hub

Answer

A Grid node is a machine (or container) that has browsers installed and receives commands from the Hub to run actual browser sessions.

Question 4

Which port does Selenium Grid 4 use as its default HTTP port?

Accepted Answer

4444

Answer

Selenium Grid 4 defaults to port 4444 for both the Hub and the standalone server.

Question 5

When running tests in parallel with Selenium Grid, why should each thread use its own WebDriver instance?

Accepted Answer

To prevent test interference since WebDriver is not thread-safe

Answer

WebDriver is not thread-safe, so sharing one instance across threads causes race conditions and unpredictable test failures.

Selenium Testing Framework Practice Test