Test parallelization in CI in Selenium Java - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is test parallelization in Continuous Integration (CI)?

Test parallelization means running multiple tests at the same time during CI to save time and get faster feedback.

beginner

Why is test parallelization important in CI pipelines?

It reduces the total test execution time, allowing developers to find and fix bugs faster, improving productivity.

intermediate

Name one common challenge when running Selenium tests in parallel.

Tests might interfere with each other if they share the same browser session or test data, causing flaky results.

intermediate

How can you configure test parallelization in a Java Selenium project using TestNG?

In the TestNG XML file, set the attribute parallel="tests" or parallel="methods" and specify thread-count to run tests in parallel.

intermediate

What is a best practice to avoid flaky tests when running Selenium tests in parallel?

Use separate browser instances for each test and isolate test data to prevent tests from affecting each other.

What does test parallelization in CI help achieve?

A Faster test execution

B More test failures

C Longer build times

D Less test coverage

Running tests in parallel reduces total test time, making execution faster.

Which TestNG attribute controls parallel test execution?

A thread-count

B timeout

C parallel

D dependsOnMethods

The 'parallel' attribute in TestNG XML enables parallel execution.

What is a common cause of flaky Selenium tests in parallel runs?

A Writing more assertions

B Using different browsers

C Running tests sequentially

D Shared browser sessions

Sharing browser sessions can cause tests to interfere and fail unpredictably.

In CI, why isolate test data for parallel tests?

A To prevent tests from affecting each other

B To slow down tests

C To reduce test coverage

D To increase test dependencies

Isolating data ensures tests run independently without conflicts.

Which tool is commonly used to run Selenium tests in parallel in Java projects?

A Maven Surefire without config

B TestNG

C JUnit 3

D Ant build tool

TestNG supports parallel test execution with configuration.

Explain how test parallelization works in a CI pipeline and why it is beneficial.

Think about how running tests together saves waiting time.

Describe best practices to avoid flaky Selenium tests when running them in parallel.

Consider what causes tests to interfere with each other.