Regression testing in Testing Fundamentals - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is regression testing?

Regression testing is a type of software testing that checks if recent code changes have broken existing features or caused new bugs.

beginner

Why is regression testing important in data science projects?

It ensures that updates or new models do not break existing data pipelines, analyses, or reports, keeping results reliable.

beginner

When should regression testing be performed?

After any change in code, such as bug fixes, new features, or updates, to confirm old functions still work correctly.

intermediate

What is a common method to automate regression testing?

Using automated test scripts that run predefined tests quickly and repeatedly to catch errors early.

intermediate

How does regression testing differ from unit testing?

Unit testing checks individual parts of code for correctness, while regression testing checks that changes don’t break existing overall functionality.

What is the main goal of regression testing?

A To check if recent changes broke existing functionality

B To write new code

C To test the speed of the software

D To verify new features work correctly

Regression testing focuses on ensuring that recent code changes do not break existing features.

When should regression testing be done?

A After every code change

B Only before the first release

C Only when bugs are found

D Once a year

Regression testing is done after every code change to catch any new issues early.

Which of these is a benefit of automating regression tests?

A Slower testing process

B More manual work

C Less reliable results

D Faster and repeatable tests

Automation makes regression tests faster and easy to repeat whenever needed.

Regression testing is mainly used to:

A Design new software

B Test new features only

C Check if old features still work after changes

D Improve user interface

It ensures that existing features continue to work after updates.

Which testing type focuses on individual code parts rather than overall system behavior?

A Regression testing

B Unit testing

C Integration testing

D System testing

Unit testing checks small parts of code separately.

Explain in your own words what regression testing is and why it matters in data science projects.

Think about how changes in code might affect your data analysis or models.

Describe when and how you would perform regression testing during a project update.

Consider the steps after you add or fix something in your code.