Single responsibility per test in PyTest - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does 'single responsibility per test' mean in software testing?

It means each test should check only one specific behavior or feature. This makes tests easier to understand and fix when they fail.

beginner

Why is it better to have one assertion per test?

Having one assertion per test helps quickly find what went wrong. If a test fails, you know exactly which part of the code has a problem.

intermediate

Example of a bad test violating single responsibility principle:

A test that checks if a user can log in and also if the user profile loads correctly. These should be two separate tests.

intermediate

How does single responsibility per test help with test maintenance?

When tests focus on one thing, it's easier to update or fix them if the related feature changes. It reduces confusion and errors.

beginner

In pytest, how can you organize tests to follow single responsibility?

Write small test functions each testing one behavior. Use clear names describing what each test checks.

What is the main benefit of having a single responsibility per test?

A Allows multiple features to be tested together

B Runs tests faster

C Easier to find the cause of failure

D Reduces the number of tests needed

When each test checks only one thing, failures point directly to the problem.

Which of these violates the single responsibility principle in testing?

A Test login functionality only

B Test logout functionality only

C Test password reset separately

D Test user registration and profile update in one test

Testing multiple features in one test makes it harder to identify issues.

In pytest, how should you name tests to support single responsibility?

A Use descriptive names like test_login_with_valid_credentials

B Use generic names like test_feature

C Use numbers like test1, test2

D Use long paragraphs as names

Descriptive names clarify what each test checks, supporting single responsibility.

What happens if a test has multiple responsibilities and fails?

A You may need to debug multiple features

B You immediately know the exact problem

C The test will always pass

D The test will run faster

Multiple responsibilities make it unclear which part caused failure.

Which practice helps maintain tests better?

A Combining many checks in one test

B Writing one test per feature or behavior

C Skipping tests for small features

D Writing tests without assertions

One test per behavior keeps tests clear and easier to update.

Explain why single responsibility per test is important and how it improves test quality.

Think about how you find problems faster when tests focus on one thing.

Describe how you would write pytest functions to follow the single responsibility principle.

Imagine each test as a small story about one feature.