Why parametrize multiplies test coverage in PyTest - Quick Recap

Recall & Review

beginner

What does @pytest.mark.parametrize do in a test?

It runs the same test function multiple times with different input values, increasing test coverage by checking more cases.

beginner

How does parametrize help find bugs?

By testing many input combinations automatically, it can reveal bugs that only happen with certain inputs.

beginner

Why is parametrize better than writing many similar tests?

It saves time and code by reusing one test function with different data instead of writing many separate tests.

beginner

What is a real-life example of parametrize?

Testing a calculator's add function with many pairs of numbers to check all results without writing many tests.

intermediate

How does parametrize improve test reports?

Each input set runs as a separate test case, so reports show exactly which inputs passed or failed.

What is the main benefit of using @pytest.mark.parametrize?

A Skips tests automatically

B Runs tests in parallel

C Generates random test data

D Runs one test multiple times with different inputs

Parametrize runs the same test function multiple times with different input values.

How does parametrize affect test coverage?

A Increases coverage by testing many inputs

B Decreases coverage by limiting inputs

C Has no effect on coverage

D Only tests one input

Parametrize increases coverage by running tests with many different inputs.

Which is NOT a benefit of parametrize?

A Reduces duplicate code

B Improves test clarity by separating cases

C Automatically fixes bugs

D Makes test reports clearer

Parametrize helps find bugs but does not fix them automatically.

What happens if one input case fails in a parametrize test?

A All tests stop immediately

B Only that input case fails, others run normally

C All input cases pass automatically

D Test runner crashes

Each input case runs independently; failure in one does not stop others.

Which syntax correctly uses parametrize?

A @pytest.mark.parametrize('x,y', [(1,2), (3,4)]) def test_add(x, y): assert x + y > 0

B @pytest.skip def test_add(): pass

C def test_add(): assert 1 + 1 == 2

D @pytest.mark.randomize def test_add(): pass

Option A shows correct parametrize usage with input pairs.

Explain how @pytest.mark.parametrize helps increase test coverage.

Think about running one test many times with different data.

Describe the advantages of using parametrize instead of writing many similar test functions.

Consider code reuse and test clarity.