Module 2 · Python for SDETs

Fixtures & parametrize

Stop repeating setup — and run one test over many inputs

fixtures yield scope parametrize

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Fixtures = reusable setup

A test asks; pytest provides

@pytest.fixture
def base_url():
return "http://localhost:3000"

→

def test_products(base_url):
r = requests.get(base_url + "/api/products")
assert r.status_code == 200

💡The test names the fixture as a parameter; pytest runs it and injects the return value. That's dependency injection — no manual calls.

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yield — setup before, teardown after

BEFORE yield

setup

session = requests.Session()

yield

the test runs

yield session

AFTER yield

teardown

session.close()

🛡️Teardown runs even if the test fails — it replaces try/finally for cleanup.

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Scope — isolation vs speed

scope="function"once per test · the default · most isolated

scope="class"once per test class

scope="module"once per .py file

scope="session"once per whole run · fastest · shared state

⚖️Use the narrowest scope that's correct. Widen only for read-only or safe-to-share setup (like base_url).

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One test, many inputs

@pytest.mark.parametrize(
"category",
["electronics", "accessories", "furniture"],
)
def test_category(category):
# runs once per row

pytest -v

test_category[electronics] PASSED

test_category[accessories] PASSED

test_category[furniture] PASSED

One function → three independent results. Add a case = add a row. Name them with ids=.

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🧩

Fixtures inject setup · parametrize covers the table · conftest.py shares both

📁

conftest.py

Shared base_url / api / reset_db — found automatically, no import

🏷️

Markers

Tag tests (smoke/api) and select with -m; skip / xfail built in

➡️

Module 3

API testing with requests — every HTTP verb against the app

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