Module 0 · Python for SDETs

Set Up Your
Python Test Stack

From an empty folder to a green test against a real app

Python venv pytest requests
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What you'll install

Four tools, one toolchain

🐍

Python 3.9+

The language your tests are written in.

📦

venv

An isolated, per-project package folder — no version clashes.

✅

pytest

The test runner that's the de-facto SDET standard.

🌐

requests

The library you'll use to call the app's REST API.

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The path to green

Setup, end to end

YOUR TEST PROJECT
Install Python
→
python -m venv .venv
→
activate
→
pip install pytest requests
THE PRACTICE APP, THEN PROOF
git clone
→
npm install && npm start
→
write test_smoke.py
→
✓ 1 passed
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Two terminals, two jobs
🖥️ Terminal 1 — the app
testmarket-lab
$ npm start
TestMarket Lab running
→ http://localhost:3000
(leave this running)
🧪 Terminal 2 — your tests
python-sdet
(.venv) active
$ pytest
1 passed in 0.05s
(run as often as you like)
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One test proves the whole stack
tests/test_smoke.py
import requests
def test_products_endpoint_is_up():
r = requests.get("http://localhost:3000/api/products")
assert r.status_code == 200
products = r.json()
assert isinstance(products, list)
assert len(products) > 0
pytest
python-sdet
collected 1 item
tests/test_smoke.py . [100%]
1 passed in 0.05s
Green = Python + venv + pytest + requests + the app all wired up.
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🎉

You're
Set Up

A real local stack — and a real app answering on :3000

➡️
Module 1
pytest itself — discovery, assert, running exactly what you want
♻️
Reset anytime
POST /api/reset returns the data to a known state
🖥️
Keep it running
The app stays up in its own terminal while you test
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← / → · space