Testing & modern typing
pytest basics, mocks, type hints, TypedDict, Protocol, and static-checking patterns.
How to Skip Slow Tests with pytest.mark in Python
Use pytest.mark.skip and custom marks like @pytest.mark.slow to skip or deselect slow tests during test runs.
import pytest
import time
def test_fast():
assert 1 + 1 == 2
@pytest.mark.skip(reason="slow test skipped by default")
def test_slow():
time.sleep(5)
assert True
@pytest.mark.slow
def test_marked_slow():
time.sleep(5)
assert True
if __name__ == "__main__":
pytest.main([__file__, "-v", "-…How to Write a Fast Smoke Test for a Critical Path in Python
A quick smoke test that validates the /health critical path executes fast enough, raising errors on wrong paths or slow responses.
import time
def smoke_test(path):
if path != "/health":
raise ValueError("Critical path expected /health")
start = time.perf_counter()
# Simulate the critical health check work
time.sleep(0.01)
elapsed = time.perf_counter() - start
if elapsed > 0.05:
raise RuntimeError("Health …Browse by section
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Testing & modern typing — Python code examples
What you will find here
This page collects testing & modern typing snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.
Samples vs tutorials and challenges
Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.