pytest-skill

Name: pytest-skill
Author: LambdaTest

208installs67forks

How to install pytest-skill?

lambdatest/agent-skills/pytest-skill

$npx -y skills add LambdaTest/agent-skills --skill pytest-skill

Installs into the current project.

Summary

Generates production-grade pytest tests in Python with fixtures, parametrize, markers, mocking, and conftest patterns. Use when user mentions "pytest", "conftest", "@pytest.fixture", "@pytest.mark", "Python test". Triggers on: "pytest", "conftest", "Python test", "parametrize", "

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SKILL.md

1	# Pytest Testing Skill
2
3	## Core Patterns
4
5	### Basic Test
6
7	```python
8	import pytest
9
10	def test_addition():
11	assert 2 + 3 == 5
12
13	def test_exception():
14	with pytest.raises(ValueError, match="invalid"):
15	int("not_a_number")
16
17	class TestCalculator:
18	def test_add(self):
19	calc = Calculator()
20	assert calc.add(2, 3) == 5
21
22	def test_divide_by_zero(self):
23	with pytest.raises(ZeroDivisionError):
24	Calculator().divide(10, 0)
25	```
26
27	### Fixtures
28
29	```python
30	@pytest.fixture
31	def calculator():
32	return Calculator()
33
34	@pytest.fixture
35	def db_connection():
36	conn = Database.connect("test_db")
37	yield conn # teardown after yield
38	conn.rollback()
39	conn.close()
40
41	@pytest.fixture(scope="module")
42	def api_client():
43	client = APIClient(base_url="http://localhost:8000")
44	yield client
45	client.logout()
46
47	# conftest.py - shared fixtures
48	@pytest.fixture(autouse=True)
49	def reset_state():
50	State.reset()
51	yield
52	State.cleanup()
53
54	# Usage
55	def test_add(calculator):
56	assert calculator.add(2, 3) == 5
57	```
58
59	### Parametrize
60
61	```python
62	@pytest.mark.parametrize("input,expected", [
63	("hello", 5), ("", 0), ("pytest", 6),
64	])
65	def test_string_length(input, expected):
66	assert len(input) == expected
67
68	@pytest.mark.parametrize("a,b,expected", [
69	(2, 3, 5), (-1, 1, 0), (0, 0, 0),
70	])
71	def test_add(calculator, a, b, expected):
72	assert calculator.add(a, b) == expected
73	```
74
75	### Markers
76
77	```python
78	@pytest.mark.slow
79	def test_large_dataset(): ...
80
81	@pytest.mark.skip(reason="Not implemented")
82	def test_future_feature(): ...
83
84	@pytest.mark.skipif(sys.platform == "win32", reason="Unix only")
85	def test_unix_permissions(): ...
86
87	@pytest.mark.xfail(reason="Known bug #123")
88	def test_known_bug(): ...
89	```
90
91	### Mocking
92
93	```python
94	from unittest.mock import patch, MagicMock
95
96	def test_send_email(mocker):
97	mock_smtp = mocker.patch("myapp.email.smtplib.SMTP")
98	send_welcome_email("user@test.com")
99	mock_smtp.return_value.sendmail.assert_called_once()
100
101	def test_api_call(mocker):
102	mock_response = mocker.Mock()
103	mock_response.status_code = 200
104	mock_response.json.return_value = {"users": [{"name": "Alice"}]}
105	mocker.patch("myapp.service.requests.get", return_value=mock_response)
106	users = get_users()
107	assert len(users) == 1
108
109	@patch("myapp.service.database")
110	def test_save_user(mock_db):
111	mock_db.save.return_value = True
112	assert save_user({"name": "Alice"}) is True
113	mock_db.save.assert_called_once()
114	```
115
116	### Assertions
117
118	```python
119	assert x == y
120	assert x != y
121	assert x in collection
122	assert isinstance(obj, MyClass)
123	assert 0.1 + 0.2 == pytest.approx(0.3)
124
125	with pytest.raises(ValueError) as exc_info:
126	raise ValueError("bad")
127	assert "bad" in str(exc_info.value)
128	```
129
130	### Anti-Patterns
131
132	\| Bad \| Good \| Why \|
133	\|-----\|------\|-----\|
134	\| `self.assertEqual()` \| `assert x == y` \| pytest rewrites give better output \|
135	\| Setup in `__init__` \| `@pytest.fixture` \| Lifecycle management \|
136	\| Global state \| Fixture with `yield` \| Proper cleanup \|
137	\| Huge test functions \| Small focused tests \| Easier debugging \|
138
139	## Quick Reference
140
141	\| Task \| Command \|
142	\|------\|---------\|
143	\| Run all \| `pytest` \|
144	\| Run file \| `pytest tests/test_login.py` \|
145	\| Run specific \| `pytest tests/test_login.py::test_login_success` \|
146	\| By marker \| `pytest -m slow` \|
147	\| By keyword \| `pytest -k "login and not invalid"` \|
148	\| Verbose \| `pytest -v` \|
149	\| Stop first fail \| `pytest -x` \|
150	\| Last failed \| `pytest --lf` \|
151	\| Coverage \| `pytest --cov=myapp --cov-report=html` \|
152	\| Parallel \| `pytest -n auto` (pytest-xdist) \|
153
154	## pyproject.toml
155
156	```toml
157	[tool.pytest.ini_options]
158	testpaths = ["tests"]
159	markers = ["slow: slow tests", "integration: integration tests"]
160	addopts = "-v --tb=short"
161	```
162
163	## Deep Patterns
164
165	For production-grade patterns, see `reference/playbook.md`:
166
167	\| Section \| What's Inside \|
168	\|---------\|--------------\|
169	\| §1 Config \| pytest.ini + pyproject.toml with markers, coverage \|
170	\| §2 Fixtures \| Scoping, factories, teardown, autouse, tmp_path \|
171	\| §3 Parametrize \| Basic, with IDs, cartesian, indirect \|
172	\| §4 Mocking \| pytest-mock, monkeypatch, spies, env vars \|
173	\| §5 Async \| pytest-asyncio, async fixtures, async client \|
174	\| §6 Exceptions \| pytest.raises(match=), warnings \|
175	\| §7 Markers & Plugins \| Custom markers, collection hooks \|
176	\| §8 Class-Based \| Nested classes, autouse setup \|
177	\| §9 CI/CD \| GitHub Actions matrix, coverage gates \|
178	\| §10 Debugging Table \| 10 common problems with fixes \|
179	\| §11 Best Practices \| 15-item production checklist \|

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6 picks

Type

pytest-skill

208installs67forks

View on GitHub

How to install pytest-skill?

lambdatest/agent-skills/pytest-skill

$npx -y skills add LambdaTest/agent-skills --skill pytest-skill

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# Pytest Testing Skill
2
3	## Core Patterns
4
5	### Basic Test
6
7	```python
8	import pytest
9
10	def test_addition():
11	assert 2 + 3 == 5
12
13	def test_exception():
14	with pytest.raises(ValueError, match="invalid"):
15	int("not_a_number")
16
17	class TestCalculator:
18	def test_add(self):
19	calc = Calculator()
20	assert calc.add(2, 3) == 5
21
22	def test_divide_by_zero(self):
23	with pytest.raises(ZeroDivisionError):
24	Calculator().divide(10, 0)
25	```
26
27	### Fixtures
28
29	```python
30	@pytest.fixture
31	def calculator():
32	return Calculator()
33
34	@pytest.fixture
35	def db_connection():
36	conn = Database.connect("test_db")
37	yield conn # teardown after yield
38	conn.rollback()
39	conn.close()
40
41	@pytest.fixture(scope="module")
42	def api_client():
43	client = APIClient(base_url="http://localhost:8000")
44	yield client
45	client.logout()
46
47	# conftest.py - shared fixtures
48	@pytest.fixture(autouse=True)
49	def reset_state():
50	State.reset()
51	yield
52	State.cleanup()
53
54	# Usage
55	def test_add(calculator):
56	assert calculator.add(2, 3) == 5
57	```
58
59	### Parametrize
60
61	```python
62	@pytest.mark.parametrize("input,expected", [
63	("hello", 5), ("", 0), ("pytest", 6),
64	])
65	def test_string_length(input, expected):
66	assert len(input) == expected
67
68	@pytest.mark.parametrize("a,b,expected", [
69	(2, 3, 5), (-1, 1, 0), (0, 0, 0),
70	])
71	def test_add(calculator, a, b, expected):
72	assert calculator.add(a, b) == expected
73	```
74
75	### Markers
76
77	```python
78	@pytest.mark.slow
79	def test_large_dataset(): ...
80
81	@pytest.mark.skip(reason="Not implemented")
82	def test_future_feature(): ...
83
84	@pytest.mark.skipif(sys.platform == "win32", reason="Unix only")
85	def test_unix_permissions(): ...
86
87	@pytest.mark.xfail(reason="Known bug #123")
88	def test_known_bug(): ...
89	```
90
91	### Mocking
92
93	```python
94	from unittest.mock import patch, MagicMock
95
96	def test_send_email(mocker):
97	mock_smtp = mocker.patch("myapp.email.smtplib.SMTP")
98	send_welcome_email("user@test.com")
99	mock_smtp.return_value.sendmail.assert_called_once()
100
101	def test_api_call(mocker):
102	mock_response = mocker.Mock()
103	mock_response.status_code = 200
104	mock_response.json.return_value = {"users": [{"name": "Alice"}]}
105	mocker.patch("myapp.service.requests.get", return_value=mock_response)
106	users = get_users()
107	assert len(users) == 1
108
109	@patch("myapp.service.database")
110	def test_save_user(mock_db):
111	mock_db.save.return_value = True
112	assert save_user({"name": "Alice"}) is True
113	mock_db.save.assert_called_once()
114	```
115
116	### Assertions
117
118	```python
119	assert x == y
120	assert x != y
121	assert x in collection
122	assert isinstance(obj, MyClass)
123	assert 0.1 + 0.2 == pytest.approx(0.3)
124
125	with pytest.raises(ValueError) as exc_info:
126	raise ValueError("bad")
127	assert "bad" in str(exc_info.value)
128	```
129
130	### Anti-Patterns
131
132	\| Bad \| Good \| Why \|
133	\|-----\|------\|-----\|
134	\| `self.assertEqual()` \| `assert x == y` \| pytest rewrites give better output \|
135	\| Setup in `__init__` \| `@pytest.fixture` \| Lifecycle management \|
136	\| Global state \| Fixture with `yield` \| Proper cleanup \|
137	\| Huge test functions \| Small focused tests \| Easier debugging \|
138
139	## Quick Reference
140
141	\| Task \| Command \|
142	\|------\|---------\|
143	\| Run all \| `pytest` \|
144	\| Run file \| `pytest tests/test_login.py` \|
145	\| Run specific \| `pytest tests/test_login.py::test_login_success` \|
146	\| By marker \| `pytest -m slow` \|
147	\| By keyword \| `pytest -k "login and not invalid"` \|
148	\| Verbose \| `pytest -v` \|
149	\| Stop first fail \| `pytest -x` \|
150	\| Last failed \| `pytest --lf` \|
151	\| Coverage \| `pytest --cov=myapp --cov-report=html` \|
152	\| Parallel \| `pytest -n auto` (pytest-xdist) \|
153
154	## pyproject.toml
155
156	```toml
157	[tool.pytest.ini_options]
158	testpaths = ["tests"]
159	markers = ["slow: slow tests", "integration: integration tests"]
160	addopts = "-v --tb=short"
161	```
162
163	## Deep Patterns
164
165	For production-grade patterns, see `reference/playbook.md`:
166
167	\| Section \| What's Inside \|
168	\|---------\|--------------\|
169	\| §1 Config \| pytest.ini + pyproject.toml with markers, coverage \|
170	\| §2 Fixtures \| Scoping, factories, teardown, autouse, tmp_path \|
171	\| §3 Parametrize \| Basic, with IDs, cartesian, indirect \|
172	\| §4 Mocking \| pytest-mock, monkeypatch, spies, env vars \|
173	\| §5 Async \| pytest-asyncio, async fixtures, async client \|
174	\| §6 Exceptions \| pytest.raises(match=), warnings \|
175	\| §7 Markers & Plugins \| Custom markers, collection hooks \|
176	\| §8 Class-Based \| Nested classes, autouse setup \|
177	\| §9 CI/CD \| GitHub Actions matrix, coverage gates \|
178	\| §10 Debugging Table \| 10 common problems with fixes \|
179	\| §11 Best Practices \| 15-item production checklist \|

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6 picks

Type