pytest-patterns

Name: pytest-patterns
Author: PramodDutta

2installs17forks

How to install pytest-patterns?

pramoddutta/qaskills/pytest-patterns

$npx -y skills add PramodDutta/qaskills --skill pytest-patterns

Installs into the current project.

Summary

Python testing skill using pytest, covering fixtures, parametrize, markers, conftest, plugins, mocking, and advanced testing patterns.

Files · 1

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SKILL.md

1	# Pytest Patterns Skill
2
3	You are an expert Python developer specializing in testing with pytest. When the user asks you to write, review, or debug pytest tests, follow these detailed instructions.
4
5	## Core Principles
6
7	1. Convention over configuration -- pytest discovers tests automatically by naming conventions.
8	2. Fixtures for setup -- Use fixtures instead of setUp/tearDown methods.
9	3. Parametrize for coverage -- Use `@pytest.mark.parametrize` for data-driven tests.
10	4. Descriptive test names -- Function names should describe the expected behavior.
11	5. Minimal test scope -- Each test verifies one behavior.
12
13	## Project Structure
14
15	```
16	project/
17	src/
18	myapp/
19	__init__.py
20	services/
21	user_service.py
22	order_service.py
23	models/
24	user.py
25	utils/
26	validators.py
27	tests/
28	__init__.py
29	conftest.py
30	unit/
31	__init__.py
32	test_user_service.py
33	test_validators.py
34	integration/
35	__init__.py
36	conftest.py
37	test_user_api.py
38	fixtures/
39	user_fixtures.py
40	pyproject.toml
41	pytest.ini
42	```
43
44	## Configuration
45
46	```ini
47	# pytest.ini
48	[pytest]
49	testpaths = tests
50	python_files = test_*.py
51	python_classes = Test*
52	python_functions = test_*
53	addopts = -v --tb=short --strict-markers
54	markers =
55	slow: marks tests as slow (deselect with '-m "not slow"')
56	integration: marks integration tests
57	smoke: marks smoke tests
58	unit: marks unit tests
59	```
60
61	```toml
62	# pyproject.toml
63	[tool.pytest.ini_options]
64	testpaths = ["tests"]
65	addopts = "-v --tb=short --strict-markers --cov=src --cov-report=term-missing"
66	markers = [
67	"slow: marks tests as slow",
68	"integration: marks integration tests",
69	"smoke: marks smoke tests",
70	]
71
72	[tool.coverage.run]
73	source = ["src"]
74	omit = ["tests/", "/__init__.py"]
75
76	[tool.coverage.report]
77	fail_under = 80
78	show_missing = true
79	```
80
81	## Fixtures
82
83	### Basic Fixtures
84
85	```python
86	# conftest.py
87	import pytest
88	from myapp.services.user_service import UserService
89	from myapp.models.user import User
90
91
92	@pytest.fixture
93	def sample_user():
94	"""Create a sample user for testing."""
95	return User(
96	id="user-123",
97	email="test@example.com",
98	name="Test User",
99	role="user",
100	)
101
102
103	@pytest.fixture
104	def admin_user():
105	"""Create an admin user for testing."""
106	return User(
107	id="admin-123",
108	email="admin@example.com",
109	name="Admin User",
110	role="admin",
111	)
112
113
114	@pytest.fixture
115	def user_service(mock_user_repo, mock_email_service):
116	"""Create UserService with mocked dependencies."""
117	return UserService(
118	user_repo=mock_user_repo,
119	email_service=mock_email_service,
120	)
121	```
122
123	### Fixture Scopes
124
125	```python
126	@pytest.fixture(scope="session")
127	def database_connection():
128	"""Create a database connection once for the entire test session."""
129	conn = create_connection("test_db")
130	yield conn
131	conn.close()
132
133
134	@pytest.fixture(scope="module")
135	def test_data(database_connection):
136	"""Seed test data once per module."""
137	seed_test_data(database_connection)
138	yield
139	cleanup_test_data(database_connection)
140
141
142	@pytest.fixture(scope="function") # default scope
143	def fresh_user():
144	"""Create a fresh user for each test function."""
145	return create_user(email=f"test-{uuid4()}@example.com")
146
147
148	@pytest.fixture(scope="class")
149	def shared_resource():
150	"""Share a resource across all methods in a test class."""
151	resource = create_expensive_resource()
152	yield resource
153	resource.cleanup()
154	```
155
156	### Fixture Factories
157
158	```python
159	@pytest.fixture
160	def make_user():
161	"""Factory fixture that creates users with custom attributes."""
162	created_users = []
163
164	def _make_user(
165	email: str = None,
166	name: str = "Test User",
167	role: str = "user",
168	) -> User:
169	user = User(
170	id=str(uuid4()),
171	email=email or f"test-{uuid4()}@example.com",
172	name=name,
173	role=role,
174	)
175	created_users.append(user)
176	return user
177
178	yield _make_user
179
180	# Cleanup
181	for user in created_users:
182	try:
183	delete_user(user.id)
184	except Exception:
185	pass
186
187
188	# Usage in tests
189	def test_admin_permissions(make_user):
190	admin = make_user(role="admin")
191	viewer = make_user(role="viewer")
192	assert admin.can_delete_users()
193	assert not viewer.can_delete_users()
194	```
195
196	### Yield Fixtures (Setup/Teardown)
197
198	```python
199	@pytest.fixture
200	def temp_file(tmp_path):
201	"""Create a temporary file and clean up after test."""
202	file_path = tmp_path / "test_data.json"
203	file_path.write_text('{"key": "value"}')
204	yield file_path
205	# Teardown happens automatica

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pytest-patterns

2installs17forks

View on GitHub

How to install pytest-patterns?

pramoddutta/qaskills/pytest-patterns

$npx -y skills add PramodDutta/qaskills --skill pytest-patterns

Installs into the current project.

Summary

Python testing skill using pytest, covering fixtures, parametrize, markers, conftest, plugins, mocking, and advanced testing patterns.

Files · 1

View on GitHub

SKILL.md

1	# Pytest Patterns Skill
2
3	You are an expert Python developer specializing in testing with pytest. When the user asks you to write, review, or debug pytest tests, follow these detailed instructions.
4
5	## Core Principles
6
7	1. Convention over configuration -- pytest discovers tests automatically by naming conventions.
8	2. Fixtures for setup -- Use fixtures instead of setUp/tearDown methods.
9	3. Parametrize for coverage -- Use `@pytest.mark.parametrize` for data-driven tests.
10	4. Descriptive test names -- Function names should describe the expected behavior.
11	5. Minimal test scope -- Each test verifies one behavior.
12
13	## Project Structure
14
15	```
16	project/
17	src/
18	myapp/
19	__init__.py
20	services/
21	user_service.py
22	order_service.py
23	models/
24	user.py
25	utils/
26	validators.py
27	tests/
28	__init__.py
29	conftest.py
30	unit/
31	__init__.py
32	test_user_service.py
33	test_validators.py
34	integration/
35	__init__.py
36	conftest.py
37	test_user_api.py
38	fixtures/
39	user_fixtures.py
40	pyproject.toml
41	pytest.ini
42	```
43
44	## Configuration
45
46	```ini
47	# pytest.ini
48	[pytest]
49	testpaths = tests
50	python_files = test_*.py
51	python_classes = Test*
52	python_functions = test_*
53	addopts = -v --tb=short --strict-markers
54	markers =
55	slow: marks tests as slow (deselect with '-m "not slow"')
56	integration: marks integration tests
57	smoke: marks smoke tests
58	unit: marks unit tests
59	```
60
61	```toml
62	# pyproject.toml
63	[tool.pytest.ini_options]
64	testpaths = ["tests"]
65	addopts = "-v --tb=short --strict-markers --cov=src --cov-report=term-missing"
66	markers = [
67	"slow: marks tests as slow",
68	"integration: marks integration tests",
69	"smoke: marks smoke tests",
70	]
71
72	[tool.coverage.run]
73	source = ["src"]
74	omit = ["tests/", "/__init__.py"]
75
76	[tool.coverage.report]
77	fail_under = 80
78	show_missing = true
79	```
80
81	## Fixtures
82
83	### Basic Fixtures
84
85	```python
86	# conftest.py
87	import pytest
88	from myapp.services.user_service import UserService
89	from myapp.models.user import User
90
91
92	@pytest.fixture
93	def sample_user():
94	"""Create a sample user for testing."""
95	return User(
96	id="user-123",
97	email="test@example.com",
98	name="Test User",
99	role="user",
100	)
101
102
103	@pytest.fixture
104	def admin_user():
105	"""Create an admin user for testing."""
106	return User(
107	id="admin-123",
108	email="admin@example.com",
109	name="Admin User",
110	role="admin",
111	)
112
113
114	@pytest.fixture
115	def user_service(mock_user_repo, mock_email_service):
116	"""Create UserService with mocked dependencies."""
117	return UserService(
118	user_repo=mock_user_repo,
119	email_service=mock_email_service,
120	)
121	```
122
123	### Fixture Scopes
124
125	```python
126	@pytest.fixture(scope="session")
127	def database_connection():
128	"""Create a database connection once for the entire test session."""
129	conn = create_connection("test_db")
130	yield conn
131	conn.close()
132
133
134	@pytest.fixture(scope="module")
135	def test_data(database_connection):
136	"""Seed test data once per module."""
137	seed_test_data(database_connection)
138	yield
139	cleanup_test_data(database_connection)
140
141
142	@pytest.fixture(scope="function") # default scope
143	def fresh_user():
144	"""Create a fresh user for each test function."""
145	return create_user(email=f"test-{uuid4()}@example.com")
146
147
148	@pytest.fixture(scope="class")
149	def shared_resource():
150	"""Share a resource across all methods in a test class."""
151	resource = create_expensive_resource()
152	yield resource
153	resource.cleanup()
154	```
155
156	### Fixture Factories
157
158	```python
159	@pytest.fixture
160	def make_user():
161	"""Factory fixture that creates users with custom attributes."""
162	created_users = []
163
164	def _make_user(
165	email: str = None,
166	name: str = "Test User",
167	role: str = "user",
168	) -> User:
169	user = User(
170	id=str(uuid4()),
171	email=email or f"test-{uuid4()}@example.com",
172	name=name,
173	role=role,
174	)
175	created_users.append(user)
176	return user
177
178	yield _make_user
179
180	# Cleanup
181	for user in created_users:
182	try:
183	delete_user(user.id)
184	except Exception:
185	pass
186
187
188	# Usage in tests
189	def test_admin_permissions(make_user):
190	admin = make_user(role="admin")
191	viewer = make_user(role="viewer")
192	assert admin.can_delete_users()
193	assert not viewer.can_delete_users()
194	```
195
196	### Yield Fixtures (Setup/Teardown)
197
198	```python
199	@pytest.fixture
200	def temp_file(tmp_path):
201	"""Create a temporary file and clean up after test."""
202	file_path = tmp_path / "test_data.json"
203	file_path.write_text('{"key": "value"}')
204	yield file_path
205	# Teardown happens automatica

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