pytest

what is it?

Following along with this series

Pytest is a testing framework for python. There’s also a version of pytest that caters for testing within the django framework.

Some general testing philosophy

Other python test frameworks

Robot
Unittest
DocTest
Nose2
Testify

Pytest pros

Opensource
Works with built-in Unittests
Simpler syntax than Unittests - less boilerplate code
Large community support
Large plugin ecosystem
Fixture support - simplifies setup and teardown

Installation and config

Base installation
```
pip install pytest-django
```

create pytest.ini file in project root

[pytest]
DJANGO_SETTINGS_MODULE = fica_face.settings
# define where tests are collected from
python_files = test_*.py *_tests.py

Writing a simple test

create test_example.py

import pytest
 
def test_example():
	assert 1 == 1

run test
remember to run from the project’s root directory
```
pytest
```

failed test

import pytest
 
def test_example():
	assert 1 == 1
 
def test_example1():
	assert 1 == 2

To stop testing after first failure: pytest -x
To log output from passing tests: pytest -rP
Running individual tests: pytest tests/test_ex1.py::test_example

Marks

pytest marks

Fixtures

pytest fixtures

Testing for an exception

import pytest
from common_functions.views import handle_exception
 
def test_handle_exception_raises_value_error():
    with pytest.raises(ValueError) as excinfo:
        handle_exception()
 
    # Optionally, you can assert further details about the exception if needed
    assert str(excinfo.value) == "An error occurred"

testing media using a temporary directory

@pytest.fixture(scope="function", autouse=True)
def tmp_media(tmpdir, settings):
    settings.MEDIA_ROOT = tmpdir.mkdir("media")

🦉 Knowledge Base

Explorer