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Description:

pytestmypyplugins 3.1.2

pytest plugin for testing mypy types, stubs, and plugins

Installation
This package is available on PyPI
pip install pytest-mypy-plugins

and conda-forge
conda install -c conda-forge pytest-mypy-plugins

Usage
Running
Plugin, after installation, is automatically picked up by pytest therefore it is sufficient to
just execute:
pytest

Paths
The PYTHONPATH and MYPYPATH environment variables, if set, are passed to mypy on invocation.
This may be helpful if you are testing a local plugin and need to provide an import path to it.
Be aware that when mypy is run in a subprocess (the default) the test cases are run in temporary working directories
where relative paths such as PYTHONPATH=./my_plugin do not reference the directory which you are running pytest from.
If you encounter this, consider invoking pytest with --mypy-same-process or make your paths absolute,
e.g. PYTHONPATH=$(pwd)/my_plugin pytest.
You can also specify PYTHONPATH, MYPYPATH, or any other environment variable in env: section of yml spec:
- case: mypy_path_from_env
main: |
from pair import Pair

instance: Pair
reveal_type(instance) # N: Revealed type is 'pair.Pair'
env:
- MYPYPATH=../fixtures

What is a test case?
In general each test case is just an element in an array written in a properly formatted YAML file.
On top of that, each case must comply to following types:

Property
Type
Description

case
str
Name of the test case, complies to [a-zA-Z0-9] pattern

main
str
Portion of the code as if written in .py file

files
Optional[List[File]]=[]*
List of extra files to simulate imports if needed

disable_cache
Optional[bool]=False
Set to true disables mypy caching

mypy_config
Optional[str]
Inline mypy configuration, passed directly to mypy as --config-file option, possibly joined with --mypy-pyproject-toml-file or --mypy-ini-file contents if they are passed. By default is treated as ini, treated as toml only if --mypy-pyproject-toml-file is passed

env
Optional[Dict[str, str]]={}
Environmental variables to be provided inside of test run

parametrized
Optional[List[Parameter]]=[]*
List of parameters, similar to @pytest.mark.parametrize

skip
str
Expression evaluated with following globals set: sys, os, pytest and platform

expect_fail
bool
Mark test case as an expected failure, like @pytest.mark.xfail

regex
str
Allow regular expressions in comments to be matched against actual output. Defaults to "no", i.e. matches full text.

(*) Appendix to pseudo types used above:
class File:
path: str
content: Optional[str] = None
Parameter = Mapping[str, Any]

Implementation notes:

main must be non-empty string that evaluates to valid Python code,
content of each of extra files must evaluate to valid Python code,
parametrized entries must all be the objects of the same type. It simply means that each
entry must have exact same set of keys,
skip - an expression set in skip is passed directly into
eval. It is advised to take a peek and
learn about how eval works.

Repository also offers a JSONSchema, with which
it validates the input. It can also offer your editor auto-completions, descriptions, and validation.
All you have to do, add the following line at the top of your YAML file:
# yaml-language-server: $schema=https://raw.githubusercontent.com/typeddjango/pytest-mypy-plugins/master/pytest_mypy_plugins/schema.json

Example
1. Inline type expectations
# typesafety/test_request.yml
- case: request_object_has_user_of_type_auth_user_model
main: |
from django.http.request import HttpRequest
reveal_type(HttpRequest().user) # N: Revealed type is 'myapp.models.MyUser'
# check that other fields work ok
reveal_type(HttpRequest().method) # N: Revealed type is 'Union[builtins.str, None]'
files:
- path: myapp/__init__.py
- path: myapp/models.py
content: |
from django.db import models
class MyUser(models.Model):
pass

2. @parametrized
- case: with_params
parametrized:
- val: 1
rt: builtins.int
- val: 1.0
rt: builtins.float
main: |
reveal_type({{ val }}) # N: Revealed type is '{{ rt }}'

Properties that you can parametrize:

main
mypy_config
out

3. Longer type expectations
- case: with_out
main: |
reveal_type('abc')
out: |
main:1: note: Revealed type is 'builtins.str'

4. Regular expressions in expectations
- case: expected_message_regex_with_out
regex: yes
main: |
a = 'abc'
reveal_type(a)
out: |
main:2: note: .*str.*

5. Regular expressions specific lines of output.
- case: expected_single_message_regex
main: |
a = 'hello'
reveal_type(a) # NR: .*str.*

Options
mypy-tests:
--mypy-testing-base=MYPY_TESTING_BASE
Base directory for tests to use
--mypy-pyproject-toml-file=MYPY_PYPROJECT_TOML_FILE
Which `pyproject.toml` file to use
as a default config for tests.
Incompatible with `--mypy-ini-file`
--mypy-ini-file=MYPY_INI_FILE
Which `.ini` file to use as a default config for tests.
Incompatible with `--mypy-pyproject-toml-file`
--mypy-same-process
Run in the same process. Useful for debugging,
will create problems with import cache
--mypy-extension-hook=MYPY_EXTENSION_HOOK
Fully qualified path to the extension hook function,
in case you need custom yaml keys. Has to be top-level
--mypy-only-local-stub
mypy will ignore errors from site-packages
--mypy-closed-schema
Use closed schema to validate YAML test cases,
which won't allow any extra keys
(does not work well with `--mypy-extension-hook`)

Further reading

Testing mypy stubs, plugins, and types

License
MIT