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https://github.com/orsinium-labs/mypy-test
Test mypy plugins, stubs, custom types.
https://github.com/orsinium-labs/mypy-test
mypy python testing typing
Last synced: about 1 month ago
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Test mypy plugins, stubs, custom types.
- Host: GitHub
- URL: https://github.com/orsinium-labs/mypy-test
- Owner: orsinium-labs
- License: mit
- Created: 2021-07-15T09:05:36.000Z (over 3 years ago)
- Default Branch: master
- Last Pushed: 2023-10-24T12:35:46.000Z (about 1 year ago)
- Last Synced: 2024-04-22T12:32:39.750Z (8 months ago)
- Topics: mypy, python, testing, typing
- Language: Python
- Homepage:
- Size: 20.5 KB
- Stars: 5
- Watchers: 3
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-python-typing - mypy-test - Test mypy plugins, stubs, custom types. (Tools / Testing)
README
# mypy_test
Test [mypy](https://mypy.readthedocs.io/en/stable/) plugins, stubs, custom types.
Create a Python file, add comments to lines where you expect mypy to produce an error, run `mypy_test`, and it will check if actual errors are the same as you expect.
Features:
+ **Flexible**: supports every feature supported by mypy, does not enforce a project structure.
+ **Fast**: mypy gets run only once for all files at once. Also, no patching, no config generation.
+ **Easy to learn**: run `mypy_test` with the same arguments as you would run mypy, and it just works.
+ **Lightweight**: no dependencies except mypy.
```bash
python3 -m pip install mypy-test
```
## Usage
1. Write a file you want to test, add comments to the lines you expect to fail:
```python
a = 1
reveal_type(a) # R: builtins.int
```
2. Run the tool:
```bash
python3 -m mypy_test example.py
```
## Writing the comments
+ The comments have the following format: `SEVERITY: MESSAGE`.
+ Severity is a one-letter violation severity as reported by mypy.
+ `F` for "fatal"
+ `E` for "error"
+ `W` for "warning"
+ `N` for "note"
+ `R` is a shorthand for `N: Revealed type is "..."`
+ Comment can be on the same line as the violation or on the line before.
Example:
```python
var = 1.1
reveal_type(var) # R: builtins.float
# E: Incompatible types in assignment (expression has type "str", variable has type "float")
var = ""
```
Tips:
+ The fastest way to know the severity and the message is to run `mypy_test` on the code and then copy-paste the resulting message.
+ Make separate functions for every test case, so it can have a nice description and a clean namespace.
+ Place all test files into one directory. For example, `/types/` or `/tests/types/`.
## Alternatives
+ [pytest-mypy-plugins](https://github.com/typeddjango/pytest-mypy-plugins) - pytest plugin, test cases described in a YAML file.
+ [pytest-mypy-testing](https://github.com/davidfritzsche/pytest-mypy-testing) - pytest plugin, tests are described like pytest test cases (but they actually don't get run).