`pytest-revealtype-injector` is a `pytest` plugin for replacing [`reveal_type()`](https://docs.python.org/3/library/typing.html#typing.reveal_type) calls inside test functions as something more sophisticated. It does the following tasks in parallel:
- Launch external static type checkers (`basesdpyright`, `pyright` and `mypy`) and store `reveal_type` results.
- Use [`typeguard`](https://github.com/agronholm/typeguard) to verify the aforementioned static type checker result _really_ matches runtime code result.
## Usage
In short: install this plugin, create test functions which calls `reveal_type()` with variable or function return result, done.
### The longer story
This plugin would be automatically enabled when launching `pytest`.
For using `reveal_type()` inside tests, there is no boiler plate code involved. Import `reveal_type` normally, like:
```python
from typing import reveal_type
```
If you care about compatibility with older pythons, use:
```python
import sys
if sys.version >= (3, 11):
from typing import reveal_type
else:
from typing_extensions import reveal_type
```
Just importing `typing` (or `typing_extensions`) module is fine too:
```python
import typing
def test_something():
x: str = 1 # type: ignore # pyright: ignore
typing.reveal_type(x) # typeguard fails here
```
Since this plugin scans for `reveal_type()` for replacement under carpet, even `import ... as ...` syntax works:
```python
import typing as typ # or...
from typing import reveal_type as rt
```
### Limitations
But there are 3 caveats.
1. This plugin only searches for global import in test files, so local import inside test function doesn't work. That means following code doesn't utilize this plugin at all:
```python
def test_something():
from typing import reveal_type
x = 1
reveal_type(x) # calls vanilla reveal_type()
```
2. `reveal_type()` calls have to stay within a single line, although you can use `reveal_type` result in assertion or other purpose:
```python
x = "1"
assert reveal_type(str(int(x))) == x
```
3. This plugin does not enlist any type checker as dependency, because any of them can be optionally disabled with pytest marker (see below) or command line option. It is up to application or library authors to include suitable type checker(s) as dependency themselves.
## Disable type checker with marker
Using [pytest marker](https://docs.pytest.org/en/stable/example/markers.html), it is possible to disable usage of certain type checker for specific test. All 3 types of markers (function, class and module level) are supported.
Function level:
```python
@pytest.mark.notypechecker("mypy")
def test_something(self) -> None:
x = 1
reveal_type(x)
```
Class level:
```python
@pytest.mark.notypechecker("pyright")
class TestSomething:
def test_foo(self) -> None:
...
```
Module level:
```python
pytestmark = pytest.mark.notypechecker("basedpyright", "pyright")
```
Note that disabling all type checkers is disallowed, and such tests would be treated as `pytest.fail`. Disable the `reveal_type()` call instead.
## Logging
This plugin uses standard [`logging`](https://docs.python.org/3/library/logging.html) internally. `pytest -v` can be used to reveal `INFO` and `DEBUG` logs. Given following example:
```python
def test_superfluous(self) -> None:
x: list[str] = ['a', 'b', 'c', 1] # type: ignore # pyright: ignore
reveal_type(x)
```
Something like this will be shown as test result:
```
...
raise TypeCheckError(f"is not an instance of {qualified_name(origin_type)}")
E typeguard.TypeCheckError: item 3 is not an instance of str (from pyright)
------------------------------------------------------------- Captured log call -------------------------------------------------------------
INFO revealtype-injector:hooks.py:26 Replaced reveal_type() from global import with <function revealtype_injector at 0x00000238DB923D00>
DEBUG revealtype-injector:main.py:60 Extraction OK: code='reveal_type(x)', result='x'
========================================================== short test summary info ==========================================================
FAILED tests/runtime/test_attrib.py::TestAttrib::test_superfluous - typeguard.TypeCheckError: item 3 is not an instance of str (from pyright)
============================================================= 1 failed in 3.38s =============================================================
```
## History
This pytest plugin starts its life as part of testsuite related utilities within [`types-lxml`](https://github.com/abelcheung/types-lxml). As `lxml` is a `cython` project and probably never incorporate inline python annotation in future, there is need to compare runtime result to static type checker output for discrepancy. As time goes by, it starts to make sense to manage as an independent project.
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"description": "\n\n\n\n\n`pytest-revealtype-injector` is a `pytest` plugin for replacing [`reveal_type()`](https://docs.python.org/3/library/typing.html#typing.reveal_type) calls inside test functions as something more sophisticated. It does the following tasks in parallel:\n\n- Launch external static type checkers (`basesdpyright`, `pyright` and `mypy`) and store `reveal_type` results.\n- Use [`typeguard`](https://github.com/agronholm/typeguard) to verify the aforementioned static type checker result _really_ matches runtime code result.\n\n## Usage\n\nIn short: install this plugin, create test functions which calls `reveal_type()` with variable or function return result, done.\n\n### The longer story\n\nThis plugin would be automatically enabled when launching `pytest`.\n\nFor using `reveal_type()` inside tests, there is no boiler plate code involved. Import `reveal_type` normally, like:\n\n```python\nfrom typing import reveal_type\n```\n\nIf you care about compatibility with older pythons, use:\n\n```python\nimport sys\nif sys.version >= (3, 11):\n from typing import reveal_type\nelse:\n from typing_extensions import reveal_type\n```\n\nJust importing `typing` (or `typing_extensions`) module is fine too:\n\n```python\nimport typing\n\ndef test_something():\n x: str = 1 # type: ignore # pyright: ignore\n typing.reveal_type(x) # typeguard fails here\n```\n\nSince this plugin scans for `reveal_type()` for replacement under carpet, even `import ... as ...` syntax works:\n\n```python\nimport typing as typ # or...\nfrom typing import reveal_type as rt\n```\n\n### Limitations\n\nBut there are 3 caveats.\n\n1. This plugin only searches for global import in test files, so local import inside test function doesn't work. That means following code doesn't utilize this plugin at all:\n\n```python\ndef test_something():\n from typing import reveal_type\n x = 1\n reveal_type(x) # calls vanilla reveal_type()\n```\n\n2. `reveal_type()` calls have to stay within a single line, although you can use `reveal_type` result in assertion or other purpose:\n\n```python\nx = \"1\"\nassert reveal_type(str(int(x))) == x\n```\n\n3. This plugin does not enlist any type checker as dependency, because any of them can be optionally disabled with pytest marker (see below) or command line option. It is up to application or library authors to include suitable type checker(s) as dependency themselves.\n\n## Disable type checker with marker\n\nUsing [pytest marker](https://docs.pytest.org/en/stable/example/markers.html), it is possible to disable usage of certain type checker for specific test. All 3 types of markers (function, class and module level) are supported.\n\nFunction level:\n```python\n@pytest.mark.notypechecker(\"mypy\")\ndef test_something(self) -> None:\n x = 1\n reveal_type(x)\n```\n\nClass level:\n```python\n@pytest.mark.notypechecker(\"pyright\")\nclass TestSomething:\n def test_foo(self) -> None:\n ...\n```\n\nModule level:\n```python\npytestmark = pytest.mark.notypechecker(\"basedpyright\", \"pyright\")\n```\n\nNote that disabling all type checkers is disallowed, and such tests would be treated as `pytest.fail`. Disable the `reveal_type()` call instead.\n\n## Logging\n\nThis plugin uses standard [`logging`](https://docs.python.org/3/library/logging.html) internally. `pytest -v` can be used to reveal `INFO` and `DEBUG` logs. Given following example:\n\n```python\ndef test_superfluous(self) -> None:\n x: list[str] = ['a', 'b', 'c', 1] # type: ignore # pyright: ignore\n reveal_type(x)\n```\n\nSomething like this will be shown as test result:\n\n```\n...\n raise TypeCheckError(f\"is not an instance of {qualified_name(origin_type)}\")\nE typeguard.TypeCheckError: item 3 is not an instance of str (from pyright)\n------------------------------------------------------------- Captured log call -------------------------------------------------------------\nINFO revealtype-injector:hooks.py:26 Replaced reveal_type() from global import with <function revealtype_injector at 0x00000238DB923D00>\nDEBUG revealtype-injector:main.py:60 Extraction OK: code='reveal_type(x)', result='x'\n========================================================== short test summary info ==========================================================\nFAILED tests/runtime/test_attrib.py::TestAttrib::test_superfluous - typeguard.TypeCheckError: item 3 is not an instance of str (from pyright)\n============================================================= 1 failed in 3.38s =============================================================\n```\n\n\n## History\n\nThis pytest plugin starts its life as part of testsuite related utilities within [`types-lxml`](https://github.com/abelcheung/types-lxml). As `lxml` is a `cython` project and probably never incorporate inline python annotation in future, there is need to compare runtime result to static type checker output for discrepancy. As time goes by, it starts to make sense to manage as an independent project.\n",
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