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import os
import pathlib
import re
import sys
import warnings
import pytest
try:
from pytest import File as FileCollector
except ImportError:
from pytest.collect import File as FileCollector
version = tuple(sys.version_info[:2])
# Set MYPYPATH to the src directory relative to this conftest.py file. This
# allows mypy to find the source code for type checking.
_conftest_dir = pathlib.Path(__file__).parent
_src_dir = _conftest_dir.parent / "src"
os.environ["MYPYPATH"] = str(_src_dir)
class DummyCollector(FileCollector):
def collect(self):
return []
def construct_dummy(path, parent):
if hasattr(DummyCollector, "from_parent"):
item = DummyCollector.from_parent(parent, path=path)
return item
else:
return DummyCollector(path, parent=parent)
def pytest_pycollect_makemodule(module_path, parent):
basename = module_path.name
# Handle Python 2/3 general cases
if "_py2" in basename and version >= (3, 0):
return construct_dummy(module_path, parent)
if "_py3" in basename and version < (3, 0):
return construct_dummy(module_path, parent)
# Handle specific Python version cases using regex
# Match patterns like "_py33", "_py34", "_py310", etc.
version_match = re.search(r"_py(\d)(\d*)", basename)
if version_match:
major = int(version_match.group(1))
minor_str = version_match.group(2)
minor = int(minor_str) if minor_str else 0
# Check if current version is less than the required version
if version < (major, minor):
return construct_dummy(module_path, parent)
return None
# -----------------------------
# Custom mypy_*.py + .out tests
# -----------------------------
def run_custom_action(py_file: pathlib.Path) -> str:
"""
Run mypy on the given file with the current interpreter's major.minor version
and return the combined stdout/stderr output as text.
"""
import platform
import subprocess
major, minor = version
cmd = [
"mypy",
"--strict",
"--show-error-codes",
"--python-version",
f"{major}.{minor}",
str(py_file),
]
proc = subprocess.run(
cmd,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
text=True,
check=False,
)
output = proc.stdout
# On Windows, convert backslash paths to forward slashes for consistency
# with .out files
if platform.system() == "Windows":
output = re.sub(r"\btests\\mypy\\", "tests/mypy/", output)
return output
class MypyPairItem(pytest.Item):
def __init__(self, name, parent, py_path: pathlib.Path, out_path: pathlib.Path):
super().__init__(name, parent)
self.py_path = py_path
self.out_path = out_path
def runtest(self):
# Try to run mypy; if it's not found, skip the test
try:
actual_output = run_custom_action(self.py_path)
except FileNotFoundError:
warnings.warn(
f"mypy not found; skipping test {self.py_path.name}",
UserWarning,
stacklevel=2,
)
pytest.skip("mypy command not found")
expected_output = self.out_path.read_text(encoding="utf-8")
# Normalize line endings to avoid platform discrepancies
if actual_output.replace("\r\n", "\n") != expected_output.replace("\r\n", "\n"):
raise AssertionError(
f"Output did not match expected for {self.py_path.name}\n"
f"Expected (from {self.out_path.name}):\n{expected_output}\n"
f"Actual:\n{actual_output}"
)
def reportinfo(self):
return self.py_path, 0, f"mypy-pair: {self.py_path.name}"
class MypyPairCollector(pytest.File):
"""
A collector that discovers mypy*.py files with corresponding .out files in
the same directory and creates test items for them.
"""
def collect(self):
# Only run this custom collection on Python 3.10+
if version < (3, 10):
return
# Skip mypy tests if running on PyPy
if sys.implementation.name == "pypy":
return
path = pathlib.Path(str(self.fspath))
# Only operate in a tests directory context
if path.name != "conftest.py":
return
tests_dir = path.parent
for py_file in sorted(tests_dir.glob("mypy/mypy_*.py")):
out_file = py_file.with_suffix(".out")
if out_file.exists():
name = f"{py_file.stem}"
# Create a test item for the pair
yield MypyPairItem.from_parent(
parent=self, name=name, py_path=py_file, out_path=out_file
)
def pytest_collect_file(file_path, parent):
"""
Hook that allows adding our MypyPairCollector when pytest collects files.
We attach the collector to tests/conftest.py so the discovery runs once per tests session.
"""
# Guard early so we don't attach the collector on older Pythons
if version < (3, 10):
return
# Newer pytest passes pathlib.Path-like objects; ensure we can get a string/Path
try:
p = pathlib.Path(str(file_path))
except Exception:
p = pathlib.Path(getattr(file_path, "strpath", str(file_path)))
# Only hook our collector on the tests/conftest.py file to avoid multiple runs
if p.name == "conftest.py" and p.parent.name == "tests":
if hasattr(MypyPairCollector, "from_parent"):
return MypyPairCollector.from_parent(parent, path=file_path)
else:
# Fallback for very old pytest versions
return MypyPairCollector(file_path, parent=parent)
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