Viewing file:  warnings.py (4.95 KB) -rw-r--r--
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import sys
import warnings
from contextlib import contextmanager
from typing import Generator
from typing import Optional
from typing import TYPE_CHECKING
import pytest
from _pytest.config import apply_warning_filters
from _pytest.config import Config
from _pytest.config import parse_warning_filter
from _pytest.main import Session
from _pytest.nodes import Item
from _pytest.terminal import TerminalReporter
if TYPE_CHECKING:
from typing_extensions import Literal
def pytest_configure(config: Config) -> None:
config.addinivalue_line(
"markers",
"filterwarnings(warning): add a warning filter to the given test. "
"see https://docs.pytest.org/en/stable/how-to/capture-warnings.html#pytest-mark-filterwarnings ",
)
@contextmanager
def catch_warnings_for_item(
config: Config,
ihook,
when: "Literal['config', 'collect', 'runtest']",
item: Optional[Item],
) -> Generator[None, None, None]:
"""Context manager that catches warnings generated in the contained execution block.
``item`` can be None if we are not in the context of an item execution.
Each warning captured triggers the ``pytest_warning_recorded`` hook.
"""
config_filters = config.getini("filterwarnings")
cmdline_filters = config.known_args_namespace.pythonwarnings or []
with warnings.catch_warnings(record=True) as log:
# mypy can't infer that record=True means log is not None; help it.
assert log is not None
if not sys.warnoptions:
# If user is not explicitly configuring warning filters, show deprecation warnings by default (#2908).
warnings.filterwarnings("always", category=DeprecationWarning)
warnings.filterwarnings("always", category=PendingDeprecationWarning)
apply_warning_filters(config_filters, cmdline_filters)
# apply filters from "filterwarnings" marks
nodeid = "" if item is None else item.nodeid
if item is not None:
for mark in item.iter_markers(name="filterwarnings"):
for arg in mark.args:
warnings.filterwarnings(*parse_warning_filter(arg, escape=False))
yield
for warning_message in log:
ihook.pytest_warning_recorded.call_historic(
kwargs=dict(
warning_message=warning_message,
nodeid=nodeid,
when=when,
location=None,
)
)
def warning_record_to_str(warning_message: warnings.WarningMessage) -> str:
"""Convert a warnings.WarningMessage to a string."""
warn_msg = warning_message.message
msg = warnings.formatwarning(
str(warn_msg),
warning_message.category,
warning_message.filename,
warning_message.lineno,
warning_message.line,
)
if warning_message.source is not None:
try:
import tracemalloc
except ImportError:
pass
else:
tb = tracemalloc.get_object_traceback(warning_message.source)
if tb is not None:
formatted_tb = "\n".join(tb.format())
# Use a leading new line to better separate the (large) output
# from the traceback to the previous warning text.
msg += f"\nObject allocated at:\n{formatted_tb}"
else:
# No need for a leading new line.
url = "https://docs.pytest.org/en/stable/how-to/capture-warnings.html#resource-warnings"
msg += "Enable tracemalloc to get traceback where the object was allocated.\n"
msg += f"See {url} for more info."
return msg
@pytest.hookimpl(hookwrapper=True, tryfirst=True)
def pytest_runtest_protocol(item: Item) -> Generator[None, None, None]:
with catch_warnings_for_item(
config=item.config, ihook=item.ihook, when="runtest", item=item
):
yield
@pytest.hookimpl(hookwrapper=True, tryfirst=True)
def pytest_collection(session: Session) -> Generator[None, None, None]:
config = session.config
with catch_warnings_for_item(
config=config, ihook=config.hook, when="collect", item=None
):
yield
@pytest.hookimpl(hookwrapper=True)
def pytest_terminal_summary(
terminalreporter: TerminalReporter,
) -> Generator[None, None, None]:
config = terminalreporter.config
with catch_warnings_for_item(
config=config, ihook=config.hook, when="config", item=None
):
yield
@pytest.hookimpl(hookwrapper=True)
def pytest_sessionfinish(session: Session) -> Generator[None, None, None]:
config = session.config
with catch_warnings_for_item(
config=config, ihook=config.hook, when="config", item=None
):
yield
@pytest.hookimpl(hookwrapper=True)
def pytest_load_initial_conftests(
early_config: "Config",
) -> Generator[None, None, None]:
with catch_warnings_for_item(
config=early_config, ihook=early_config.hook, when="config", item=None
):
yield
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