217 lines
7.5 KiB
Python
217 lines
7.5 KiB
Python
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from __future__ import annotations
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from contextlib import (
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contextmanager,
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nullcontext,
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)
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import re
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import sys
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from typing import (
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Generator,
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Literal,
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Sequence,
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Type,
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cast,
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)
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import warnings
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@contextmanager
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def assert_produces_warning(
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expected_warning: type[Warning] | bool | tuple[type[Warning], ...] | None = Warning,
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filter_level: Literal[
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"error", "ignore", "always", "default", "module", "once"
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] = "always",
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check_stacklevel: bool = True,
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raise_on_extra_warnings: bool = True,
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match: str | None = None,
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) -> Generator[list[warnings.WarningMessage], None, None]:
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"""
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Context manager for running code expected to either raise a specific warning,
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multiple specific warnings, or not raise any warnings. Verifies that the code
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raises the expected warning(s), and that it does not raise any other unexpected
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warnings. It is basically a wrapper around ``warnings.catch_warnings``.
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Parameters
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----------
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expected_warning : {Warning, False, tuple[Warning, ...], None}, default Warning
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The type of Exception raised. ``exception.Warning`` is the base
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class for all warnings. To raise multiple types of exceptions,
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pass them as a tuple. To check that no warning is returned,
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specify ``False`` or ``None``.
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filter_level : str or None, default "always"
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Specifies whether warnings are ignored, displayed, or turned
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into errors.
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Valid values are:
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* "error" - turns matching warnings into exceptions
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* "ignore" - discard the warning
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* "always" - always emit a warning
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* "default" - print the warning the first time it is generated
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from each location
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* "module" - print the warning the first time it is generated
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from each module
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* "once" - print the warning the first time it is generated
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check_stacklevel : bool, default True
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If True, displays the line that called the function containing
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the warning to show were the function is called. Otherwise, the
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line that implements the function is displayed.
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raise_on_extra_warnings : bool, default True
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Whether extra warnings not of the type `expected_warning` should
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cause the test to fail.
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match : str, optional
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Match warning message.
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Examples
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--------
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>>> import warnings
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>>> with assert_produces_warning():
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... warnings.warn(UserWarning())
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...
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>>> with assert_produces_warning(False):
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... warnings.warn(RuntimeWarning())
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...
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Traceback (most recent call last):
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...
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AssertionError: Caused unexpected warning(s): ['RuntimeWarning'].
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>>> with assert_produces_warning(UserWarning):
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... warnings.warn(RuntimeWarning())
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Traceback (most recent call last):
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...
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AssertionError: Did not see expected warning of class 'UserWarning'.
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..warn:: This is *not* thread-safe.
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"""
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__tracebackhide__ = True
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with warnings.catch_warnings(record=True) as w:
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warnings.simplefilter(filter_level)
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try:
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yield w
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finally:
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if expected_warning:
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expected_warning = cast(Type[Warning], expected_warning)
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_assert_caught_expected_warning(
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caught_warnings=w,
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expected_warning=expected_warning,
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match=match,
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check_stacklevel=check_stacklevel,
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)
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if raise_on_extra_warnings:
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_assert_caught_no_extra_warnings(
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caught_warnings=w,
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expected_warning=expected_warning,
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)
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def maybe_produces_warning(warning: type[Warning], condition: bool, **kwargs):
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"""
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Return a context manager that possibly checks a warning based on the condition
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"""
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if condition:
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return assert_produces_warning(warning, **kwargs)
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else:
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return nullcontext()
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def _assert_caught_expected_warning(
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*,
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caught_warnings: Sequence[warnings.WarningMessage],
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expected_warning: type[Warning],
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match: str | None,
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check_stacklevel: bool,
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) -> None:
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"""Assert that there was the expected warning among the caught warnings."""
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saw_warning = False
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matched_message = False
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unmatched_messages = []
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for actual_warning in caught_warnings:
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if issubclass(actual_warning.category, expected_warning):
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saw_warning = True
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if check_stacklevel:
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_assert_raised_with_correct_stacklevel(actual_warning)
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if match is not None:
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if re.search(match, str(actual_warning.message)):
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matched_message = True
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else:
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unmatched_messages.append(actual_warning.message)
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if not saw_warning:
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raise AssertionError(
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f"Did not see expected warning of class "
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f"{repr(expected_warning.__name__)}"
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)
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if match and not matched_message:
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raise AssertionError(
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f"Did not see warning {repr(expected_warning.__name__)} "
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f"matching '{match}'. The emitted warning messages are "
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f"{unmatched_messages}"
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)
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def _assert_caught_no_extra_warnings(
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*,
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caught_warnings: Sequence[warnings.WarningMessage],
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expected_warning: type[Warning] | bool | tuple[type[Warning], ...] | None,
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) -> None:
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"""Assert that no extra warnings apart from the expected ones are caught."""
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extra_warnings = []
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for actual_warning in caught_warnings:
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if _is_unexpected_warning(actual_warning, expected_warning):
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# GH#38630 pytest.filterwarnings does not suppress these.
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if actual_warning.category == ResourceWarning:
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# GH 44732: Don't make the CI flaky by filtering SSL-related
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# ResourceWarning from dependencies
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if "unclosed <ssl.SSLSocket" in str(actual_warning.message):
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continue
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# GH 44844: Matplotlib leaves font files open during the entire process
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# upon import. Don't make CI flaky if ResourceWarning raised
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# due to these open files.
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if any("matplotlib" in mod for mod in sys.modules):
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continue
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extra_warnings.append(
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(
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actual_warning.category.__name__,
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actual_warning.message,
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actual_warning.filename,
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actual_warning.lineno,
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)
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)
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if extra_warnings:
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raise AssertionError(f"Caused unexpected warning(s): {repr(extra_warnings)}")
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def _is_unexpected_warning(
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actual_warning: warnings.WarningMessage,
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expected_warning: type[Warning] | bool | tuple[type[Warning], ...] | None,
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) -> bool:
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"""Check if the actual warning issued is unexpected."""
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if actual_warning and not expected_warning:
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return True
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expected_warning = cast(Type[Warning], expected_warning)
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return bool(not issubclass(actual_warning.category, expected_warning))
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def _assert_raised_with_correct_stacklevel(
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actual_warning: warnings.WarningMessage,
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) -> None:
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from inspect import (
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getframeinfo,
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stack,
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)
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caller = getframeinfo(stack()[4][0])
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msg = (
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"Warning not set with correct stacklevel. "
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f"File where warning is raised: {actual_warning.filename} != "
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f"{caller.filename}. Warning message: {actual_warning.message}"
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)
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assert actual_warning.filename == caller.filename, msg
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