Source code for _pytest.config

# mypy: allow-untyped-defs
"""Command line options, ini-file and conftest.py processing."""
import argparse
import collections.abc
import copy
import dataclasses
import enum
from functools import lru_cache
import glob
import importlib.metadata
import inspect
import os
from pathlib import Path
import re
import shlex
import sys
from textwrap import dedent
import types
from types import FunctionType
from typing import Any
from typing import Callable
from typing import cast
from typing import Dict
from typing import Final
from typing import final
from typing import Generator
from typing import IO
from typing import Iterable
from typing import Iterator
from typing import List
from typing import Optional
from typing import Sequence
from typing import Set
from typing import TextIO
from typing import Tuple
from typing import Type
from typing import TYPE_CHECKING
from typing import Union
import warnings

from pluggy import HookimplMarker
from pluggy import HookimplOpts
from pluggy import HookspecMarker
from pluggy import HookspecOpts
from pluggy import PluginManager

from .exceptions import PrintHelp as PrintHelp
from .exceptions import UsageError as UsageError
from .findpaths import determine_setup
import _pytest._code
from _pytest._code import ExceptionInfo
from _pytest._code import filter_traceback
from _pytest._io import TerminalWriter
import _pytest.deprecated
import _pytest.hookspec
from _pytest.outcomes import fail
from _pytest.outcomes import Skipped
from _pytest.pathlib import absolutepath
from _pytest.pathlib import bestrelpath
from _pytest.pathlib import import_path
from _pytest.pathlib import ImportMode
from _pytest.pathlib import resolve_package_path
from _pytest.pathlib import safe_exists
from _pytest.stash import Stash
from _pytest.warning_types import PytestConfigWarning
from _pytest.warning_types import warn_explicit_for


if TYPE_CHECKING:
    from .argparsing import Argument
    from .argparsing import Parser
    from _pytest._code.code import _TracebackStyle
    from _pytest.terminal import TerminalReporter


_PluggyPlugin = object
"""A type to represent plugin objects.

Plugins can be any namespace, so we can't narrow it down much, but we use an
alias to make the intent clear.

Ideally this type would be provided by pluggy itself.
"""


hookimpl = HookimplMarker("pytest")
hookspec = HookspecMarker("pytest")


[docs] @final class ExitCode(enum.IntEnum): """Encodes the valid exit codes by pytest. Currently users and plugins may supply other exit codes as well. .. versionadded:: 5.0 """ #: Tests passed. OK = 0 #: Tests failed. TESTS_FAILED = 1 #: pytest was interrupted. INTERRUPTED = 2 #: An internal error got in the way. INTERNAL_ERROR = 3 #: pytest was misused. USAGE_ERROR = 4 #: pytest couldn't find tests. NO_TESTS_COLLECTED = 5
class ConftestImportFailure(Exception): def __init__( self, path: Path, *, cause: Exception, ) -> None: self.path = path self.cause = cause def __str__(self) -> str: return f"{type(self.cause).__name__}: {self.cause} (from {self.path})" def filter_traceback_for_conftest_import_failure( entry: _pytest._code.TracebackEntry, ) -> bool: """Filter tracebacks entries which point to pytest internals or importlib. Make a special case for importlib because we use it to import test modules and conftest files in _pytest.pathlib.import_path. """ return filter_traceback(entry) and "importlib" not in str(entry.path).split(os.sep)
[docs] def main( args: Optional[Union[List[str], "os.PathLike[str]"]] = None, plugins: Optional[Sequence[Union[str, _PluggyPlugin]]] = None, ) -> Union[int, ExitCode]: """Perform an in-process test run. :param args: List of command line arguments. If `None` or not given, defaults to reading arguments directly from the process command line (:data:`sys.argv`). :param plugins: List of plugin objects to be auto-registered during initialization. :returns: An exit code. """ try: try: config = _prepareconfig(args, plugins) except ConftestImportFailure as e: exc_info = ExceptionInfo.from_exception(e.cause) tw = TerminalWriter(sys.stderr) tw.line(f"ImportError while loading conftest '{e.path}'.", red=True) exc_info.traceback = exc_info.traceback.filter( filter_traceback_for_conftest_import_failure ) exc_repr = ( exc_info.getrepr(style="short", chain=False) if exc_info.traceback else exc_info.exconly() ) formatted_tb = str(exc_repr) for line in formatted_tb.splitlines(): tw.line(line.rstrip(), red=True) return ExitCode.USAGE_ERROR else: try: ret: Union[ExitCode, int] = config.hook.pytest_cmdline_main( config=config ) try: return ExitCode(ret) except ValueError: return ret finally: config._ensure_unconfigure() except UsageError as e: tw = TerminalWriter(sys.stderr) for msg in e.args: tw.line(f"ERROR: {msg}\n", red=True) return ExitCode.USAGE_ERROR
def console_main() -> int: """The CLI entry point of pytest. This function is not meant for programmable use; use `main()` instead. """ # https://docs.python.org/3/library/signal.html#note-on-sigpipe try: code = main() sys.stdout.flush() return code except BrokenPipeError: # Python flushes standard streams on exit; redirect remaining output # to devnull to avoid another BrokenPipeError at shutdown devnull = os.open(os.devnull, os.O_WRONLY) os.dup2(devnull, sys.stdout.fileno()) return 1 # Python exits with error code 1 on EPIPE class cmdline: # compatibility namespace main = staticmethod(main) def filename_arg(path: str, optname: str) -> str: """Argparse type validator for filename arguments. :path: Path of filename. :optname: Name of the option. """ if os.path.isdir(path): raise UsageError(f"{optname} must be a filename, given: {path}") return path def directory_arg(path: str, optname: str) -> str: """Argparse type validator for directory arguments. :path: Path of directory. :optname: Name of the option. """ if not os.path.isdir(path): raise UsageError(f"{optname} must be a directory, given: {path}") return path # Plugins that cannot be disabled via "-p no:X" currently. essential_plugins = ( "mark", "main", "runner", "fixtures", "helpconfig", # Provides -p. ) default_plugins = ( *essential_plugins, "python", "terminal", "debugging", "unittest", "capture", "skipping", "legacypath", "tmpdir", "monkeypatch", "recwarn", "pastebin", "assertion", "junitxml", "doctest", "cacheprovider", "freeze_support", "setuponly", "setupplan", "stepwise", "warnings", "logging", "reports", "python_path", "unraisableexception", "threadexception", "faulthandler", ) builtin_plugins = set(default_plugins) builtin_plugins.add("pytester") builtin_plugins.add("pytester_assertions") def get_config( args: Optional[List[str]] = None, plugins: Optional[Sequence[Union[str, _PluggyPlugin]]] = None, ) -> "Config": # subsequent calls to main will create a fresh instance pluginmanager = PytestPluginManager() config = Config( pluginmanager, invocation_params=Config.InvocationParams( args=args or (), plugins=plugins, dir=Path.cwd(), ), ) if args is not None: # Handle any "-p no:plugin" args. pluginmanager.consider_preparse(args, exclude_only=True) for spec in default_plugins: pluginmanager.import_plugin(spec) return config def get_plugin_manager() -> "PytestPluginManager": """Obtain a new instance of the :py:class:`pytest.PytestPluginManager`, with default plugins already loaded. This function can be used by integration with other tools, like hooking into pytest to run tests into an IDE. """ return get_config().pluginmanager def _prepareconfig( args: Optional[Union[List[str], "os.PathLike[str]"]] = None, plugins: Optional[Sequence[Union[str, _PluggyPlugin]]] = None, ) -> "Config": if args is None: args = sys.argv[1:] elif isinstance(args, os.PathLike): args = [os.fspath(args)] elif not isinstance(args, list): msg = ( # type:ignore[unreachable] "`args` parameter expected to be a list of strings, got: {!r} (type: {})" ) raise TypeError(msg.format(args, type(args))) config = get_config(args, plugins) pluginmanager = config.pluginmanager try: if plugins: for plugin in plugins: if isinstance(plugin, str): pluginmanager.consider_pluginarg(plugin) else: pluginmanager.register(plugin) config = pluginmanager.hook.pytest_cmdline_parse( pluginmanager=pluginmanager, args=args ) return config except BaseException: config._ensure_unconfigure() raise def _get_directory(path: Path) -> Path: """Get the directory of a path - itself if already a directory.""" if path.is_file(): return path.parent else: return path def _get_legacy_hook_marks( method: Any, hook_type: str, opt_names: Tuple[str, ...], ) -> Dict[str, bool]: if TYPE_CHECKING: # abuse typeguard from importlib to avoid massive method type union thats lacking a alias assert inspect.isroutine(method) known_marks: Set[str] = {m.name for m in getattr(method, "pytestmark", [])} must_warn: List[str] = [] opts: Dict[str, bool] = {} for opt_name in opt_names: opt_attr = getattr(method, opt_name, AttributeError) if opt_attr is not AttributeError: must_warn.append(f"{opt_name}={opt_attr}") opts[opt_name] = True elif opt_name in known_marks: must_warn.append(f"{opt_name}=True") opts[opt_name] = True else: opts[opt_name] = False if must_warn: hook_opts = ", ".join(must_warn) message = _pytest.deprecated.HOOK_LEGACY_MARKING.format( type=hook_type, fullname=method.__qualname__, hook_opts=hook_opts, ) warn_explicit_for(cast(FunctionType, method), message) return opts
[docs] @final class PytestPluginManager(PluginManager): """A :py:class:`pluggy.PluginManager <pluggy.PluginManager>` with additional pytest-specific functionality: * Loading plugins from the command line, ``PYTEST_PLUGINS`` env variable and ``pytest_plugins`` global variables found in plugins being loaded. * ``conftest.py`` loading during start-up. """ def __init__(self) -> None: import _pytest.assertion super().__init__("pytest") # -- State related to local conftest plugins. # All loaded conftest modules. self._conftest_plugins: Set[types.ModuleType] = set() # All conftest modules applicable for a directory. # This includes the directory's own conftest modules as well # as those of its parent directories. self._dirpath2confmods: Dict[Path, List[types.ModuleType]] = {} # Cutoff directory above which conftests are no longer discovered. self._confcutdir: Optional[Path] = None # If set, conftest loading is skipped. self._noconftest = False # _getconftestmodules()'s call to _get_directory() causes a stat # storm when it's called potentially thousands of times in a test # session (#9478), often with the same path, so cache it. self._get_directory = lru_cache(256)(_get_directory) # plugins that were explicitly skipped with pytest.skip # list of (module name, skip reason) # previously we would issue a warning when a plugin was skipped, but # since we refactored warnings as first citizens of Config, they are # just stored here to be used later. self.skipped_plugins: List[Tuple[str, str]] = [] self.add_hookspecs(_pytest.hookspec) self.register(self) if os.environ.get("PYTEST_DEBUG"): err: IO[str] = sys.stderr encoding: str = getattr(err, "encoding", "utf8") try: err = open( os.dup(err.fileno()), mode=err.mode, buffering=1, encoding=encoding, ) except Exception: pass self.trace.root.setwriter(err.write) self.enable_tracing() # Config._consider_importhook will set a real object if required. self.rewrite_hook = _pytest.assertion.DummyRewriteHook() # Used to know when we are importing conftests after the pytest_configure stage. self._configured = False def parse_hookimpl_opts( self, plugin: _PluggyPlugin, name: str ) -> Optional[HookimplOpts]: """:meta private:""" # pytest hooks are always prefixed with "pytest_", # so we avoid accessing possibly non-readable attributes # (see issue #1073). if not name.startswith("pytest_"): return None # Ignore names which can not be hooks. if name == "pytest_plugins": return None opts = super().parse_hookimpl_opts(plugin, name) if opts is not None: return opts method = getattr(plugin, name) # Consider only actual functions for hooks (#3775). if not inspect.isroutine(method): return None # Collect unmarked hooks as long as they have the `pytest_' prefix. return _get_legacy_hook_marks( # type: ignore[return-value] method, "impl", ("tryfirst", "trylast", "optionalhook", "hookwrapper") ) def parse_hookspec_opts(self, module_or_class, name: str) -> Optional[HookspecOpts]: """:meta private:""" opts = super().parse_hookspec_opts(module_or_class, name) if opts is None: method = getattr(module_or_class, name) if name.startswith("pytest_"): opts = _get_legacy_hook_marks( # type: ignore[assignment] method, "spec", ("firstresult", "historic"), ) return opts
[docs] def register( self, plugin: _PluggyPlugin, name: Optional[str] = None ) -> Optional[str]: if name in _pytest.deprecated.DEPRECATED_EXTERNAL_PLUGINS: warnings.warn( PytestConfigWarning( "{} plugin has been merged into the core, " "please remove it from your requirements.".format( name.replace("_", "-") ) ) ) return None plugin_name = super().register(plugin, name) if plugin_name is not None: self.hook.pytest_plugin_registered.call_historic( kwargs=dict( plugin=plugin, plugin_name=plugin_name, manager=self, ) ) if isinstance(plugin, types.ModuleType): self.consider_module(plugin) return plugin_name
[docs] def getplugin(self, name: str): # Support deprecated naming because plugins (xdist e.g.) use it. plugin: Optional[_PluggyPlugin] = self.get_plugin(name) return plugin
[docs] def hasplugin(self, name: str) -> bool: """Return whether a plugin with the given name is registered.""" return bool(self.get_plugin(name))
def pytest_configure(self, config: "Config") -> None: """:meta private:""" # XXX now that the pluginmanager exposes hookimpl(tryfirst...) # we should remove tryfirst/trylast as markers. config.addinivalue_line( "markers", "tryfirst: mark a hook implementation function such that the " "plugin machinery will try to call it first/as early as possible. " "DEPRECATED, use @pytest.hookimpl(tryfirst=True) instead.", ) config.addinivalue_line( "markers", "trylast: mark a hook implementation function such that the " "plugin machinery will try to call it last/as late as possible. " "DEPRECATED, use @pytest.hookimpl(trylast=True) instead.", ) self._configured = True # # Internal API for local conftest plugin handling. # def _set_initial_conftests( self, args: Sequence[Union[str, Path]], pyargs: bool, noconftest: bool, rootpath: Path, confcutdir: Optional[Path], invocation_dir: Path, importmode: Union[ImportMode, str], *, consider_namespace_packages: bool, ) -> None: """Load initial conftest files given a preparsed "namespace". As conftest files may add their own command line options which have arguments ('--my-opt somepath') we might get some false positives. All builtin and 3rd party plugins will have been loaded, however, so common options will not confuse our logic here. """ self._confcutdir = ( absolutepath(invocation_dir / confcutdir) if confcutdir else None ) self._noconftest = noconftest self._using_pyargs = pyargs foundanchor = False for intitial_path in args: path = str(intitial_path) # remove node-id syntax i = path.find("::") if i != -1: path = path[:i] anchor = absolutepath(invocation_dir / path) # Ensure we do not break if what appears to be an anchor # is in fact a very long option (#10169, #11394). if safe_exists(anchor): self._try_load_conftest( anchor, importmode, rootpath, consider_namespace_packages=consider_namespace_packages, ) foundanchor = True if not foundanchor: self._try_load_conftest( invocation_dir, importmode, rootpath, consider_namespace_packages=consider_namespace_packages, ) def _is_in_confcutdir(self, path: Path) -> bool: """Whether to consider the given path to load conftests from.""" if self._confcutdir is None: return True # The semantics here are literally: # Do not load a conftest if it is found upwards from confcut dir. # But this is *not* the same as: # Load only conftests from confcutdir or below. # At first glance they might seem the same thing, however we do support use cases where # we want to load conftests that are not found in confcutdir or below, but are found # in completely different directory hierarchies like packages installed # in out-of-source trees. # (see #9767 for a regression where the logic was inverted). return path not in self._confcutdir.parents def _try_load_conftest( self, anchor: Path, importmode: Union[str, ImportMode], rootpath: Path, *, consider_namespace_packages: bool, ) -> None: self._loadconftestmodules( anchor, importmode, rootpath, consider_namespace_packages=consider_namespace_packages, ) # let's also consider test* subdirs if anchor.is_dir(): for x in anchor.glob("test*"): if x.is_dir(): self._loadconftestmodules( x, importmode, rootpath, consider_namespace_packages=consider_namespace_packages, ) def _loadconftestmodules( self, path: Path, importmode: Union[str, ImportMode], rootpath: Path, *, consider_namespace_packages: bool, ) -> None: if self._noconftest: return directory = self._get_directory(path) # Optimization: avoid repeated searches in the same directory. # Assumes always called with same importmode and rootpath. if directory in self._dirpath2confmods: return clist = [] for parent in reversed((directory, *directory.parents)): if self._is_in_confcutdir(parent): conftestpath = parent / "conftest.py" if conftestpath.is_file(): mod = self._importconftest( conftestpath, importmode, rootpath, consider_namespace_packages=consider_namespace_packages, ) clist.append(mod) self._dirpath2confmods[directory] = clist def _getconftestmodules(self, path: Path) -> Sequence[types.ModuleType]: directory = self._get_directory(path) return self._dirpath2confmods.get(directory, ()) def _rget_with_confmod( self, name: str, path: Path, ) -> Tuple[types.ModuleType, Any]: modules = self._getconftestmodules(path) for mod in reversed(modules): try: return mod, getattr(mod, name) except AttributeError: continue raise KeyError(name) def _importconftest( self, conftestpath: Path, importmode: Union[str, ImportMode], rootpath: Path, *, consider_namespace_packages: bool, ) -> types.ModuleType: conftestpath_plugin_name = str(conftestpath) existing = self.get_plugin(conftestpath_plugin_name) if existing is not None: return cast(types.ModuleType, existing) # conftest.py files there are not in a Python package all have module # name "conftest", and thus conflict with each other. Clear the existing # before loading the new one, otherwise the existing one will be # returned from the module cache. pkgpath = resolve_package_path(conftestpath) if pkgpath is None: try: del sys.modules[conftestpath.stem] except KeyError: pass try: mod = import_path( conftestpath, mode=importmode, root=rootpath, consider_namespace_packages=consider_namespace_packages, ) except Exception as e: assert e.__traceback__ is not None raise ConftestImportFailure(conftestpath, cause=e) from e self._check_non_top_pytest_plugins(mod, conftestpath) self._conftest_plugins.add(mod) dirpath = conftestpath.parent if dirpath in self._dirpath2confmods: for path, mods in self._dirpath2confmods.items(): if dirpath in path.parents or path == dirpath: if mod in mods: raise AssertionError( f"While trying to load conftest path {conftestpath!s}, " f"found that the module {mod} is already loaded with path {mod.__file__}. " "This is not supposed to happen. Please report this issue to pytest." ) mods.append(mod) self.trace(f"loading conftestmodule {mod!r}") self.consider_conftest(mod, registration_name=conftestpath_plugin_name) return mod def _check_non_top_pytest_plugins( self, mod: types.ModuleType, conftestpath: Path, ) -> None: if ( hasattr(mod, "pytest_plugins") and self._configured and not self._using_pyargs ): msg = ( "Defining 'pytest_plugins' in a non-top-level conftest is no longer supported:\n" "It affects the entire test suite instead of just below the conftest as expected.\n" " {}\n" "Please move it to a top level conftest file at the rootdir:\n" " {}\n" "For more information, visit:\n" " https://docs.pytest.org/en/stable/deprecations.html#pytest-plugins-in-non-top-level-conftest-files" ) fail(msg.format(conftestpath, self._confcutdir), pytrace=False) # # API for bootstrapping plugin loading # # def consider_preparse( self, args: Sequence[str], *, exclude_only: bool = False ) -> None: """:meta private:""" i = 0 n = len(args) while i < n: opt = args[i] i += 1 if isinstance(opt, str): if opt == "-p": try: parg = args[i] except IndexError: return i += 1 elif opt.startswith("-p"): parg = opt[2:] else: continue parg = parg.strip() if exclude_only and not parg.startswith("no:"): continue self.consider_pluginarg(parg) def consider_pluginarg(self, arg: str) -> None: """:meta private:""" if arg.startswith("no:"): name = arg[3:] if name in essential_plugins: raise UsageError("plugin %s cannot be disabled" % name) # PR #4304: remove stepwise if cacheprovider is blocked. if name == "cacheprovider": self.set_blocked("stepwise") self.set_blocked("pytest_stepwise") self.set_blocked(name) if not name.startswith("pytest_"): self.set_blocked("pytest_" + name) else: name = arg # Unblock the plugin. self.unblock(name) if not name.startswith("pytest_"): self.unblock("pytest_" + name) self.import_plugin(arg, consider_entry_points=True) def consider_conftest( self, conftestmodule: types.ModuleType, registration_name: str ) -> None: """:meta private:""" self.register(conftestmodule, name=registration_name) def consider_env(self) -> None: """:meta private:""" self._import_plugin_specs(os.environ.get("PYTEST_PLUGINS")) def consider_module(self, mod: types.ModuleType) -> None: """:meta private:""" self._import_plugin_specs(getattr(mod, "pytest_plugins", [])) def _import_plugin_specs( self, spec: Union[None, types.ModuleType, str, Sequence[str]] ) -> None: plugins = _get_plugin_specs_as_list(spec) for import_spec in plugins: self.import_plugin(import_spec)
[docs] def import_plugin(self, modname: str, consider_entry_points: bool = False) -> None: """Import a plugin with ``modname``. If ``consider_entry_points`` is True, entry point names are also considered to find a plugin. """ # Most often modname refers to builtin modules, e.g. "pytester", # "terminal" or "capture". Those plugins are registered under their # basename for historic purposes but must be imported with the # _pytest prefix. assert isinstance(modname, str), ( "module name as text required, got %r" % modname ) if self.is_blocked(modname) or self.get_plugin(modname) is not None: return importspec = "_pytest." + modname if modname in builtin_plugins else modname self.rewrite_hook.mark_rewrite(importspec) if consider_entry_points: loaded = self.load_setuptools_entrypoints("pytest11", name=modname) if loaded: return try: __import__(importspec) except ImportError as e: raise ImportError( f'Error importing plugin "{modname}": {e.args[0]}' ).with_traceback(e.__traceback__) from e except Skipped as e: self.skipped_plugins.append((modname, e.msg or "")) else: mod = sys.modules[importspec] self.register(mod, modname)
def _get_plugin_specs_as_list( specs: Union[None, types.ModuleType, str, Sequence[str]], ) -> List[str]: """Parse a plugins specification into a list of plugin names.""" # None means empty. if specs is None: return [] # Workaround for #3899 - a submodule which happens to be called "pytest_plugins". if isinstance(specs, types.ModuleType): return [] # Comma-separated list. if isinstance(specs, str): return specs.split(",") if specs else [] # Direct specification. if isinstance(specs, collections.abc.Sequence): return list(specs) raise UsageError( "Plugins may be specified as a sequence or a ','-separated string of plugin names. Got: %r" % specs ) class Notset: def __repr__(self): return "<NOTSET>" notset = Notset() def _iter_rewritable_modules(package_files: Iterable[str]) -> Iterator[str]: """Given an iterable of file names in a source distribution, return the "names" that should be marked for assertion rewrite. For example the package "pytest_mock/__init__.py" should be added as "pytest_mock" in the assertion rewrite mechanism. This function has to deal with dist-info based distributions and egg based distributions (which are still very much in use for "editable" installs). Here are the file names as seen in a dist-info based distribution: pytest_mock/__init__.py pytest_mock/_version.py pytest_mock/plugin.py pytest_mock.egg-info/PKG-INFO Here are the file names as seen in an egg based distribution: src/pytest_mock/__init__.py src/pytest_mock/_version.py src/pytest_mock/plugin.py src/pytest_mock.egg-info/PKG-INFO LICENSE setup.py We have to take in account those two distribution flavors in order to determine which names should be considered for assertion rewriting. More information: https://github.com/pytest-dev/pytest-mock/issues/167 """ package_files = list(package_files) seen_some = False for fn in package_files: is_simple_module = "/" not in fn and fn.endswith(".py") is_package = fn.count("/") == 1 and fn.endswith("__init__.py") if is_simple_module: module_name, _ = os.path.splitext(fn) # we ignore "setup.py" at the root of the distribution # as well as editable installation finder modules made by setuptools if module_name != "setup" and not module_name.startswith("__editable__"): seen_some = True yield module_name elif is_package: package_name = os.path.dirname(fn) seen_some = True yield package_name if not seen_some: # At this point we did not find any packages or modules suitable for assertion # rewriting, so we try again by stripping the first path component (to account for # "src" based source trees for example). # This approach lets us have the common case continue to be fast, as egg-distributions # are rarer. new_package_files = [] for fn in package_files: parts = fn.split("/") new_fn = "/".join(parts[1:]) if new_fn: new_package_files.append(new_fn) if new_package_files: yield from _iter_rewritable_modules(new_package_files)
[docs] @final class Config: """Access to configuration values, pluginmanager and plugin hooks. :param PytestPluginManager pluginmanager: A pytest PluginManager. :param InvocationParams invocation_params: Object containing parameters regarding the :func:`pytest.main` invocation. """
[docs] @final @dataclasses.dataclass(frozen=True) class InvocationParams: """Holds parameters passed during :func:`pytest.main`. The object attributes are read-only. .. versionadded:: 5.1 .. note:: Note that the environment variable ``PYTEST_ADDOPTS`` and the ``addopts`` ini option are handled by pytest, not being included in the ``args`` attribute. Plugins accessing ``InvocationParams`` must be aware of that. """ args: Tuple[str, ...] """The command-line arguments as passed to :func:`pytest.main`.""" plugins: Optional[Sequence[Union[str, _PluggyPlugin]]] """Extra plugins, might be `None`.""" dir: Path """The directory from which :func:`pytest.main` was invoked.""" def __init__( self, *, args: Iterable[str], plugins: Optional[Sequence[Union[str, _PluggyPlugin]]], dir: Path, ) -> None: object.__setattr__(self, "args", tuple(args)) object.__setattr__(self, "plugins", plugins) object.__setattr__(self, "dir", dir)
[docs] class ArgsSource(enum.Enum): """Indicates the source of the test arguments. .. versionadded:: 7.2 """ #: Command line arguments. ARGS = enum.auto() #: Invocation directory. INVOCATION_DIR = enum.auto() INCOVATION_DIR = INVOCATION_DIR # backwards compatibility alias #: 'testpaths' configuration value. TESTPATHS = enum.auto()
def __init__( self, pluginmanager: PytestPluginManager, *, invocation_params: Optional[InvocationParams] = None, ) -> None: from .argparsing import FILE_OR_DIR from .argparsing import Parser if invocation_params is None: invocation_params = self.InvocationParams( args=(), plugins=None, dir=Path.cwd() ) self.option = argparse.Namespace() """Access to command line option as attributes. :type: argparse.Namespace """ self.invocation_params = invocation_params """The parameters with which pytest was invoked. :type: InvocationParams """ _a = FILE_OR_DIR self._parser = Parser( usage=f"%(prog)s [options] [{_a}] [{_a}] [...]", processopt=self._processopt, _ispytest=True, ) self.pluginmanager = pluginmanager """The plugin manager handles plugin registration and hook invocation. :type: PytestPluginManager """ self.stash = Stash() """A place where plugins can store information on the config for their own use. :type: Stash """ # Deprecated alias. Was never public. Can be removed in a few releases. self._store = self.stash self.trace = self.pluginmanager.trace.root.get("config") self.hook = self.pluginmanager.hook # type: ignore[assignment] self._inicache: Dict[str, Any] = {} self._override_ini: Sequence[str] = () self._opt2dest: Dict[str, str] = {} self._cleanup: List[Callable[[], None]] = [] self.pluginmanager.register(self, "pytestconfig") self._configured = False self.hook.pytest_addoption.call_historic( kwargs=dict(parser=self._parser, pluginmanager=self.pluginmanager) ) self.args_source = Config.ArgsSource.ARGS self.args: List[str] = [] if TYPE_CHECKING: from _pytest.cacheprovider import Cache self.cache: Optional[Cache] = None @property def rootpath(self) -> Path: """The path to the :ref:`rootdir <rootdir>`. :type: pathlib.Path .. versionadded:: 6.1 """ return self._rootpath @property def inipath(self) -> Optional[Path]: """The path to the :ref:`configfile <configfiles>`. :type: Optional[pathlib.Path] .. versionadded:: 6.1 """ return self._inipath
[docs] def add_cleanup(self, func: Callable[[], None]) -> None: """Add a function to be called when the config object gets out of use (usually coinciding with pytest_unconfigure).""" self._cleanup.append(func)
def _do_configure(self) -> None: assert not self._configured self._configured = True with warnings.catch_warnings(): warnings.simplefilter("default") self.hook.pytest_configure.call_historic(kwargs=dict(config=self)) def _ensure_unconfigure(self) -> None: if self._configured: self._configured = False self.hook.pytest_unconfigure(config=self) self.hook.pytest_configure._call_history = [] while self._cleanup: fin = self._cleanup.pop() fin() def get_terminal_writer(self) -> TerminalWriter: terminalreporter: Optional[TerminalReporter] = self.pluginmanager.get_plugin( "terminalreporter" ) assert terminalreporter is not None return terminalreporter._tw def pytest_cmdline_parse( self, pluginmanager: PytestPluginManager, args: List[str] ) -> "Config": try: self.parse(args) except UsageError: # Handle --version and --help here in a minimal fashion. # This gets done via helpconfig normally, but its # pytest_cmdline_main is not called in case of errors. if getattr(self.option, "version", False) or "--version" in args: from _pytest.helpconfig import showversion showversion(self) elif ( getattr(self.option, "help", False) or "--help" in args or "-h" in args ): self._parser._getparser().print_help() sys.stdout.write( "\nNOTE: displaying only minimal help due to UsageError.\n\n" ) raise return self def notify_exception( self, excinfo: ExceptionInfo[BaseException], option: Optional[argparse.Namespace] = None, ) -> None: if option and getattr(option, "fulltrace", False): style: _TracebackStyle = "long" else: style = "native" excrepr = excinfo.getrepr( funcargs=True, showlocals=getattr(option, "showlocals", False), style=style ) res = self.hook.pytest_internalerror(excrepr=excrepr, excinfo=excinfo) if not any(res): for line in str(excrepr).split("\n"): sys.stderr.write("INTERNALERROR> %s\n" % line) sys.stderr.flush() def cwd_relative_nodeid(self, nodeid: str) -> str: # nodeid's are relative to the rootpath, compute relative to cwd. if self.invocation_params.dir != self.rootpath: fullpath = self.rootpath / nodeid nodeid = bestrelpath(self.invocation_params.dir, fullpath) return nodeid
[docs] @classmethod def fromdictargs(cls, option_dict, args) -> "Config": """Constructor usable for subprocesses.""" config = get_config(args) config.option.__dict__.update(option_dict) config.parse(args, addopts=False) for x in config.option.plugins: config.pluginmanager.consider_pluginarg(x) return config
def _processopt(self, opt: "Argument") -> None: for name in opt._short_opts + opt._long_opts: self._opt2dest[name] = opt.dest if hasattr(opt, "default"): if not hasattr(self.option, opt.dest): setattr(self.option, opt.dest, opt.default) @hookimpl(trylast=True) def pytest_load_initial_conftests(self, early_config: "Config") -> None: # We haven't fully parsed the command line arguments yet, so # early_config.args it not set yet. But we need it for # discovering the initial conftests. So "pre-run" the logic here. # It will be done for real in `parse()`. args, args_source = early_config._decide_args( args=early_config.known_args_namespace.file_or_dir, pyargs=early_config.known_args_namespace.pyargs, testpaths=early_config.getini("testpaths"), invocation_dir=early_config.invocation_params.dir, rootpath=early_config.rootpath, warn=False, ) self.pluginmanager._set_initial_conftests( args=args, pyargs=early_config.known_args_namespace.pyargs, noconftest=early_config.known_args_namespace.noconftest, rootpath=early_config.rootpath, confcutdir=early_config.known_args_namespace.confcutdir, invocation_dir=early_config.invocation_params.dir, importmode=early_config.known_args_namespace.importmode, consider_namespace_packages=early_config.getini( "consider_namespace_packages" ), ) def _initini(self, args: Sequence[str]) -> None: ns, unknown_args = self._parser.parse_known_and_unknown_args( args, namespace=copy.copy(self.option) ) rootpath, inipath, inicfg = determine_setup( inifile=ns.inifilename, args=ns.file_or_dir + unknown_args, rootdir_cmd_arg=ns.rootdir or None, invocation_dir=self.invocation_params.dir, ) self._rootpath = rootpath self._inipath = inipath self.inicfg = inicfg self._parser.extra_info["rootdir"] = str(self.rootpath) self._parser.extra_info["inifile"] = str(self.inipath) self._parser.addini("addopts", "Extra command line options", "args") self._parser.addini("minversion", "Minimally required pytest version") self._parser.addini( "required_plugins", "Plugins that must be present for pytest to run", type="args", default=[], ) self._override_ini = ns.override_ini or () def _consider_importhook(self, args: Sequence[str]) -> None: """Install the PEP 302 import hook if using assertion rewriting. Needs to parse the --assert=<mode> option from the commandline and find all the installed plugins to mark them for rewriting by the importhook. """ ns, unknown_args = self._parser.parse_known_and_unknown_args(args) mode = getattr(ns, "assertmode", "plain") if mode == "rewrite": import _pytest.assertion try: hook = _pytest.assertion.install_importhook(self) except SystemError: mode = "plain" else: self._mark_plugins_for_rewrite(hook) self._warn_about_missing_assertion(mode) def _mark_plugins_for_rewrite(self, hook) -> None: """Given an importhook, mark for rewrite any top-level modules or packages in the distribution package for all pytest plugins.""" self.pluginmanager.rewrite_hook = hook if os.environ.get("PYTEST_DISABLE_PLUGIN_AUTOLOAD"): # We don't autoload from setuptools entry points, no need to continue. return package_files = ( str(file) for dist in importlib.metadata.distributions() if any(ep.group == "pytest11" for ep in dist.entry_points) for file in dist.files or [] ) for name in _iter_rewritable_modules(package_files): hook.mark_rewrite(name) def _validate_args(self, args: List[str], via: str) -> List[str]: """Validate known args.""" self._parser._config_source_hint = via # type: ignore try: self._parser.parse_known_and_unknown_args( args, namespace=copy.copy(self.option) ) finally: del self._parser._config_source_hint # type: ignore return args def _decide_args( self, *, args: List[str], pyargs: bool, testpaths: List[str], invocation_dir: Path, rootpath: Path, warn: bool, ) -> Tuple[List[str], ArgsSource]: """Decide the args (initial paths/nodeids) to use given the relevant inputs. :param warn: Whether can issue warnings. :returns: The args and the args source. Guaranteed to be non-empty. """ if args: source = Config.ArgsSource.ARGS result = args else: if invocation_dir == rootpath: source = Config.ArgsSource.TESTPATHS if pyargs: result = testpaths else: result = [] for path in testpaths: result.extend(sorted(glob.iglob(path, recursive=True))) if testpaths and not result: if warn: warning_text = ( "No files were found in testpaths; " "consider removing or adjusting your testpaths configuration. " "Searching recursively from the current directory instead." ) self.issue_config_time_warning( PytestConfigWarning(warning_text), stacklevel=3 ) else: result = [] if not result: source = Config.ArgsSource.INVOCATION_DIR result = [str(invocation_dir)] return result, source def _preparse(self, args: List[str], addopts: bool = True) -> None: if addopts: env_addopts = os.environ.get("PYTEST_ADDOPTS", "") if len(env_addopts): args[:] = ( self._validate_args(shlex.split(env_addopts), "via PYTEST_ADDOPTS") + args ) self._initini(args) if addopts: args[:] = ( self._validate_args(self.getini("addopts"), "via addopts config") + args ) self.known_args_namespace = self._parser.parse_known_args( args, namespace=copy.copy(self.option) ) self._checkversion() self._consider_importhook(args) self.pluginmanager.consider_preparse(args, exclude_only=False) if not os.environ.get("PYTEST_DISABLE_PLUGIN_AUTOLOAD"): # Don't autoload from setuptools entry point. Only explicitly specified # plugins are going to be loaded. self.pluginmanager.load_setuptools_entrypoints("pytest11") self.pluginmanager.consider_env() self.known_args_namespace = self._parser.parse_known_args( args, namespace=copy.copy(self.known_args_namespace) ) self._validate_plugins() self._warn_about_skipped_plugins() if self.known_args_namespace.confcutdir is None: if self.inipath is not None: confcutdir = str(self.inipath.parent) else: confcutdir = str(self.rootpath) self.known_args_namespace.confcutdir = confcutdir try: self.hook.pytest_load_initial_conftests( early_config=self, args=args, parser=self._parser ) except ConftestImportFailure as e: if self.known_args_namespace.help or self.known_args_namespace.version: # we don't want to prevent --help/--version to work # so just let is pass and print a warning at the end self.issue_config_time_warning( PytestConfigWarning(f"could not load initial conftests: {e.path}"), stacklevel=2, ) else: raise @hookimpl(wrapper=True) def pytest_collection(self) -> Generator[None, object, object]: # Validate invalid ini keys after collection is done so we take in account # options added by late-loading conftest files. try: return (yield) finally: self._validate_config_options() def _checkversion(self) -> None: import pytest minver = self.inicfg.get("minversion", None) if minver: # Imported lazily to improve start-up time. from packaging.version import Version if not isinstance(minver, str): raise pytest.UsageError( "%s: 'minversion' must be a single value" % self.inipath ) if Version(minver) > Version(pytest.__version__): raise pytest.UsageError( f"{self.inipath}: 'minversion' requires pytest-{minver}, actual pytest-{pytest.__version__}'" ) def _validate_config_options(self) -> None: for key in sorted(self._get_unknown_ini_keys()): self._warn_or_fail_if_strict(f"Unknown config option: {key}\n") def _validate_plugins(self) -> None: required_plugins = sorted(self.getini("required_plugins")) if not required_plugins: return # Imported lazily to improve start-up time. from packaging.requirements import InvalidRequirement from packaging.requirements import Requirement from packaging.version import Version plugin_info = self.pluginmanager.list_plugin_distinfo() plugin_dist_info = {dist.project_name: dist.version for _, dist in plugin_info} missing_plugins = [] for required_plugin in required_plugins: try: req = Requirement(required_plugin) except InvalidRequirement: missing_plugins.append(required_plugin) continue if req.name not in plugin_dist_info: missing_plugins.append(required_plugin) elif not req.specifier.contains( Version(plugin_dist_info[req.name]), prereleases=True ): missing_plugins.append(required_plugin) if missing_plugins: raise UsageError( "Missing required plugins: {}".format(", ".join(missing_plugins)), ) def _warn_or_fail_if_strict(self, message: str) -> None: if self.known_args_namespace.strict_config: raise UsageError(message) self.issue_config_time_warning(PytestConfigWarning(message), stacklevel=3) def _get_unknown_ini_keys(self) -> List[str]: parser_inicfg = self._parser._inidict return [name for name in self.inicfg if name not in parser_inicfg] def parse(self, args: List[str], addopts: bool = True) -> None: # Parse given cmdline arguments into this config object. assert ( self.args == [] ), "can only parse cmdline args at most once per Config object" self.hook.pytest_addhooks.call_historic( kwargs=dict(pluginmanager=self.pluginmanager) ) self._preparse(args, addopts=addopts) self._parser.after_preparse = True # type: ignore try: args = self._parser.parse_setoption( args, self.option, namespace=self.option ) self.args, self.args_source = self._decide_args( args=args, pyargs=self.known_args_namespace.pyargs, testpaths=self.getini("testpaths"), invocation_dir=self.invocation_params.dir, rootpath=self.rootpath, warn=True, ) except PrintHelp: pass
[docs] def issue_config_time_warning(self, warning: Warning, stacklevel: int) -> None: """Issue and handle a warning during the "configure" stage. During ``pytest_configure`` we can't capture warnings using the ``catch_warnings_for_item`` function because it is not possible to have hook wrappers around ``pytest_configure``. This function is mainly intended for plugins that need to issue warnings during ``pytest_configure`` (or similar stages). :param warning: The warning instance. :param stacklevel: stacklevel forwarded to warnings.warn. """ if self.pluginmanager.is_blocked("warnings"): return cmdline_filters = self.known_args_namespace.pythonwarnings or [] config_filters = self.getini("filterwarnings") with warnings.catch_warnings(record=True) as records: warnings.simplefilter("always", type(warning)) apply_warning_filters(config_filters, cmdline_filters) warnings.warn(warning, stacklevel=stacklevel) if records: frame = sys._getframe(stacklevel - 1) location = frame.f_code.co_filename, frame.f_lineno, frame.f_code.co_name self.hook.pytest_warning_recorded.call_historic( kwargs=dict( warning_message=records[0], when="config", nodeid="", location=location, ) )
[docs] def addinivalue_line(self, name: str, line: str) -> None: """Add a line to an ini-file option. The option must have been declared but might not yet be set in which case the line becomes the first line in its value.""" x = self.getini(name) assert isinstance(x, list) x.append(line) # modifies the cached list inline
[docs] def getini(self, name: str): """Return configuration value from an :ref:`ini file <configfiles>`. If a configuration value is not defined in an :ref:`ini file <configfiles>`, then the ``default`` value provided while registering the configuration through :func:`parser.addini <pytest.Parser.addini>` will be returned. Please note that you can even provide ``None`` as a valid default value. If ``default`` is not provided while registering using :func:`parser.addini <pytest.Parser.addini>`, then a default value based on the ``type`` parameter passed to :func:`parser.addini <pytest.Parser.addini>` will be returned. The default values based on ``type`` are: ``paths``, ``pathlist``, ``args`` and ``linelist`` : empty list ``[]`` ``bool`` : ``False`` ``string`` : empty string ``""`` If neither the ``default`` nor the ``type`` parameter is passed while registering the configuration through :func:`parser.addini <pytest.Parser.addini>`, then the configuration is treated as a string and a default empty string '' is returned. If the specified name hasn't been registered through a prior :func:`parser.addini <pytest.Parser.addini>` call (usually from a plugin), a ValueError is raised. """ try: return self._inicache[name] except KeyError: self._inicache[name] = val = self._getini(name) return val
# Meant for easy monkeypatching by legacypath plugin. # Can be inlined back (with no cover removed) once legacypath is gone. def _getini_unknown_type(self, name: str, type: str, value: Union[str, List[str]]): msg = f"unknown configuration type: {type}" raise ValueError(msg, value) # pragma: no cover def _getini(self, name: str): try: description, type, default = self._parser._inidict[name] except KeyError as e: raise ValueError(f"unknown configuration value: {name!r}") from e override_value = self._get_override_ini_value(name) if override_value is None: try: value = self.inicfg[name] except KeyError: return default else: value = override_value # Coerce the values based on types. # # Note: some coercions are only required if we are reading from .ini files, because # the file format doesn't contain type information, but when reading from toml we will # get either str or list of str values (see _parse_ini_config_from_pyproject_toml). # For example: # # ini: # a_line_list = "tests acceptance" # in this case, we need to split the string to obtain a list of strings. # # toml: # a_line_list = ["tests", "acceptance"] # in this case, we already have a list ready to use. # if type == "paths": dp = ( self.inipath.parent if self.inipath is not None else self.invocation_params.dir ) input_values = shlex.split(value) if isinstance(value, str) else value return [dp / x for x in input_values] elif type == "args": return shlex.split(value) if isinstance(value, str) else value elif type == "linelist": if isinstance(value, str): return [t for t in map(lambda x: x.strip(), value.split("\n")) if t] else: return value elif type == "bool": return _strtobool(str(value).strip()) elif type == "string": return value elif type is None: return value else: return self._getini_unknown_type(name, type, value) def _getconftest_pathlist(self, name: str, path: Path) -> Optional[List[Path]]: try: mod, relroots = self.pluginmanager._rget_with_confmod(name, path) except KeyError: return None assert mod.__file__ is not None modpath = Path(mod.__file__).parent values: List[Path] = [] for relroot in relroots: if isinstance(relroot, os.PathLike): relroot = Path(relroot) else: relroot = relroot.replace("/", os.sep) relroot = absolutepath(modpath / relroot) values.append(relroot) return values def _get_override_ini_value(self, name: str) -> Optional[str]: value = None # override_ini is a list of "ini=value" options. # Always use the last item if multiple values are set for same ini-name, # e.g. -o foo=bar1 -o foo=bar2 will set foo to bar2. for ini_config in self._override_ini: try: key, user_ini_value = ini_config.split("=", 1) except ValueError as e: raise UsageError( f"-o/--override-ini expects option=value style (got: {ini_config!r})." ) from e else: if key == name: value = user_ini_value return value
[docs] def getoption(self, name: str, default=notset, skip: bool = False): """Return command line option value. :param name: Name of the option. You may also specify the literal ``--OPT`` option instead of the "dest" option name. :param default: Default value if no option of that name exists. :param skip: If True, raise pytest.skip if option does not exists or has a None value. """ name = self._opt2dest.get(name, name) try: val = getattr(self.option, name) if val is None and skip: raise AttributeError(name) return val except AttributeError as e: if default is not notset: return default if skip: import pytest pytest.skip(f"no {name!r} option found") raise ValueError(f"no option named {name!r}") from e
[docs] def getvalue(self, name: str, path=None): """Deprecated, use getoption() instead.""" return self.getoption(name)
[docs] def getvalueorskip(self, name: str, path=None): """Deprecated, use getoption(skip=True) instead.""" return self.getoption(name, skip=True)
#: Verbosity type for failed assertions (see :confval:`verbosity_assertions`). VERBOSITY_ASSERTIONS: Final = "assertions" #: Verbosity type for test case execution (see :confval:`verbosity_test_cases`). VERBOSITY_TEST_CASES: Final = "test_cases" _VERBOSITY_INI_DEFAULT: Final = "auto"
[docs] def get_verbosity(self, verbosity_type: Optional[str] = None) -> int: r"""Retrieve the verbosity level for a fine-grained verbosity type. :param verbosity_type: Verbosity type to get level for. If a level is configured for the given type, that value will be returned. If the given type is not a known verbosity type, the global verbosity level will be returned. If the given type is None (default), the global verbosity level will be returned. To configure a level for a fine-grained verbosity type, the configuration file should have a setting for the configuration name and a numeric value for the verbosity level. A special value of "auto" can be used to explicitly use the global verbosity level. Example: .. code-block:: ini # content of pytest.ini [pytest] verbosity_assertions = 2 .. code-block:: console pytest -v .. code-block:: python print(config.get_verbosity()) # 1 print(config.get_verbosity(Config.VERBOSITY_ASSERTIONS)) # 2 """ global_level = self.option.verbose assert isinstance(global_level, int) if verbosity_type is None: return global_level ini_name = Config._verbosity_ini_name(verbosity_type) if ini_name not in self._parser._inidict: return global_level level = self.getini(ini_name) if level == Config._VERBOSITY_INI_DEFAULT: return global_level return int(level)
@staticmethod def _verbosity_ini_name(verbosity_type: str) -> str: return f"verbosity_{verbosity_type}" @staticmethod def _add_verbosity_ini(parser: "Parser", verbosity_type: str, help: str) -> None: """Add a output verbosity configuration option for the given output type. :param parser: Parser for command line arguments and ini-file values. :param verbosity_type: Fine-grained verbosity category. :param help: Description of the output this type controls. The value should be retrieved via a call to :py:func:`config.get_verbosity(type) <pytest.Config.get_verbosity>`. """ parser.addini( Config._verbosity_ini_name(verbosity_type), help=help, type="string", default=Config._VERBOSITY_INI_DEFAULT, ) def _warn_about_missing_assertion(self, mode: str) -> None: if not _assertion_supported(): if mode == "plain": warning_text = ( "ASSERTIONS ARE NOT EXECUTED" " and FAILING TESTS WILL PASS. Are you" " using python -O?" ) else: warning_text = ( "assertions not in test modules or" " plugins will be ignored" " because assert statements are not executed " "by the underlying Python interpreter " "(are you using python -O?)\n" ) self.issue_config_time_warning( PytestConfigWarning(warning_text), stacklevel=3, ) def _warn_about_skipped_plugins(self) -> None: for module_name, msg in self.pluginmanager.skipped_plugins: self.issue_config_time_warning( PytestConfigWarning(f"skipped plugin {module_name!r}: {msg}"), stacklevel=2, )
def _assertion_supported() -> bool: try: assert False except AssertionError: return True else: return False # type: ignore[unreachable] def create_terminal_writer( config: Config, file: Optional[TextIO] = None ) -> TerminalWriter: """Create a TerminalWriter instance configured according to the options in the config object. Every code which requires a TerminalWriter object and has access to a config object should use this function. """ tw = TerminalWriter(file=file) if config.option.color == "yes": tw.hasmarkup = True elif config.option.color == "no": tw.hasmarkup = False if config.option.code_highlight == "yes": tw.code_highlight = True elif config.option.code_highlight == "no": tw.code_highlight = False return tw def _strtobool(val: str) -> bool: """Convert a string representation of truth to True or False. True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values are 'n', 'no', 'f', 'false', 'off', and '0'. Raises ValueError if 'val' is anything else. .. note:: Copied from distutils.util. """ val = val.lower() if val in ("y", "yes", "t", "true", "on", "1"): return True elif val in ("n", "no", "f", "false", "off", "0"): return False else: raise ValueError(f"invalid truth value {val!r}") @lru_cache(maxsize=50) def parse_warning_filter( arg: str, *, escape: bool ) -> Tuple["warnings._ActionKind", str, Type[Warning], str, int]: """Parse a warnings filter string. This is copied from warnings._setoption with the following changes: * Does not apply the filter. * Escaping is optional. * Raises UsageError so we get nice error messages on failure. """ __tracebackhide__ = True error_template = dedent( f"""\ while parsing the following warning configuration: {arg} This error occurred: {{error}} """ ) parts = arg.split(":") if len(parts) > 5: doc_url = ( "https://docs.python.org/3/library/warnings.html#describing-warning-filters" ) error = dedent( f"""\ Too many fields ({len(parts)}), expected at most 5 separated by colons: action:message:category:module:line For more information please consult: {doc_url} """ ) raise UsageError(error_template.format(error=error)) while len(parts) < 5: parts.append("") action_, message, category_, module, lineno_ = (s.strip() for s in parts) try: action: "warnings._ActionKind" = warnings._getaction(action_) # type: ignore[attr-defined] except warnings._OptionError as e: raise UsageError(error_template.format(error=str(e))) from None try: category: Type[Warning] = _resolve_warning_category(category_) except Exception: exc_info = ExceptionInfo.from_current() exception_text = exc_info.getrepr(style="native") raise UsageError(error_template.format(error=exception_text)) from None if message and escape: message = re.escape(message) if module and escape: module = re.escape(module) + r"\Z" if lineno_: try: lineno = int(lineno_) if lineno < 0: raise ValueError("number is negative") except ValueError as e: raise UsageError( error_template.format(error=f"invalid lineno {lineno_!r}: {e}") ) from None else: lineno = 0 return action, message, category, module, lineno def _resolve_warning_category(category: str) -> Type[Warning]: """ Copied from warnings._getcategory, but changed so it lets exceptions (specially ImportErrors) propagate so we can get access to their tracebacks (#9218). """ __tracebackhide__ = True if not category: return Warning if "." not in category: import builtins as m klass = category else: module, _, klass = category.rpartition(".") m = __import__(module, None, None, [klass]) cat = getattr(m, klass) if not issubclass(cat, Warning): raise UsageError(f"{cat} is not a Warning subclass") return cast(Type[Warning], cat) def apply_warning_filters( config_filters: Iterable[str], cmdline_filters: Iterable[str] ) -> None: """Applies pytest-configured filters to the warnings module""" # Filters should have this precedence: cmdline options, config. # Filters should be applied in the inverse order of precedence. for arg in config_filters: warnings.filterwarnings(*parse_warning_filter(arg, escape=False)) for arg in cmdline_filters: warnings.filterwarnings(*parse_warning_filter(arg, escape=True))