Source code for _pytest.nodes

# mypy: allow-untyped-defs
import abc
from functools import cached_property
from inspect import signature
import os
import pathlib
from pathlib import Path
from typing import Any
from typing import Callable
from typing import cast
from typing import Iterable
from typing import Iterator
from typing import List
from typing import MutableMapping
from typing import NoReturn
from typing import Optional
from typing import overload
from typing import Set
from typing import Tuple
from typing import Type
from typing import TYPE_CHECKING
from typing import TypeVar
from typing import Union
import warnings

import pluggy

import _pytest._code
from _pytest._code import getfslineno
from _pytest._code.code import ExceptionInfo
from _pytest._code.code import TerminalRepr
from _pytest._code.code import Traceback
from _pytest._code.code import TracebackStyle
from _pytest.compat import LEGACY_PATH
from _pytest.config import Config
from _pytest.config import ConftestImportFailure
from _pytest.config.compat import _check_path
from _pytest.deprecated import NODE_CTOR_FSPATH_ARG
from _pytest.mark.structures import Mark
from _pytest.mark.structures import MarkDecorator
from _pytest.mark.structures import NodeKeywords
from _pytest.outcomes import fail
from _pytest.pathlib import absolutepath
from _pytest.pathlib import commonpath
from _pytest.stash import Stash
from _pytest.warning_types import PytestWarning


if TYPE_CHECKING:
    from typing import Self

    # Imported here due to circular import.
    from _pytest.main import Session


SEP = "/"

tracebackcutdir = Path(_pytest.__file__).parent


_T = TypeVar("_T")


def _imply_path(
    node_type: Type["Node"],
    path: Optional[Path],
    fspath: Optional[LEGACY_PATH],
) -> Path:
    if fspath is not None:
        warnings.warn(
            NODE_CTOR_FSPATH_ARG.format(
                node_type_name=node_type.__name__,
            ),
            stacklevel=6,
        )
    if path is not None:
        if fspath is not None:
            _check_path(path, fspath)
        return path
    else:
        assert fspath is not None
        return Path(fspath)


_NodeType = TypeVar("_NodeType", bound="Node")


class NodeMeta(abc.ABCMeta):
    """Metaclass used by :class:`Node` to enforce that direct construction raises
    :class:`Failed`.

    This behaviour supports the indirection introduced with :meth:`Node.from_parent`,
    the named constructor to be used instead of direct construction. The design
    decision to enforce indirection with :class:`NodeMeta` was made as a
    temporary aid for refactoring the collection tree, which was diagnosed to
    have :class:`Node` objects whose creational patterns were overly entangled.
    Once the refactoring is complete, this metaclass can be removed.

    See https://github.com/pytest-dev/pytest/projects/3 for an overview of the
    progress on detangling the :class:`Node` classes.
    """

    def __call__(cls, *k, **kw) -> NoReturn:
        msg = (
            "Direct construction of {name} has been deprecated, please use {name}.from_parent.\n"
            "See "
            "https://docs.pytest.org/en/stable/deprecations.html#node-construction-changed-to-node-from-parent"
            " for more details."
        ).format(name=f"{cls.__module__}.{cls.__name__}")
        fail(msg, pytrace=False)

    def _create(cls: Type[_T], *k, **kw) -> _T:
        try:
            return super().__call__(*k, **kw)  # type: ignore[no-any-return,misc]
        except TypeError:
            sig = signature(getattr(cls, "__init__"))
            known_kw = {k: v for k, v in kw.items() if k in sig.parameters}
            from .warning_types import PytestDeprecationWarning

            warnings.warn(
                PytestDeprecationWarning(
                    f"{cls} is not using a cooperative constructor and only takes {set(known_kw)}.\n"
                    "See https://docs.pytest.org/en/stable/deprecations.html"
                    "#constructors-of-custom-pytest-node-subclasses-should-take-kwargs "
                    "for more details."
                )
            )

            return super().__call__(*k, **known_kw)  # type: ignore[no-any-return,misc]


[docs] class Node(abc.ABC, metaclass=NodeMeta): r"""Base class of :class:`Collector` and :class:`Item`, the components of the test collection tree. ``Collector``\'s are the internal nodes of the tree, and ``Item``\'s are the leaf nodes. """ # Implemented in the legacypath plugin. #: A ``LEGACY_PATH`` copy of the :attr:`path` attribute. Intended for usage #: for methods not migrated to ``pathlib.Path`` yet, such as #: :meth:`Item.reportinfo <pytest.Item.reportinfo>`. Will be deprecated in #: a future release, prefer using :attr:`path` instead. fspath: LEGACY_PATH # Use __slots__ to make attribute access faster. # Note that __dict__ is still available. __slots__ = ( "name", "parent", "config", "session", "path", "_nodeid", "_store", "__dict__", ) def __init__( self, name: str, parent: "Optional[Node]" = None, config: Optional[Config] = None, session: "Optional[Session]" = None, fspath: Optional[LEGACY_PATH] = None, path: Optional[Path] = None, nodeid: Optional[str] = None, ) -> None: #: A unique name within the scope of the parent node. self.name: str = name #: The parent collector node. self.parent = parent if config: #: The pytest config object. self.config: Config = config else: if not parent: raise TypeError("config or parent must be provided") self.config = parent.config if session: #: The pytest session this node is part of. self.session: Session = session else: if not parent: raise TypeError("session or parent must be provided") self.session = parent.session if path is None and fspath is None: path = getattr(parent, "path", None) #: Filesystem path where this node was collected from (can be None). self.path: pathlib.Path = _imply_path(type(self), path, fspath=fspath) # The explicit annotation is to avoid publicly exposing NodeKeywords. #: Keywords/markers collected from all scopes. self.keywords: MutableMapping[str, Any] = NodeKeywords(self) #: The marker objects belonging to this node. self.own_markers: List[Mark] = [] #: Allow adding of extra keywords to use for matching. self.extra_keyword_matches: Set[str] = set() if nodeid is not None: assert "::()" not in nodeid self._nodeid = nodeid else: if not self.parent: raise TypeError("nodeid or parent must be provided") self._nodeid = self.parent.nodeid + "::" + self.name #: A place where plugins can store information on the node for their #: own use. self.stash: Stash = Stash() # Deprecated alias. Was never public. Can be removed in a few releases. self._store = self.stash
[docs] @classmethod def from_parent(cls, parent: "Node", **kw) -> "Self": """Public constructor for Nodes. This indirection got introduced in order to enable removing the fragile logic from the node constructors. Subclasses can use ``super().from_parent(...)`` when overriding the construction. :param parent: The parent node of this Node. """ if "config" in kw: raise TypeError("config is not a valid argument for from_parent") if "session" in kw: raise TypeError("session is not a valid argument for from_parent") return cls._create(parent=parent, **kw)
@property def ihook(self) -> pluggy.HookRelay: """fspath-sensitive hook proxy used to call pytest hooks.""" return self.session.gethookproxy(self.path) def __repr__(self) -> str: return "<{} {}>".format(self.__class__.__name__, getattr(self, "name", None))
[docs] def warn(self, warning: Warning) -> None: """Issue a warning for this Node. Warnings will be displayed after the test session, unless explicitly suppressed. :param Warning warning: The warning instance to issue. :raises ValueError: If ``warning`` instance is not a subclass of Warning. Example usage: .. code-block:: python node.warn(PytestWarning("some message")) node.warn(UserWarning("some message")) .. versionchanged:: 6.2 Any subclass of :class:`Warning` is now accepted, rather than only :class:`PytestWarning <pytest.PytestWarning>` subclasses. """ # enforce type checks here to avoid getting a generic type error later otherwise. if not isinstance(warning, Warning): raise ValueError( f"warning must be an instance of Warning or subclass, got {warning!r}" ) path, lineno = get_fslocation_from_item(self) assert lineno is not None warnings.warn_explicit( warning, category=None, filename=str(path), lineno=lineno + 1, )
# Methods for ordering nodes. @property def nodeid(self) -> str: """A ::-separated string denoting its collection tree address.""" return self._nodeid def __hash__(self) -> int: return hash(self._nodeid) def setup(self) -> None: pass def teardown(self) -> None: pass
[docs] def iter_parents(self) -> Iterator["Node"]: """Iterate over all parent collectors starting from and including self up to the root of the collection tree. .. versionadded:: 8.1 """ parent: Optional[Node] = self while parent is not None: yield parent parent = parent.parent
[docs] def listchain(self) -> List["Node"]: """Return a list of all parent collectors starting from the root of the collection tree down to and including self.""" chain = [] item: Optional[Node] = self while item is not None: chain.append(item) item = item.parent chain.reverse() return chain
[docs] def add_marker( self, marker: Union[str, MarkDecorator], append: bool = True ) -> None: """Dynamically add a marker object to the node. :param marker: The marker. :param append: Whether to append the marker, or prepend it. """ from _pytest.mark import MARK_GEN if isinstance(marker, MarkDecorator): marker_ = marker elif isinstance(marker, str): marker_ = getattr(MARK_GEN, marker) else: raise ValueError("is not a string or pytest.mark.* Marker") self.keywords[marker_.name] = marker_ if append: self.own_markers.append(marker_.mark) else: self.own_markers.insert(0, marker_.mark)
[docs] def iter_markers(self, name: Optional[str] = None) -> Iterator[Mark]: """Iterate over all markers of the node. :param name: If given, filter the results by the name attribute. :returns: An iterator of the markers of the node. """ return (x[1] for x in self.iter_markers_with_node(name=name))
[docs] def iter_markers_with_node( self, name: Optional[str] = None ) -> Iterator[Tuple["Node", Mark]]: """Iterate over all markers of the node. :param name: If given, filter the results by the name attribute. :returns: An iterator of (node, mark) tuples. """ for node in self.iter_parents(): for mark in node.own_markers: if name is None or getattr(mark, "name", None) == name: yield node, mark
@overload def get_closest_marker(self, name: str) -> Optional[Mark]: ... @overload def get_closest_marker(self, name: str, default: Mark) -> Mark: ...
[docs] def get_closest_marker( self, name: str, default: Optional[Mark] = None ) -> Optional[Mark]: """Return the first marker matching the name, from closest (for example function) to farther level (for example module level). :param default: Fallback return value if no marker was found. :param name: Name to filter by. """ return next(self.iter_markers(name=name), default)
[docs] def listextrakeywords(self) -> Set[str]: """Return a set of all extra keywords in self and any parents.""" extra_keywords: Set[str] = set() for item in self.listchain(): extra_keywords.update(item.extra_keyword_matches) return extra_keywords
def listnames(self) -> List[str]: return [x.name for x in self.listchain()]
[docs] def addfinalizer(self, fin: Callable[[], object]) -> None: """Register a function to be called without arguments when this node is finalized. This method can only be called when this node is active in a setup chain, for example during self.setup(). """ self.session._setupstate.addfinalizer(fin, self)
[docs] def getparent(self, cls: Type[_NodeType]) -> Optional[_NodeType]: """Get the closest parent node (including self) which is an instance of the given class. :param cls: The node class to search for. :returns: The node, if found. """ for node in self.iter_parents(): if isinstance(node, cls): return node return None
def _traceback_filter(self, excinfo: ExceptionInfo[BaseException]) -> Traceback: return excinfo.traceback def _repr_failure_py( self, excinfo: ExceptionInfo[BaseException], style: "Optional[TracebackStyle]" = None, ) -> TerminalRepr: from _pytest.fixtures import FixtureLookupError if isinstance(excinfo.value, ConftestImportFailure): excinfo = ExceptionInfo.from_exception(excinfo.value.cause) if isinstance(excinfo.value, fail.Exception): if not excinfo.value.pytrace: style = "value" if isinstance(excinfo.value, FixtureLookupError): return excinfo.value.formatrepr() tbfilter: Union[bool, Callable[[ExceptionInfo[BaseException]], Traceback]] if self.config.getoption("fulltrace", False): style = "long" tbfilter = False else: tbfilter = self._traceback_filter if style == "auto": style = "long" # XXX should excinfo.getrepr record all data and toterminal() process it? if style is None: if self.config.getoption("tbstyle", "auto") == "short": style = "short" else: style = "long" if self.config.getoption("verbose", 0) > 1: truncate_locals = False else: truncate_locals = True truncate_args = False if self.config.getoption("verbose", 0) > 2 else True # excinfo.getrepr() formats paths relative to the CWD if `abspath` is False. # It is possible for a fixture/test to change the CWD while this code runs, which # would then result in the user seeing confusing paths in the failure message. # To fix this, if the CWD changed, always display the full absolute path. # It will be better to just always display paths relative to invocation_dir, but # this requires a lot of plumbing (#6428). try: abspath = Path(os.getcwd()) != self.config.invocation_params.dir except OSError: abspath = True return excinfo.getrepr( funcargs=True, abspath=abspath, showlocals=self.config.getoption("showlocals", False), style=style, tbfilter=tbfilter, truncate_locals=truncate_locals, truncate_args=truncate_args, )
[docs] def repr_failure( self, excinfo: ExceptionInfo[BaseException], style: "Optional[TracebackStyle]" = None, ) -> Union[str, TerminalRepr]: """Return a representation of a collection or test failure. .. seealso:: :ref:`non-python tests` :param excinfo: Exception information for the failure. """ return self._repr_failure_py(excinfo, style)
def get_fslocation_from_item(node: "Node") -> Tuple[Union[str, Path], Optional[int]]: """Try to extract the actual location from a node, depending on available attributes: * "location": a pair (path, lineno) * "obj": a Python object that the node wraps. * "path": just a path :rtype: A tuple of (str|Path, int) with filename and 0-based line number. """ # See Item.location. location: Optional[Tuple[str, Optional[int], str]] = getattr(node, "location", None) if location is not None: return location[:2] obj = getattr(node, "obj", None) if obj is not None: return getfslineno(obj) return getattr(node, "path", "unknown location"), -1
[docs] class Collector(Node, abc.ABC): """Base class of all collectors. Collector create children through `collect()` and thus iteratively build the collection tree. """
[docs] class CollectError(Exception): """An error during collection, contains a custom message."""
[docs] @abc.abstractmethod def collect(self) -> Iterable[Union["Item", "Collector"]]: """Collect children (items and collectors) for this collector.""" raise NotImplementedError("abstract")
# TODO: This omits the style= parameter which breaks Liskov Substitution.
[docs] def repr_failure( # type: ignore[override] self, excinfo: ExceptionInfo[BaseException] ) -> Union[str, TerminalRepr]: """Return a representation of a collection failure. :param excinfo: Exception information for the failure. """ if isinstance(excinfo.value, self.CollectError) and not self.config.getoption( "fulltrace", False ): exc = excinfo.value return str(exc.args[0]) # Respect explicit tbstyle option, but default to "short" # (_repr_failure_py uses "long" with "fulltrace" option always). tbstyle = self.config.getoption("tbstyle", "auto") if tbstyle == "auto": tbstyle = "short" return self._repr_failure_py(excinfo, style=tbstyle)
def _traceback_filter(self, excinfo: ExceptionInfo[BaseException]) -> Traceback: if hasattr(self, "path"): traceback = excinfo.traceback ntraceback = traceback.cut(path=self.path) if ntraceback == traceback: ntraceback = ntraceback.cut(excludepath=tracebackcutdir) return ntraceback.filter(excinfo) return excinfo.traceback
def _check_initialpaths_for_relpath(session: "Session", path: Path) -> Optional[str]: for initial_path in session._initialpaths: if commonpath(path, initial_path) == initial_path: rel = str(path.relative_to(initial_path)) return "" if rel == "." else rel return None
[docs] class FSCollector(Collector, abc.ABC): """Base class for filesystem collectors.""" def __init__( self, fspath: Optional[LEGACY_PATH] = None, path_or_parent: Optional[Union[Path, Node]] = None, path: Optional[Path] = None, name: Optional[str] = None, parent: Optional[Node] = None, config: Optional[Config] = None, session: Optional["Session"] = None, nodeid: Optional[str] = None, ) -> None: if path_or_parent: if isinstance(path_or_parent, Node): assert parent is None parent = cast(FSCollector, path_or_parent) elif isinstance(path_or_parent, Path): assert path is None path = path_or_parent path = _imply_path(type(self), path, fspath=fspath) if name is None: name = path.name if parent is not None and parent.path != path: try: rel = path.relative_to(parent.path) except ValueError: pass else: name = str(rel) name = name.replace(os.sep, SEP) self.path = path if session is None: assert parent is not None session = parent.session if nodeid is None: try: nodeid = str(self.path.relative_to(session.config.rootpath)) except ValueError: nodeid = _check_initialpaths_for_relpath(session, path) if nodeid and os.sep != SEP: nodeid = nodeid.replace(os.sep, SEP) super().__init__( name=name, parent=parent, config=config, session=session, nodeid=nodeid, path=path, )
[docs] @classmethod def from_parent( cls, parent, *, fspath: Optional[LEGACY_PATH] = None, path: Optional[Path] = None, **kw, ) -> "Self": """The public constructor.""" return super().from_parent(parent=parent, fspath=fspath, path=path, **kw)
[docs] class File(FSCollector, abc.ABC): """Base class for collecting tests from a file. :ref:`non-python tests`. """
[docs] class Directory(FSCollector, abc.ABC): """Base class for collecting files from a directory. A basic directory collector does the following: goes over the files and sub-directories in the directory and creates collectors for them by calling the hooks :hook:`pytest_collect_directory` and :hook:`pytest_collect_file`, after checking that they are not ignored using :hook:`pytest_ignore_collect`. The default directory collectors are :class:`~pytest.Dir` and :class:`~pytest.Package`. .. versionadded:: 8.0 :ref:`custom directory collectors`. """
[docs] class Item(Node, abc.ABC): """Base class of all test invocation items. Note that for a single function there might be multiple test invocation items. """ nextitem = None def __init__( self, name, parent=None, config: Optional[Config] = None, session: Optional["Session"] = None, nodeid: Optional[str] = None, **kw, ) -> None: # The first two arguments are intentionally passed positionally, # to keep plugins who define a node type which inherits from # (pytest.Item, pytest.File) working (see issue #8435). # They can be made kwargs when the deprecation above is done. super().__init__( name, parent, config=config, session=session, nodeid=nodeid, **kw, ) self._report_sections: List[Tuple[str, str, str]] = [] #: A list of tuples (name, value) that holds user defined properties #: for this test. self.user_properties: List[Tuple[str, object]] = [] self._check_item_and_collector_diamond_inheritance() def _check_item_and_collector_diamond_inheritance(self) -> None: """ Check if the current type inherits from both File and Collector at the same time, emitting a warning accordingly (#8447). """ cls = type(self) # We inject an attribute in the type to avoid issuing this warning # for the same class more than once, which is not helpful. # It is a hack, but was deemed acceptable in order to avoid # flooding the user in the common case. attr_name = "_pytest_diamond_inheritance_warning_shown" if getattr(cls, attr_name, False): return setattr(cls, attr_name, True) problems = ", ".join( base.__name__ for base in cls.__bases__ if issubclass(base, Collector) ) if problems: warnings.warn( f"{cls.__name__} is an Item subclass and should not be a collector, " f"however its bases {problems} are collectors.\n" "Please split the Collectors and the Item into separate node types.\n" "Pytest Doc example: https://docs.pytest.org/en/latest/example/nonpython.html\n" "example pull request on a plugin: https://github.com/asmeurer/pytest-flakes/pull/40/", PytestWarning, )
[docs] @abc.abstractmethod def runtest(self) -> None: """Run the test case for this item. Must be implemented by subclasses. .. seealso:: :ref:`non-python tests` """ raise NotImplementedError("runtest must be implemented by Item subclass")
[docs] def add_report_section(self, when: str, key: str, content: str) -> None: """Add a new report section, similar to what's done internally to add stdout and stderr captured output:: item.add_report_section("call", "stdout", "report section contents") :param str when: One of the possible capture states, ``"setup"``, ``"call"``, ``"teardown"``. :param str key: Name of the section, can be customized at will. Pytest uses ``"stdout"`` and ``"stderr"`` internally. :param str content: The full contents as a string. """ if content: self._report_sections.append((when, key, content))
[docs] def reportinfo(self) -> Tuple[Union["os.PathLike[str]", str], Optional[int], str]: """Get location information for this item for test reports. Returns a tuple with three elements: - The path of the test (default ``self.path``) - The 0-based line number of the test (default ``None``) - A name of the test to be shown (default ``""``) .. seealso:: :ref:`non-python tests` """ return self.path, None, ""
@cached_property def location(self) -> Tuple[str, Optional[int], str]: """ Returns a tuple of ``(relfspath, lineno, testname)`` for this item where ``relfspath`` is file path relative to ``config.rootpath`` and lineno is a 0-based line number. """ location = self.reportinfo() path = absolutepath(location[0]) relfspath = self.session._node_location_to_relpath(path) assert type(location[2]) is str return (relfspath, location[1], location[2])