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pytester.py
"""(Disabled by default) support for testing pytest and pytest plugins. PYTEST_DONT_REWRITE """ import collections.abc import contextlib import gc import importlib import locale import os import platform import re import shutil import subprocess import sys import traceback from fnmatch import fnmatch from io import StringIO from pathlib import Path from typing import Any from typing import Callable from typing import Dict from typing import Generator from typing import IO from typing import Iterable from typing import List from typing import Optional from typing import overload from typing import Sequence from typing import TextIO from typing import Tuple from typing import Type from typing import TYPE_CHECKING from typing import Union from weakref import WeakKeyDictionary from iniconfig import IniConfig from iniconfig import SectionWrapper from _pytest import timing from _pytest._code import Source from _pytest.capture import _get_multicapture from _pytest.compat import final from _pytest.compat import NOTSET from _pytest.compat import NotSetType from _pytest.config import _PluggyPlugin from _pytest.config import Config from _pytest.config import ExitCode from _pytest.config import hookimpl from _pytest.config import main from _pytest.config import PytestPluginManager from _pytest.config.argparsing import Parser from _pytest.deprecated import check_ispytest from _pytest.fixtures import fixture from _pytest.fixtures import FixtureRequest from _pytest.main import Session from _pytest.monkeypatch import MonkeyPatch from _pytest.nodes import Collector from _pytest.nodes import Item from _pytest.outcomes import fail from _pytest.outcomes import importorskip from _pytest.outcomes import skip from _pytest.pathlib import bestrelpath from _pytest.pathlib import copytree from _pytest.pathlib import make_numbered_dir from _pytest.reports import CollectReport from _pytest.reports import TestReport from _pytest.tmpdir import TempPathFactory from _pytest.warning_types import PytestWarning if TYPE_CHECKING: from typing_extensions import Final from typing_extensions import Literal import pexpect pytest_plugins = ["pytester_assertions"] IGNORE_PAM = [ # filenames added when obtaining details about the current user "/var/lib/sss/mc/passwd" ] def pytest_addoption(parser: Parser) -> None: parser.addoption( "--lsof", action="store_true", dest="lsof", default=False, help="Run FD checks if lsof is available", ) parser.addoption( "--runpytest", default="inprocess", dest="runpytest", choices=("inprocess", "subprocess"), help=( "Run pytest sub runs in tests using an 'inprocess' " "or 'subprocess' (python -m main) method" ), ) parser.addini( "pytester_example_dir", help="Directory to take the pytester example files from" ) def pytest_configure(config: Config) -> None: if config.getvalue("lsof"): checker = LsofFdLeakChecker() if checker.matching_platform(): config.pluginmanager.register(checker) config.addinivalue_line( "markers", "pytester_example_path(*path_segments): join the given path " "segments to `pytester_example_dir` for this test.", ) class LsofFdLeakChecker: def get_open_files(self) -> List[Tuple[str, str]]: out = subprocess.run( ("lsof", "-Ffn0", "-p", str(os.getpid())), stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, check=True, text=True, encoding=locale.getpreferredencoding(False), ).stdout def isopen(line: str) -> bool: return line.startswith("f") and ( "deleted" not in line and "mem" not in line and "txt" not in line and "cwd" not in line ) open_files = [] for line in out.split("\n"): if isopen(line): fields = line.split("\0") fd = fields[0][1:] filename = fields[1][1:] if filename in IGNORE_PAM: continue if filename.startswith("/"): open_files.append((fd, filename)) return open_files def matching_platform(self) -> bool: try: subprocess.run(("lsof", "-v"), check=True) except (OSError, subprocess.CalledProcessError): return False else: return True @hookimpl(hookwrapper=True, tryfirst=True) def pytest_runtest_protocol(self, item: Item) -> Generator[None, None, None]: lines1 = self.get_open_files() yield if hasattr(sys, "pypy_version_info"): gc.collect() lines2 = self.get_open_files() new_fds = {t[0] for t in lines2} - {t[0] for t in lines1} leaked_files = [t for t in lines2 if t[0] in new_fds] if leaked_files: error = [ "***** %s FD leakage detected" % len(leaked_files), *(str(f) for f in leaked_files), "*** Before:", *(str(f) for f in lines1), "*** After:", *(str(f) for f in lines2), "***** %s FD leakage detected" % len(leaked_files), "*** function %s:%s: %s " % item.location, "See issue #2366", ] item.warn(PytestWarning("\n".join(error))) # used at least by pytest-xdist plugin @fixture def _pytest(request: FixtureRequest) -> "PytestArg": """Return a helper which offers a gethookrecorder(hook) method which returns a HookRecorder instance which helps to make assertions about called hooks.""" return PytestArg(request) class PytestArg: def __init__(self, request: FixtureRequest) -> None: self._request = request def gethookrecorder(self, hook) -> "HookRecorder": hookrecorder = HookRecorder(hook._pm) self._request.addfinalizer(hookrecorder.finish_recording) return hookrecorder def get_public_names(values: Iterable[str]) -> List[str]: """Only return names from iterator values without a leading underscore.""" return [x for x in values if x[0] != "_"] @final class RecordedHookCall: """A recorded call to a hook. The arguments to the hook call are set as attributes. For example: .. code-block:: python calls = hook_recorder.getcalls("pytest_runtest_setup") # Suppose pytest_runtest_setup was called once with `item=an_item`. assert calls[0].item is an_item """ def __init__(self, name: str, kwargs) -> None: self.__dict__.update(kwargs) self._name = name def __repr__(self) -> str: d = self.__dict__.copy() del d["_name"] return f"<RecordedHookCall {self._name!r}(**{d!r})>" if TYPE_CHECKING: # The class has undetermined attributes, this tells mypy about it. def __getattr__(self, key: str): ... @final class HookRecorder: """Record all hooks called in a plugin manager. Hook recorders are created by :class:`Pytester`. This wraps all the hook calls in the plugin manager, recording each call before propagating the normal calls. """ def __init__( self, pluginmanager: PytestPluginManager, *, _ispytest: bool = False ) -> None: check_ispytest(_ispytest) self._pluginmanager = pluginmanager self.calls: List[RecordedHookCall] = [] self.ret: Optional[Union[int, ExitCode]] = None def before(hook_name: str, hook_impls, kwargs) -> None: self.calls.append(RecordedHookCall(hook_name, kwargs)) def after(outcome, hook_name: str, hook_impls, kwargs) -> None: pass self._undo_wrapping = pluginmanager.add_hookcall_monitoring(before, after) def finish_recording(self) -> None: self._undo_wrapping() def getcalls(self, names: Union[str, Iterable[str]]) -> List[RecordedHookCall]: """Get all recorded calls to hooks with the given names (or name).""" if isinstance(names, str): names = names.split() return [call for call in self.calls if call._name in names] def assert_contains(self, entries: Sequence[Tuple[str, str]]) -> None: __tracebackhide__ = True i = 0 entries = list(entries) backlocals = sys._getframe(1).f_locals while entries: name, check = entries.pop(0) for ind, call in enumerate(self.calls[i:]): if call._name == name: print("NAMEMATCH", name, call) if eval(check, backlocals, call.__dict__): print("CHECKERMATCH", repr(check), "->", call) else: print("NOCHECKERMATCH", repr(check), "-", call) continue i += ind + 1 break print("NONAMEMATCH", name, "with", call) else: fail(f"could not find {name!r} check {check!r}") def popcall(self, name: str) -> RecordedHookCall: __tracebackhide__ = True for i, call in enumerate(self.calls): if call._name == name: del self.calls[i] return call lines = [f"could not find call {name!r}, in:"] lines.extend([" %s" % x for x in self.calls]) fail("\n".join(lines)) def getcall(self, name: str) -> RecordedHookCall: values = self.getcalls(name) assert len(values) == 1, (name, values) return values[0] # functionality for test reports @overload def getreports( self, names: "Literal['pytest_collectreport']", ) -> Sequence[CollectReport]: ... @overload def getreports( self, names: "Literal['pytest_runtest_logreport']", ) -> Sequence[TestReport]: ... @overload def getreports( self, names: Union[str, Iterable[str]] = ( "pytest_collectreport", "pytest_runtest_logreport", ), ) -> Sequence[Union[CollectReport, TestReport]]: ... def getreports( self, names: Union[str, Iterable[str]] = ( "pytest_collectreport", "pytest_runtest_logreport", ), ) -> Sequence[Union[CollectReport, TestReport]]: return [x.report for x in self.getcalls(names)] def matchreport( self, inamepart: str = "", names: Union[str, Iterable[str]] = ( "pytest_runtest_logreport", "pytest_collectreport", ), when: Optional[str] = None, ) -> Union[CollectReport, TestReport]: """Return a testreport whose dotted import path matches.""" values = [] for rep in self.getreports(names=names): if not when and rep.when != "call" and rep.passed: # setup/teardown passing reports - let's ignore those continue if when and rep.when != when: continue if not inamepart or inamepart in rep.nodeid.split("::"): values.append(rep) if not values: raise ValueError( "could not find test report matching %r: " "no test reports at all!" % (inamepart,) ) if len(values) > 1: raise ValueError( "found 2 or more testreports matching {!r}: {}".format( inamepart, values ) ) return values[0] @overload def getfailures( self, names: "Literal['pytest_collectreport']", ) -> Sequence[CollectReport]: ... @overload def getfailures( self, names: "Literal['pytest_runtest_logreport']", ) -> Sequence[TestReport]: ... @overload def getfailures( self, names: Union[str, Iterable[str]] = ( "pytest_collectreport", "pytest_runtest_logreport", ), ) -> Sequence[Union[CollectReport, TestReport]]: ... def getfailures( self, names: Union[str, Iterable[str]] = ( "pytest_collectreport", "pytest_runtest_logreport", ), ) -> Sequence[Union[CollectReport, TestReport]]: return [rep for rep in self.getreports(names) if rep.failed] def getfailedcollections(self) -> Sequence[CollectReport]: return self.getfailures("pytest_collectreport") def listoutcomes( self, ) -> Tuple[ Sequence[TestReport], Sequence[Union[CollectReport, TestReport]], Sequence[Union[CollectReport, TestReport]], ]: passed = [] skipped = [] failed = [] for rep in self.getreports( ("pytest_collectreport", "pytest_runtest_logreport") ): if rep.passed: if rep.when == "call": assert isinstance(rep, TestReport) passed.append(rep) elif rep.skipped: skipped.append(rep) else: assert rep.failed, f"Unexpected outcome: {rep!r}" failed.append(rep) return passed, skipped, failed def countoutcomes(self) -> List[int]: return [len(x) for x in self.listoutcomes()] def assertoutcome(self, passed: int = 0, skipped: int = 0, failed: int = 0) -> None: __tracebackhide__ = True from _pytest.pytester_assertions import assertoutcome outcomes = self.listoutcomes() assertoutcome( outcomes, passed=passed, skipped=skipped, failed=failed, ) def clear(self) -> None: self.calls[:] = [] @fixture def linecomp() -> "LineComp": """A :class: `LineComp` instance for checking that an input linearly contains a sequence of strings.""" return LineComp() @fixture(name="LineMatcher") def LineMatcher_fixture(request: FixtureRequest) -> Type["LineMatcher"]: """A reference to the :class: `LineMatcher`. This is instantiable with a list of lines (without their trailing newlines). This is useful for testing large texts, such as the output of commands. """ return LineMatcher @fixture def pytester( request: FixtureRequest, tmp_path_factory: TempPathFactory, monkeypatch: MonkeyPatch ) -> "Pytester": """ Facilities to write tests/configuration files, execute pytest in isolation, and match against expected output, perfect for black-box testing of pytest plugins. It attempts to isolate the test run from external factors as much as possible, modifying the current working directory to ``path`` and environment variables during initialization. It is particularly useful for testing plugins. It is similar to the :fixture:`tmp_path` fixture but provides methods which aid in testing pytest itself. """ return Pytester(request, tmp_path_factory, monkeypatch, _ispytest=True) @fixture def _sys_snapshot() -> Generator[None, None, None]: snappaths = SysPathsSnapshot() snapmods = SysModulesSnapshot() yield snapmods.restore() snappaths.restore() @fixture def _config_for_test() -> Generator[Config, None, None]: from _pytest.config import get_config config = get_config() yield config config._ensure_unconfigure() # cleanup, e.g. capman closing tmpfiles. # Regex to match the session duration string in the summary: "74.34s". rex_session_duration = re.compile(r"\d+\.\d\ds") # Regex to match all the counts and phrases in the summary line: "34 passed, 111 skipped". rex_outcome = re.compile(r"(\d+) (\w+)") @final class RunResult: """The result of running a command from :class:`~pytest.Pytester`.""" def __init__( self, ret: Union[int, ExitCode], outlines: List[str], errlines: List[str], duration: float, ) -> None: try: self.ret: Union[int, ExitCode] = ExitCode(ret) """The return value.""" except ValueError: self.ret = ret self.outlines = outlines """List of lines captured from stdout.""" self.errlines = errlines """List of lines captured from stderr.""" self.stdout = LineMatcher(outlines) """:class:`~pytest.LineMatcher` of stdout. Use e.g. :func:`str(stdout) <pytest.LineMatcher.__str__()>` to reconstruct stdout, or the commonly used :func:`stdout.fnmatch_lines() <pytest.LineMatcher.fnmatch_lines()>` method. """ self.stderr = LineMatcher(errlines) """:class:`~pytest.LineMatcher` of stderr.""" self.duration = duration """Duration in seconds.""" def __repr__(self) -> str: return ( "<RunResult ret=%s len(stdout.lines)=%d len(stderr.lines)=%d duration=%.2fs>" % (self.ret, len(self.stdout.lines), len(self.stderr.lines), self.duration) ) def parseoutcomes(self) -> Dict[str, int]: """Return a dictionary of outcome noun -> count from parsing the terminal output that the test process produced. The returned nouns will always be in plural form:: ======= 1 failed, 1 passed, 1 warning, 1 error in 0.13s ==== Will return ``{"failed": 1, "passed": 1, "warnings": 1, "errors": 1}``. """ return self.parse_summary_nouns(self.outlines) @classmethod def parse_summary_nouns(cls, lines) -> Dict[str, int]: """Extract the nouns from a pytest terminal summary line. It always returns the plural noun for consistency:: ======= 1 failed, 1 passed, 1 warning, 1 error in 0.13s ==== Will return ``{"failed": 1, "passed": 1, "warnings": 1, "errors": 1}``. """ for line in reversed(lines): if rex_session_duration.search(line): outcomes = rex_outcome.findall(line) ret = {noun: int(count) for (count, noun) in outcomes} break else: raise ValueError("Pytest terminal summary report not found") to_plural = { "warning": "warnings", "error": "errors", } return {to_plural.get(k, k): v for k, v in ret.items()} def assert_outcomes( self, passed: int = 0, skipped: int = 0, failed: int = 0, errors: int = 0, xpassed: int = 0, xfailed: int = 0, warnings: Optional[int] = None, deselected: Optional[int] = None, ) -> None: """ Assert that the specified outcomes appear with the respective numbers (0 means it didn't occur) in the text output from a test run. ``warnings`` and ``deselected`` are only checked if not None. """ __tracebackhide__ = True from _pytest.pytester_assertions import assert_outcomes outcomes = self.parseoutcomes() assert_outcomes( outcomes, passed=passed, skipped=skipped, failed=failed, errors=errors, xpassed=xpassed, xfailed=xfailed, warnings=warnings, deselected=deselected, ) class CwdSnapshot: def __init__(self) -> None: self.__saved = os.getcwd() def restore(self) -> None: os.chdir(self.__saved) class SysModulesSnapshot: def __init__(self, preserve: Optional[Callable[[str], bool]] = None) -> None: self.__preserve = preserve self.__saved = dict(sys.modules) def restore(self) -> None: if self.__preserve: self.__saved.update( (k, m) for k, m in sys.modules.items() if self.__preserve(k) ) sys.modules.clear() sys.modules.update(self.__saved) class SysPathsSnapshot: def __init__(self) -> None: self.__saved = list(sys.path), list(sys.meta_path) def restore(self) -> None: sys.path[:], sys.meta_path[:] = self.__saved @final class Pytester: """ Facilities to write tests/configuration files, execute pytest in isolation, and match against expected output, perfect for black-box testing of pytest plugins. It attempts to isolate the test run from external factors as much as possible, modifying the current working directory to :attr:`path` and environment variables during initialization. """ __test__ = False CLOSE_STDIN: "Final" = NOTSET class TimeoutExpired(Exception): pass def __init__( self, request: FixtureRequest, tmp_path_factory: TempPathFactory, monkeypatch: MonkeyPatch, *, _ispytest: bool = False, ) -> None: check_ispytest(_ispytest) self._request = request self._mod_collections: WeakKeyDictionary[ Collector, List[Union[Item, Collector]] ] = WeakKeyDictionary() if request.function: name: str = request.function.__name__ else: name = request.node.name self._name = name self._path: Path = tmp_path_factory.mktemp(name, numbered=True) #: A list of plugins to use with :py:meth:`parseconfig` and #: :py:meth:`runpytest`. Initially this is an empty list but plugins can #: be added to the list. The type of items to add to the list depends on #: the method using them so refer to them for details. self.plugins: List[Union[str, _PluggyPlugin]] = [] self._cwd_snapshot = CwdSnapshot() self._sys_path_snapshot = SysPathsSnapshot() self._sys_modules_snapshot = self.__take_sys_modules_snapshot() self.chdir() self._request.addfinalizer(self._finalize) self._method = self._request.config.getoption("--runpytest") self._test_tmproot = tmp_path_factory.mktemp(f"tmp-{name}", numbered=True) self._monkeypatch = mp = monkeypatch mp.setenv("PYTEST_DEBUG_TEMPROOT", str(self._test_tmproot)) # Ensure no unexpected caching via tox. mp.delenv("TOX_ENV_DIR", raising=False) # Discard outer pytest options. mp.delenv("PYTEST_ADDOPTS", raising=False) # Ensure no user config is used. tmphome = str(self.path) mp.setenv("HOME", tmphome) mp.setenv("USERPROFILE", tmphome) # Do not use colors for inner runs by default. mp.setenv("PY_COLORS", "0") @property def path(self) -> Path: """Temporary directory path used to create files/run tests from, etc.""" return self._path def __repr__(self) -> str: return f"<Pytester {self.path!r}>" def _finalize(self) -> None: """ Clean up global state artifacts. Some methods modify the global interpreter state and this tries to clean this up. It does not remove the temporary directory however so it can be looked at after the test run has finished. """ self._sys_modules_snapshot.restore() self._sys_path_snapshot.restore() self._cwd_snapshot.restore() def __take_sys_modules_snapshot(self) -> SysModulesSnapshot: # Some zope modules used by twisted-related tests keep internal state # and can't be deleted; we had some trouble in the past with # `zope.interface` for example. # # Preserve readline due to https://bugs.python.org/issue41033. # pexpect issues a SIGWINCH. def preserve_module(name): return name.startswith(("zope", "readline")) return SysModulesSnapshot(preserve=preserve_module) def make_hook_recorder(self, pluginmanager: PytestPluginManager) -> HookRecorder: """Create a new :class:`HookRecorder` for a :class:`PytestPluginManager`.""" pluginmanager.reprec = reprec = HookRecorder(pluginmanager, _ispytest=True) self._request.addfinalizer(reprec.finish_recording) return reprec def chdir(self) -> None: """Cd into the temporary directory. This is done automatically upon instantiation. """ os.chdir(self.path) def _makefile( self, ext: str, lines: Sequence[Union[Any, bytes]], files: Dict[str, str], encoding: str = "utf-8", ) -> Path: items = list(files.items()) if ext and not ext.startswith("."): raise ValueError( f"pytester.makefile expects a file extension, try .{ext} instead of {ext}" ) def to_text(s: Union[Any, bytes]) -> str: return s.decode(encoding) if isinstance(s, bytes) else str(s) if lines: source = "\n".join(to_text(x) for x in lines) basename = self._name items.insert(0, (basename, source)) ret = None for basename, value in items: p = self.path.joinpath(basename).with_suffix(ext) p.parent.mkdir(parents=True, exist_ok=True) source_ = Source(value) source = "\n".join(to_text(line) for line in source_.lines) p.write_text(source.strip(), encoding=encoding) if ret is None: ret = p assert ret is not None return ret def makefile(self, ext: str, *args: str, **kwargs: str) -> Path: r"""Create new text file(s) in the test directory. :param ext: The extension the file(s) should use, including the dot, e.g. `.py`. :param args: All args are treated as strings and joined using newlines. The result is written as contents to the file. The name of the file is based on the test function requesting this fixture. :param kwargs: Each keyword is the name of a file, while the value of it will be written as contents of the file. :returns: The first created file. Examples: .. code-block:: python pytester.makefile(".txt", "line1", "line2") pytester.makefile(".ini", pytest="[pytest]\naddopts=-rs\n") To create binary files, use :meth:`pathlib.Path.write_bytes` directly: .. code-block:: python filename = pytester.path.joinpath("foo.bin") filename.write_bytes(b"...") """ return self._makefile(ext, args, kwargs) def makeconftest(self, source: str) -> Path: """Write a contest.py file. :param source: The contents. :returns: The conftest.py file. """ return self.makepyfile(conftest=source) def makeini(self, source: str) -> Path: """Write a tox.ini file. :param source: The contents. :returns: The tox.ini file. """ return self.makefile(".ini", tox=source) def getinicfg(self, source: str) -> SectionWrapper: """Return the pytest section from the tox.ini config file.""" p = self.makeini(source) return IniConfig(str(p))["pytest"] def makepyprojecttoml(self, source: str) -> Path: """Write a pyproject.toml file. :param source: The contents. :returns: The pyproject.ini file. .. versionadded:: 6.0 """ return self.makefile(".toml", pyproject=source) def makepyfile(self, *args, **kwargs) -> Path: r"""Shortcut for .makefile() with a .py extension. Defaults to the test name with a '.py' extension, e.g test_foobar.py, overwriting existing files. Examples: .. code-block:: python def test_something(pytester): # Initial file is created test_something.py. pytester.makepyfile("foobar") # To create multiple files, pass kwargs accordingly. pytester.makepyfile(custom="foobar") # At this point, both 'test_something.py' & 'custom.py' exist in the test directory. """ return self._makefile(".py", args, kwargs) def maketxtfile(self, *args, **kwargs) -> Path: r"""Shortcut for .makefile() with a .txt extension. Defaults to the test name with a '.txt' extension, e.g test_foobar.txt, overwriting existing files. Examples: .. code-block:: python def test_something(pytester): # Initial file is created test_something.txt. pytester.maketxtfile("foobar") # To create multiple files, pass kwargs accordingly. pytester.maketxtfile(custom="foobar") # At this point, both 'test_something.txt' & 'custom.txt' exist in the test directory. """ return self._makefile(".txt", args, kwargs) def syspathinsert( self, path: Optional[Union[str, "os.PathLike[str]"]] = None ) -> None: """Prepend a directory to sys.path, defaults to :attr:`path`. This is undone automatically when this object dies at the end of each test. :param path: The path. """ if path is None: path = self.path self._monkeypatch.syspath_prepend(str(path)) def mkdir(self, name: Union[str, "os.PathLike[str]"]) -> Path: """Create a new (sub)directory. :param name: The name of the directory, relative to the pytester path. :returns: The created directory. """ p = self.path / name p.mkdir() return p def mkpydir(self, name: Union[str, "os.PathLike[str]"]) -> Path: """Create a new python package. This creates a (sub)directory with an empty ``__init__.py`` file so it gets recognised as a Python package. """ p = self.path / name p.mkdir() p.joinpath("__init__.py").touch() return p def copy_example(self, name: Optional[str] = None) -> Path: """Copy file from project's directory into the testdir. :param name: The name of the file to copy. :return: Path to the copied directory (inside ``self.path``). """ example_dir_ = self._request.config.getini("pytester_example_dir") if example_dir_ is None: raise ValueError("pytester_example_dir is unset, can't copy examples") example_dir: Path = self._request.config.rootpath / example_dir_ for extra_element in self._request.node.iter_markers("pytester_example_path"): assert extra_element.args example_dir = example_dir.joinpath(*extra_element.args) if name is None: func_name = self._name maybe_dir = example_dir / func_name maybe_file = example_dir / (func_name + ".py") if maybe_dir.is_dir(): example_path = maybe_dir elif maybe_file.is_file(): example_path = maybe_file else: raise LookupError( f"{func_name} can't be found as module or package in {example_dir}" ) else: example_path = example_dir.joinpath(name) if example_path.is_dir() and not example_path.joinpath("__init__.py").is_file(): copytree(example_path, self.path) return self.path elif example_path.is_file(): result = self.path.joinpath(example_path.name) shutil.copy(example_path, result) return result else: raise LookupError( f'example "{example_path}" is not found as a file or directory' ) def getnode( self, config: Config, arg: Union[str, "os.PathLike[str]"] ) -> Union[Collector, Item]: """Get the collection node of a file. :param config: A pytest config. See :py:meth:`parseconfig` and :py:meth:`parseconfigure` for creating it. :param arg: Path to the file. :returns: The node. """ session = Session.from_config(config) assert "::" not in str(arg) p = Path(os.path.abspath(arg)) config.hook.pytest_sessionstart(session=session) res = session.perform_collect([str(p)], genitems=False)[0] config.hook.pytest_sessionfinish(session=session, exitstatus=ExitCode.OK) return res def getpathnode( self, path: Union[str, "os.PathLike[str]"] ) -> Union[Collector, Item]: """Return the collection node of a file. This is like :py:meth:`getnode` but uses :py:meth:`parseconfigure` to create the (configured) pytest Config instance. :param path: Path to the file. :returns: The node. """ path = Path(path) config = self.parseconfigure(path) session = Session.from_config(config) x = bestrelpath(session.path, path) config.hook.pytest_sessionstart(session=session) res = session.perform_collect([x], genitems=False)[0] config.hook.pytest_sessionfinish(session=session, exitstatus=ExitCode.OK) return res def genitems(self, colitems: Sequence[Union[Item, Collector]]) -> List[Item]: """Generate all test items from a collection node. This recurses into the collection node and returns a list of all the test items contained within. :param colitems: The collection nodes. :returns: The collected items. """ session = colitems[0].session result: List[Item] = [] for colitem in colitems: result.extend(session.genitems(colitem)) return result def runitem(self, source: str) -> Any: """Run the "test_func" Item. The calling test instance (class containing the test method) must provide a ``.getrunner()`` method which should return a runner which can run the test protocol for a single item, e.g. :py:func:`_pytest.runner.runtestprotocol`. """ # used from runner functional tests item = self.getitem(source) # the test class where we are called from wants to provide the runner testclassinstance = self._request.instance runner = testclassinstance.getrunner() return runner(item) def inline_runsource(self, source: str, *cmdlineargs) -> HookRecorder: """Run a test module in process using ``pytest.main()``. This run writes "source" into a temporary file and runs ``pytest.main()`` on it, returning a :py:class:`HookRecorder` instance for the result. :param source: The source code of the test module. :param cmdlineargs: Any extra command line arguments to use. """ p = self.makepyfile(source) values = list(cmdlineargs) + [p] return self.inline_run(*values) def inline_genitems(self, *args) -> Tuple[List[Item], HookRecorder]: """Run ``pytest.main(['--collectonly'])`` in-process. Runs the :py:func:`pytest.main` function to run all of pytest inside the test process itself like :py:meth:`inline_run`, but returns a tuple of the collected items and a :py:class:`HookRecorder` instance. """ rec = self.inline_run("--collect-only", *args) items = [x.item for x in rec.getcalls("pytest_itemcollected")] return items, rec def inline_run( self, *args: Union[str, "os.PathLike[str]"], plugins=(), no_reraise_ctrlc: bool = False, ) -> HookRecorder: """Run ``pytest.main()`` in-process, returning a HookRecorder. Runs the :py:func:`pytest.main` function to run all of pytest inside the test process itself. This means it can return a :py:class:`HookRecorder` instance which gives more detailed results from that run than can be done by matching stdout/stderr from :py:meth:`runpytest`. :param args: Command line arguments to pass to :py:func:`pytest.main`. :param plugins: Extra plugin instances the ``pytest.main()`` instance should use. :param no_reraise_ctrlc: Typically we reraise keyboard interrupts from the child run. If True, the KeyboardInterrupt exception is captured. """ # (maybe a cpython bug?) the importlib cache sometimes isn't updated # properly between file creation and inline_run (especially if imports # are interspersed with file creation) importlib.invalidate_caches() plugins = list(plugins) finalizers = [] try: # Any sys.module or sys.path changes done while running pytest # inline should be reverted after the test run completes to avoid # clashing with later inline tests run within the same pytest test, # e.g. just because they use matching test module names. finalizers.append(self.__take_sys_modules_snapshot().restore) finalizers.append(SysPathsSnapshot().restore) # Important note: # - our tests should not leave any other references/registrations # laying around other than possibly loaded test modules # referenced from sys.modules, as nothing will clean those up # automatically rec = [] class Collect: def pytest_configure(x, config: Config) -> None: rec.append(self.make_hook_recorder(config.pluginmanager)) plugins.append(Collect()) ret = main([str(x) for x in args], plugins=plugins) if len(rec) == 1: reprec = rec.pop() else: class reprec: # type: ignore pass reprec.ret = ret # Typically we reraise keyboard interrupts from the child run # because it's our user requesting interruption of the testing. if ret == ExitCode.INTERRUPTED and not no_reraise_ctrlc: calls = reprec.getcalls("pytest_keyboard_interrupt") if calls and calls[-1].excinfo.type == KeyboardInterrupt: raise KeyboardInterrupt() return reprec finally: for finalizer in finalizers: finalizer() def runpytest_inprocess( self, *args: Union[str, "os.PathLike[str]"], **kwargs: Any ) -> RunResult: """Return result of running pytest in-process, providing a similar interface to what self.runpytest() provides.""" syspathinsert = kwargs.pop("syspathinsert", False) if syspathinsert: self.syspathinsert() now = timing.time() capture = _get_multicapture("sys") capture.start_capturing() try: try: reprec = self.inline_run(*args, **kwargs) except SystemExit as e: ret = e.args[0] try: ret = ExitCode(e.args[0]) except ValueError: pass class reprec: # type: ignore ret = ret except Exception: traceback.print_exc() class reprec: # type: ignore ret = ExitCode(3) finally: out, err = capture.readouterr() capture.stop_capturing() sys.stdout.write(out) sys.stderr.write(err) assert reprec.ret is not None res = RunResult( reprec.ret, out.splitlines(), err.splitlines(), timing.time() - now ) res.reprec = reprec # type: ignore return res def runpytest( self, *args: Union[str, "os.PathLike[str]"], **kwargs: Any ) -> RunResult: """Run pytest inline or in a subprocess, depending on the command line option "--runpytest" and return a :py:class:`~pytest.RunResult`.""" new_args = self._ensure_basetemp(args) if self._method == "inprocess": return self.runpytest_inprocess(*new_args, **kwargs) elif self._method == "subprocess": return self.runpytest_subprocess(*new_args, **kwargs) raise RuntimeError(f"Unrecognized runpytest option: {self._method}") def _ensure_basetemp( self, args: Sequence[Union[str, "os.PathLike[str]"]] ) -> List[Union[str, "os.PathLike[str]"]]: new_args = list(args) for x in new_args: if str(x).startswith("--basetemp"): break else: new_args.append("--basetemp=%s" % self.path.parent.joinpath("basetemp")) return new_args def parseconfig(self, *args: Union[str, "os.PathLike[str]"]) -> Config: """Return a new pytest :class:`pytest.Config` instance from given commandline args. This invokes the pytest bootstrapping code in _pytest.config to create a new :py:class:`pytest.PytestPluginManager` and call the :hook:`pytest_cmdline_parse` hook to create a new :class:`pytest.Config` instance. If :attr:`plugins` has been populated they should be plugin modules to be registered with the plugin manager. """ import _pytest.config new_args = self._ensure_basetemp(args) new_args = [str(x) for x in new_args] config = _pytest.config._prepareconfig(new_args, self.plugins) # type: ignore[arg-type] # we don't know what the test will do with this half-setup config # object and thus we make sure it gets unconfigured properly in any # case (otherwise capturing could still be active, for example) self._request.addfinalizer(config._ensure_unconfigure) return config def parseconfigure(self, *args: Union[str, "os.PathLike[str]"]) -> Config: """Return a new pytest configured Config instance. Returns a new :py:class:`pytest.Config` instance like :py:meth:`parseconfig`, but also calls the :hook:`pytest_configure` hook. """ config = self.parseconfig(*args) config._do_configure() return config def getitem( self, source: Union[str, "os.PathLike[str]"], funcname: str = "test_func" ) -> Item: """Return the test item for a test function. Writes the source to a python file and runs pytest's collection on the resulting module, returning the test item for the requested function name. :param source: The module source. :param funcname: The name of the test function for which to return a test item. :returns: The test item. """ items = self.getitems(source) for item in items: if item.name == funcname: return item assert 0, "{!r} item not found in module:\n{}\nitems: {}".format( funcname, source, items ) def getitems(self, source: Union[str, "os.PathLike[str]"]) -> List[Item]: """Return all test items collected from the module. Writes the source to a Python file and runs pytest's collection on the resulting module, returning all test items contained within. """ modcol = self.getmodulecol(source) return self.genitems([modcol]) def getmodulecol( self, source: Union[str, "os.PathLike[str]"], configargs=(), *, withinit: bool = False, ): """Return the module collection node for ``source``. Writes ``source`` to a file using :py:meth:`makepyfile` and then runs the pytest collection on it, returning the collection node for the test module. :param source: The source code of the module to collect. :param configargs: Any extra arguments to pass to :py:meth:`parseconfigure`. :param withinit: Whether to also write an ``__init__.py`` file to the same directory to ensure it is a package. """ if isinstance(source, os.PathLike): path = self.path.joinpath(source) assert not withinit, "not supported for paths" else: kw = {self._name: str(source)} path = self.makepyfile(**kw) if withinit: self.makepyfile(__init__="#") self.config = config = self.parseconfigure(path, *configargs) return self.getnode(config, path) def collect_by_name( self, modcol: Collector, name: str ) -> Optional[Union[Item, Collector]]: """Return the collection node for name from the module collection. Searches a module collection node for a collection node matching the given name. :param modcol: A module collection node; see :py:meth:`getmodulecol`. :param name: The name of the node to return. """ if modcol not in self._mod_collections: self._mod_collections[modcol] = list(modcol.collect()) for colitem in self._mod_collections[modcol]: if colitem.name == name: return colitem return None def popen( self, cmdargs: Sequence[Union[str, "os.PathLike[str]"]], stdout: Union[int, TextIO] = subprocess.PIPE, stderr: Union[int, TextIO] = subprocess.PIPE, stdin: Union[NotSetType, bytes, IO[Any], int] = CLOSE_STDIN, **kw, ): """Invoke :py:class:`subprocess.Popen`. Calls :py:class:`subprocess.Popen` making sure the current working directory is in ``PYTHONPATH``. You probably want to use :py:meth:`run` instead. """ env = os.environ.copy() env["PYTHONPATH"] = os.pathsep.join( filter(None, [os.getcwd(), env.get("PYTHONPATH", "")]) ) kw["env"] = env if stdin is self.CLOSE_STDIN: kw["stdin"] = subprocess.PIPE elif isinstance(stdin, bytes): kw["stdin"] = subprocess.PIPE else: kw["stdin"] = stdin popen = subprocess.Popen(cmdargs, stdout=stdout, stderr=stderr, **kw) if stdin is self.CLOSE_STDIN: assert popen.stdin is not None popen.stdin.close() elif isinstance(stdin, bytes): assert popen.stdin is not None popen.stdin.write(stdin) return popen def run( self, *cmdargs: Union[str, "os.PathLike[str]"], timeout: Optional[float] = None, stdin: Union[NotSetType, bytes, IO[Any], int] = CLOSE_STDIN, ) -> RunResult: """Run a command with arguments. Run a process using :py:class:`subprocess.Popen` saving the stdout and stderr. :param cmdargs: The sequence of arguments to pass to :py:class:`subprocess.Popen`, with path-like objects being converted to :py:class:`str` automatically. :param timeout: The period in seconds after which to timeout and raise :py:class:`Pytester.TimeoutExpired`. :param stdin: Optional standard input. - If it is :py:attr:`CLOSE_STDIN` (Default), then this method calls :py:class:`subprocess.Popen` with ``stdin=subprocess.PIPE``, and the standard input is closed immediately after the new command is started. - If it is of type :py:class:`bytes`, these bytes are sent to the standard input of the command. - Otherwise, it is passed through to :py:class:`subprocess.Popen`. For further information in this case, consult the document of the ``stdin`` parameter in :py:class:`subprocess.Popen`. :returns: The result. """ __tracebackhide__ = True cmdargs = tuple(os.fspath(arg) for arg in cmdargs) p1 = self.path.joinpath("stdout") p2 = self.path.joinpath("stderr") print("running:", *cmdargs) print(" in:", Path.cwd()) with p1.open("w", encoding="utf8") as f1, p2.open("w", encoding="utf8") as f2: now = timing.time() popen = self.popen( cmdargs, stdin=stdin, stdout=f1, stderr=f2, close_fds=(sys.platform != "win32"), ) if popen.stdin is not None: popen.stdin.close() def handle_timeout() -> None: __tracebackhide__ = True timeout_message = ( "{seconds} second timeout expired running:" " {command}".format(seconds=timeout, command=cmdargs) ) popen.kill() popen.wait() raise self.TimeoutExpired(timeout_message) if timeout is None: ret = popen.wait() else: try: ret = popen.wait(timeout) except subprocess.TimeoutExpired: handle_timeout() with p1.open(encoding="utf8") as f1, p2.open(encoding="utf8") as f2: out = f1.read().splitlines() err = f2.read().splitlines() self._dump_lines(out, sys.stdout) self._dump_lines(err, sys.stderr) with contextlib.suppress(ValueError): ret = ExitCode(ret) return RunResult(ret, out, err, timing.time() - now) def _dump_lines(self, lines, fp): try: for line in lines: print(line, file=fp) except UnicodeEncodeError: print(f"couldn't print to {fp} because of encoding") def _getpytestargs(self) -> Tuple[str, ...]: return sys.executable, "-mpytest" def runpython(self, script: "os.PathLike[str]") -> RunResult: """Run a python script using sys.executable as interpreter.""" return self.run(sys.executable, script) def runpython_c(self, command: str) -> RunResult: """Run ``python -c "command"``.""" return self.run(sys.executable, "-c", command) def runpytest_subprocess( self, *args: Union[str, "os.PathLike[str]"], timeout: Optional[float] = None ) -> RunResult: """Run pytest as a subprocess with given arguments. Any plugins added to the :py:attr:`plugins` list will be added using the ``-p`` command line option. Additionally ``--basetemp`` is used to put any temporary files and directories in a numbered directory prefixed with "runpytest-" to not conflict with the normal numbered pytest location for temporary files and directories. :param args: The sequence of arguments to pass to the pytest subprocess. :param timeout: The period in seconds after which to timeout and raise :py:class:`Pytester.TimeoutExpired`. :returns: The result. """ __tracebackhide__ = True p = make_numbered_dir(root=self.path, prefix="runpytest-", mode=0o700) args = ("--basetemp=%s" % p,) + args plugins = [x for x in self.plugins if isinstance(x, str)] if plugins: args = ("-p", plugins[0]) + args args = self._getpytestargs() + args return self.run(*args, timeout=timeout) def spawn_pytest( self, string: str, expect_timeout: float = 10.0 ) -> "pexpect.spawn": """Run pytest using pexpect. This makes sure to use the right pytest and sets up the temporary directory locations. The pexpect child is returned. """ basetemp = self.path / "temp-pexpect" basetemp.mkdir(mode=0o700) invoke = " ".join(map(str, self._getpytestargs())) cmd = f"{invoke} --basetemp={basetemp} {string}" return self.spawn(cmd, expect_timeout=expect_timeout) def spawn(self, cmd: str, expect_timeout: float = 10.0) -> "pexpect.spawn": """Run a command using pexpect. The pexpect child is returned. """ pexpect = importorskip("pexpect", "3.0") if hasattr(sys, "pypy_version_info") and "64" in platform.machine(): skip("pypy-64 bit not supported") if not hasattr(pexpect, "spawn"): skip("pexpect.spawn not available") logfile = self.path.joinpath("spawn.out").open("wb") child = pexpect.spawn(cmd, logfile=logfile, timeout=expect_timeout) self._request.addfinalizer(logfile.close) return child class LineComp: def __init__(self) -> None: self.stringio = StringIO() """:class:`python:io.StringIO()` instance used for input.""" def assert_contains_lines(self, lines2: Sequence[str]) -> None: """Assert that ``lines2`` are contained (linearly) in :attr:`stringio`'s value. Lines are matched using :func:`LineMatcher.fnmatch_lines <pytest.LineMatcher.fnmatch_lines>`. """ __tracebackhide__ = True val = self.stringio.getvalue() self.stringio.truncate(0) self.stringio.seek(0) lines1 = val.split("\n") LineMatcher(lines1).fnmatch_lines(lines2) class LineMatcher: """Flexible matching of text. This is a convenience class to test large texts like the output of commands. The constructor takes a list of lines without their trailing newlines, i.e. ``text.splitlines()``. """ def __init__(self, lines: List[str]) -> None: self.lines = lines self._log_output: List[str] = [] def __str__(self) -> str: """Return the entire original text. .. versionadded:: 6.2 You can use :meth:`str` in older versions. """ return "\n".join(self.lines) def _getlines(self, lines2: Union[str, Sequence[str], Source]) -> Sequence[str]: if isinstance(lines2, str): lines2 = Source(lines2) if isinstance(lines2, Source): lines2 = lines2.strip().lines return lines2 def fnmatch_lines_random(self, lines2: Sequence[str]) -> None: """Check lines exist in the output in any order (using :func:`python:fnmatch.fnmatch`).""" __tracebackhide__ = True self._match_lines_random(lines2, fnmatch) def re_match_lines_random(self, lines2: Sequence[str]) -> None: """Check lines exist in the output in any order (using :func:`python:re.match`).""" __tracebackhide__ = True self._match_lines_random(lines2, lambda name, pat: bool(re.match(pat, name))) def _match_lines_random( self, lines2: Sequence[str], match_func: Callable[[str, str], bool] ) -> None: __tracebackhide__ = True lines2 = self._getlines(lines2) for line in lines2: for x in self.lines: if line == x or match_func(x, line): self._log("matched: ", repr(line)) break else: msg = "line %r not found in output" % line self._log(msg) self._fail(msg) def get_lines_after(self, fnline: str) -> Sequence[str]: """Return all lines following the given line in the text. The given line can contain glob wildcards. """ for i, line in enumerate(self.lines): if fnline == line or fnmatch(line, fnline): return self.lines[i + 1 :] raise ValueError("line %r not found in output" % fnline) def _log(self, *args) -> None: self._log_output.append(" ".join(str(x) for x in args)) @property def _log_text(self) -> str: return "\n".join(self._log_output) def fnmatch_lines( self, lines2: Sequence[str], *, consecutive: bool = False ) -> None: """Check lines exist in the output (using :func:`python:fnmatch.fnmatch`). The argument is a list of lines which have to match and can use glob wildcards. If they do not match a pytest.fail() is called. The matches and non-matches are also shown as part of the error message. :param lines2: String patterns to match. :param consecutive: Match lines consecutively? """ __tracebackhide__ = True self._match_lines(lines2, fnmatch, "fnmatch", consecutive=consecutive) def re_match_lines( self, lines2: Sequence[str], *, consecutive: bool = False ) -> None: """Check lines exist in the output (using :func:`python:re.match`). The argument is a list of lines which have to match using ``re.match``. If they do not match a pytest.fail() is called. The matches and non-matches are also shown as part of the error message. :param lines2: string patterns to match. :param consecutive: match lines consecutively? """ __tracebackhide__ = True self._match_lines( lines2, lambda name, pat: bool(re.match(pat, name)), "re.match", consecutive=consecutive, ) def _match_lines( self, lines2: Sequence[str], match_func: Callable[[str, str], bool], match_nickname: str, *, consecutive: bool = False, ) -> None: """Underlying implementation of ``fnmatch_lines`` and ``re_match_lines``. :param Sequence[str] lines2: List of string patterns to match. The actual format depends on ``match_func``. :param match_func: A callable ``match_func(line, pattern)`` where line is the captured line from stdout/stderr and pattern is the matching pattern. :param str match_nickname: The nickname for the match function that will be logged to stdout when a match occurs. :param consecutive: Match lines consecutively? """ if not isinstance(lines2, collections.abc.Sequence): raise TypeError(f"invalid type for lines2: {type(lines2).__name__}") lines2 = self._getlines(lines2) lines1 = self.lines[:] extralines = [] __tracebackhide__ = True wnick = len(match_nickname) + 1 started = False for line in lines2: nomatchprinted = False while lines1: nextline = lines1.pop(0) if line == nextline: self._log("exact match:", repr(line)) started = True break elif match_func(nextline, line): self._log("%s:" % match_nickname, repr(line)) self._log( "{:>{width}}".format("with:", width=wnick), repr(nextline) ) started = True break else: if consecutive and started: msg = f"no consecutive match: {line!r}" self._log(msg) self._log( "{:>{width}}".format("with:", width=wnick), repr(nextline) ) self._fail(msg) if not nomatchprinted: self._log( "{:>{width}}".format("nomatch:", width=wnick), repr(line) ) nomatchprinted = True self._log("{:>{width}}".format("and:", width=wnick), repr(nextline)) extralines.append(nextline) else: msg = f"remains unmatched: {line!r}" self._log(msg) self._fail(msg) self._log_output = [] def no_fnmatch_line(self, pat: str) -> None: """Ensure captured lines do not match the given pattern, using ``fnmatch.fnmatch``. :param str pat: The pattern to match lines. """ __tracebackhide__ = True self._no_match_line(pat, fnmatch, "fnmatch") def no_re_match_line(self, pat: str) -> None: """Ensure captured lines do not match the given pattern, using ``re.match``. :param str pat: The regular expression to match lines. """ __tracebackhide__ = True self._no_match_line( pat, lambda name, pat: bool(re.match(pat, name)), "re.match" ) def _no_match_line( self, pat: str, match_func: Callable[[str, str], bool], match_nickname: str ) -> None: """Ensure captured lines does not have a the given pattern, using ``fnmatch.fnmatch``. :param str pat: The pattern to match lines. """ __tracebackhide__ = True nomatch_printed = False wnick = len(match_nickname) + 1 for line in self.lines: if match_func(line, pat): msg = f"{match_nickname}: {pat!r}" self._log(msg) self._log("{:>{width}}".format("with:", width=wnick), repr(line)) self._fail(msg) else: if not nomatch_printed: self._log("{:>{width}}".format("nomatch:", width=wnick), repr(pat)) nomatch_printed = True self._log("{:>{width}}".format("and:", width=wnick), repr(line)) self._log_output = [] def _fail(self, msg: str) -> None: __tracebackhide__ = True log_text = self._log_text self._log_output = [] fail(log_text) def str(self) -> str: """Return the entire original text.""" return str(self)
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