725 lines
25 KiB
Python
725 lines
25 KiB
Python
"""Discover and run doctests in modules and test files."""
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import bdb
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import inspect
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import platform
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import sys
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import traceback
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import types
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import warnings
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from contextlib import contextmanager
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from typing import Any
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from typing import Callable
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from typing import Dict
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from typing import Generator
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from typing import Iterable
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from typing import List
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from typing import Optional
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from typing import Pattern
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from typing import Sequence
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from typing import Tuple
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from typing import Type
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from typing import TYPE_CHECKING
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from typing import Union
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import py.path
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import pytest
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from _pytest import outcomes
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from _pytest._code.code import ExceptionInfo
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from _pytest._code.code import ReprFileLocation
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from _pytest._code.code import TerminalRepr
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from _pytest._io import TerminalWriter
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from _pytest.compat import safe_getattr
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from _pytest.config import Config
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from _pytest.config.argparsing import Parser
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from _pytest.fixtures import FixtureRequest
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from _pytest.nodes import Collector
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from _pytest.outcomes import OutcomeException
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from _pytest.pathlib import import_path
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from _pytest.python_api import approx
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from _pytest.warning_types import PytestWarning
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if TYPE_CHECKING:
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import doctest
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DOCTEST_REPORT_CHOICE_NONE = "none"
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DOCTEST_REPORT_CHOICE_CDIFF = "cdiff"
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DOCTEST_REPORT_CHOICE_NDIFF = "ndiff"
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DOCTEST_REPORT_CHOICE_UDIFF = "udiff"
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DOCTEST_REPORT_CHOICE_ONLY_FIRST_FAILURE = "only_first_failure"
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DOCTEST_REPORT_CHOICES = (
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DOCTEST_REPORT_CHOICE_NONE,
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DOCTEST_REPORT_CHOICE_CDIFF,
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DOCTEST_REPORT_CHOICE_NDIFF,
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DOCTEST_REPORT_CHOICE_UDIFF,
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DOCTEST_REPORT_CHOICE_ONLY_FIRST_FAILURE,
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)
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# Lazy definition of runner class
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RUNNER_CLASS = None
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# Lazy definition of output checker class
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CHECKER_CLASS = None # type: Optional[Type[doctest.OutputChecker]]
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def pytest_addoption(parser: Parser) -> None:
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parser.addini(
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"doctest_optionflags",
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"option flags for doctests",
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type="args",
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default=["ELLIPSIS"],
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)
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parser.addini(
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"doctest_encoding", "encoding used for doctest files", default="utf-8"
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)
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group = parser.getgroup("collect")
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group.addoption(
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"--doctest-modules",
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action="store_true",
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default=False,
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help="run doctests in all .py modules",
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dest="doctestmodules",
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)
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group.addoption(
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"--doctest-report",
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type=str.lower,
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default="udiff",
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help="choose another output format for diffs on doctest failure",
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choices=DOCTEST_REPORT_CHOICES,
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dest="doctestreport",
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)
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group.addoption(
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"--doctest-glob",
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action="append",
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default=[],
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metavar="pat",
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help="doctests file matching pattern, default: test*.txt",
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dest="doctestglob",
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)
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group.addoption(
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"--doctest-ignore-import-errors",
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action="store_true",
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default=False,
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help="ignore doctest ImportErrors",
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dest="doctest_ignore_import_errors",
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)
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group.addoption(
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"--doctest-continue-on-failure",
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action="store_true",
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default=False,
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help="for a given doctest, continue to run after the first failure",
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dest="doctest_continue_on_failure",
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)
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def pytest_unconfigure() -> None:
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global RUNNER_CLASS
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RUNNER_CLASS = None
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def pytest_collect_file(
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path: py.path.local, parent: Collector,
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) -> Optional[Union["DoctestModule", "DoctestTextfile"]]:
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config = parent.config
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if path.ext == ".py":
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if config.option.doctestmodules and not _is_setup_py(path):
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mod = DoctestModule.from_parent(parent, fspath=path) # type: DoctestModule
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return mod
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elif _is_doctest(config, path, parent):
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txt = DoctestTextfile.from_parent(parent, fspath=path) # type: DoctestTextfile
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return txt
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return None
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def _is_setup_py(path: py.path.local) -> bool:
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if path.basename != "setup.py":
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return False
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contents = path.read_binary()
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return b"setuptools" in contents or b"distutils" in contents
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def _is_doctest(config: Config, path: py.path.local, parent) -> bool:
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if path.ext in (".txt", ".rst") and parent.session.isinitpath(path):
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return True
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globs = config.getoption("doctestglob") or ["test*.txt"]
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for glob in globs:
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if path.check(fnmatch=glob):
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return True
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return False
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class ReprFailDoctest(TerminalRepr):
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def __init__(
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self, reprlocation_lines: Sequence[Tuple[ReprFileLocation, Sequence[str]]]
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) -> None:
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self.reprlocation_lines = reprlocation_lines
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def toterminal(self, tw: TerminalWriter) -> None:
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for reprlocation, lines in self.reprlocation_lines:
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for line in lines:
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tw.line(line)
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reprlocation.toterminal(tw)
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class MultipleDoctestFailures(Exception):
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def __init__(self, failures: "Sequence[doctest.DocTestFailure]") -> None:
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super().__init__()
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self.failures = failures
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def _init_runner_class() -> Type["doctest.DocTestRunner"]:
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import doctest
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class PytestDoctestRunner(doctest.DebugRunner):
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"""Runner to collect failures.
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Note that the out variable in this case is a list instead of a
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stdout-like object.
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"""
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def __init__(
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self,
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checker: Optional[doctest.OutputChecker] = None,
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verbose: Optional[bool] = None,
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optionflags: int = 0,
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continue_on_failure: bool = True,
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) -> None:
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doctest.DebugRunner.__init__(
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self, checker=checker, verbose=verbose, optionflags=optionflags
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)
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self.continue_on_failure = continue_on_failure
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def report_failure(
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self, out, test: "doctest.DocTest", example: "doctest.Example", got: str,
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) -> None:
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failure = doctest.DocTestFailure(test, example, got)
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if self.continue_on_failure:
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out.append(failure)
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else:
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raise failure
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def report_unexpected_exception(
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self,
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out,
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test: "doctest.DocTest",
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example: "doctest.Example",
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exc_info: Tuple[Type[BaseException], BaseException, types.TracebackType],
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) -> None:
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if isinstance(exc_info[1], OutcomeException):
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raise exc_info[1]
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if isinstance(exc_info[1], bdb.BdbQuit):
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outcomes.exit("Quitting debugger")
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failure = doctest.UnexpectedException(test, example, exc_info)
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if self.continue_on_failure:
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out.append(failure)
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else:
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raise failure
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return PytestDoctestRunner
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def _get_runner(
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checker: Optional["doctest.OutputChecker"] = None,
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verbose: Optional[bool] = None,
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optionflags: int = 0,
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continue_on_failure: bool = True,
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) -> "doctest.DocTestRunner":
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# We need this in order to do a lazy import on doctest
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global RUNNER_CLASS
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if RUNNER_CLASS is None:
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RUNNER_CLASS = _init_runner_class()
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# Type ignored because the continue_on_failure argument is only defined on
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# PytestDoctestRunner, which is lazily defined so can't be used as a type.
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return RUNNER_CLASS( # type: ignore
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checker=checker,
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verbose=verbose,
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optionflags=optionflags,
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continue_on_failure=continue_on_failure,
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)
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class DoctestItem(pytest.Item):
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def __init__(
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self,
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name: str,
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parent: "Union[DoctestTextfile, DoctestModule]",
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runner: Optional["doctest.DocTestRunner"] = None,
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dtest: Optional["doctest.DocTest"] = None,
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) -> None:
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super().__init__(name, parent)
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self.runner = runner
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self.dtest = dtest
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self.obj = None
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self.fixture_request = None # type: Optional[FixtureRequest]
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@classmethod
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def from_parent( # type: ignore
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cls,
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parent: "Union[DoctestTextfile, DoctestModule]",
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*,
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name: str,
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runner: "doctest.DocTestRunner",
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dtest: "doctest.DocTest",
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):
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# incompatible signature due to to imposed limits on sublcass
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"""The public named constructor."""
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return super().from_parent(name=name, parent=parent, runner=runner, dtest=dtest)
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def setup(self) -> None:
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if self.dtest is not None:
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self.fixture_request = _setup_fixtures(self)
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globs = dict(getfixture=self.fixture_request.getfixturevalue)
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for name, value in self.fixture_request.getfixturevalue(
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"doctest_namespace"
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).items():
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globs[name] = value
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self.dtest.globs.update(globs)
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def runtest(self) -> None:
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assert self.dtest is not None
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assert self.runner is not None
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_check_all_skipped(self.dtest)
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self._disable_output_capturing_for_darwin()
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failures = [] # type: List[doctest.DocTestFailure]
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# Type ignored because we change the type of `out` from what
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# doctest expects.
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self.runner.run(self.dtest, out=failures) # type: ignore[arg-type]
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if failures:
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raise MultipleDoctestFailures(failures)
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def _disable_output_capturing_for_darwin(self) -> None:
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"""Disable output capturing. Otherwise, stdout is lost to doctest (#985)."""
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if platform.system() != "Darwin":
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return
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capman = self.config.pluginmanager.getplugin("capturemanager")
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if capman:
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capman.suspend_global_capture(in_=True)
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out, err = capman.read_global_capture()
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sys.stdout.write(out)
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sys.stderr.write(err)
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# TODO: Type ignored -- breaks Liskov Substitution.
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def repr_failure( # type: ignore[override]
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self, excinfo: ExceptionInfo[BaseException],
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) -> Union[str, TerminalRepr]:
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import doctest
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failures = (
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None
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) # type: Optional[Sequence[Union[doctest.DocTestFailure, doctest.UnexpectedException]]]
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if isinstance(
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excinfo.value, (doctest.DocTestFailure, doctest.UnexpectedException)
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):
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failures = [excinfo.value]
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elif isinstance(excinfo.value, MultipleDoctestFailures):
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failures = excinfo.value.failures
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if failures is not None:
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reprlocation_lines = []
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for failure in failures:
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example = failure.example
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test = failure.test
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filename = test.filename
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if test.lineno is None:
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lineno = None
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else:
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lineno = test.lineno + example.lineno + 1
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message = type(failure).__name__
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# TODO: ReprFileLocation doesn't expect a None lineno.
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reprlocation = ReprFileLocation(filename, lineno, message) # type: ignore[arg-type]
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checker = _get_checker()
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report_choice = _get_report_choice(
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self.config.getoption("doctestreport")
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)
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if lineno is not None:
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assert failure.test.docstring is not None
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lines = failure.test.docstring.splitlines(False)
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# add line numbers to the left of the error message
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assert test.lineno is not None
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lines = [
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"%03d %s" % (i + test.lineno + 1, x)
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for (i, x) in enumerate(lines)
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]
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# trim docstring error lines to 10
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lines = lines[max(example.lineno - 9, 0) : example.lineno + 1]
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else:
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lines = [
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"EXAMPLE LOCATION UNKNOWN, not showing all tests of that example"
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]
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indent = ">>>"
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for line in example.source.splitlines():
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lines.append("??? {} {}".format(indent, line))
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indent = "..."
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if isinstance(failure, doctest.DocTestFailure):
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lines += checker.output_difference(
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example, failure.got, report_choice
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).split("\n")
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else:
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inner_excinfo = ExceptionInfo(failure.exc_info)
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lines += ["UNEXPECTED EXCEPTION: %s" % repr(inner_excinfo.value)]
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lines += [
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x.strip("\n")
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for x in traceback.format_exception(*failure.exc_info)
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]
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reprlocation_lines.append((reprlocation, lines))
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return ReprFailDoctest(reprlocation_lines)
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else:
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return super().repr_failure(excinfo)
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def reportinfo(self):
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assert self.dtest is not None
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return self.fspath, self.dtest.lineno, "[doctest] %s" % self.name
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def _get_flag_lookup() -> Dict[str, int]:
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import doctest
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return dict(
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DONT_ACCEPT_TRUE_FOR_1=doctest.DONT_ACCEPT_TRUE_FOR_1,
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DONT_ACCEPT_BLANKLINE=doctest.DONT_ACCEPT_BLANKLINE,
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NORMALIZE_WHITESPACE=doctest.NORMALIZE_WHITESPACE,
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ELLIPSIS=doctest.ELLIPSIS,
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IGNORE_EXCEPTION_DETAIL=doctest.IGNORE_EXCEPTION_DETAIL,
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COMPARISON_FLAGS=doctest.COMPARISON_FLAGS,
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ALLOW_UNICODE=_get_allow_unicode_flag(),
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ALLOW_BYTES=_get_allow_bytes_flag(),
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NUMBER=_get_number_flag(),
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)
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def get_optionflags(parent):
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optionflags_str = parent.config.getini("doctest_optionflags")
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flag_lookup_table = _get_flag_lookup()
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flag_acc = 0
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for flag in optionflags_str:
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flag_acc |= flag_lookup_table[flag]
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return flag_acc
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def _get_continue_on_failure(config):
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continue_on_failure = config.getvalue("doctest_continue_on_failure")
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if continue_on_failure:
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# We need to turn off this if we use pdb since we should stop at
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# the first failure.
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if config.getvalue("usepdb"):
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continue_on_failure = False
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return continue_on_failure
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class DoctestTextfile(pytest.Module):
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obj = None
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def collect(self) -> Iterable[DoctestItem]:
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import doctest
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# Inspired by doctest.testfile; ideally we would use it directly,
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# but it doesn't support passing a custom checker.
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encoding = self.config.getini("doctest_encoding")
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text = self.fspath.read_text(encoding)
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filename = str(self.fspath)
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name = self.fspath.basename
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globs = {"__name__": "__main__"}
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optionflags = get_optionflags(self)
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runner = _get_runner(
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verbose=False,
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optionflags=optionflags,
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checker=_get_checker(),
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continue_on_failure=_get_continue_on_failure(self.config),
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)
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parser = doctest.DocTestParser()
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test = parser.get_doctest(text, globs, name, filename, 0)
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if test.examples:
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yield DoctestItem.from_parent(
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self, name=test.name, runner=runner, dtest=test
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)
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def _check_all_skipped(test: "doctest.DocTest") -> None:
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"""Raise pytest.skip() if all examples in the given DocTest have the SKIP
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option set."""
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import doctest
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all_skipped = all(x.options.get(doctest.SKIP, False) for x in test.examples)
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if all_skipped:
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pytest.skip("all tests skipped by +SKIP option")
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def _is_mocked(obj: object) -> bool:
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"""Return if an object is possibly a mock object by checking the
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existence of a highly improbable attribute."""
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return (
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safe_getattr(obj, "pytest_mock_example_attribute_that_shouldnt_exist", None)
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is not None
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)
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@contextmanager
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def _patch_unwrap_mock_aware() -> Generator[None, None, None]:
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"""Context manager which replaces ``inspect.unwrap`` with a version
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that's aware of mock objects and doesn't recurse into them."""
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real_unwrap = inspect.unwrap
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def _mock_aware_unwrap(
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func: Callable[..., Any], *, stop: Optional[Callable[[Any], Any]] = None
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) -> Any:
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try:
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if stop is None or stop is _is_mocked:
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return real_unwrap(func, stop=_is_mocked)
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_stop = stop
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return real_unwrap(func, stop=lambda obj: _is_mocked(obj) or _stop(func))
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except Exception as e:
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warnings.warn(
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"Got %r when unwrapping %r. This is usually caused "
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"by a violation of Python's object protocol; see e.g. "
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"https://github.com/pytest-dev/pytest/issues/5080" % (e, func),
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PytestWarning,
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)
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raise
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inspect.unwrap = _mock_aware_unwrap
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try:
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yield
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finally:
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inspect.unwrap = real_unwrap
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class DoctestModule(pytest.Module):
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def collect(self) -> Iterable[DoctestItem]:
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import doctest
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class MockAwareDocTestFinder(doctest.DocTestFinder):
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"""A hackish doctest finder that overrides stdlib internals to fix a stdlib bug.
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https://github.com/pytest-dev/pytest/issues/3456
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https://bugs.python.org/issue25532
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"""
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def _find_lineno(self, obj, source_lines):
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"""Doctest code does not take into account `@property`, this
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is a hackish way to fix it.
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https://bugs.python.org/issue17446
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"""
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if isinstance(obj, property):
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obj = getattr(obj, "fget", obj)
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# Type ignored because this is a private function.
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|
return doctest.DocTestFinder._find_lineno( # type: ignore
|
|
self, obj, source_lines,
|
|
)
|
|
|
|
def _find(
|
|
self, tests, obj, name, module, source_lines, globs, seen
|
|
) -> None:
|
|
if _is_mocked(obj):
|
|
return
|
|
with _patch_unwrap_mock_aware():
|
|
|
|
# Type ignored because this is a private function.
|
|
doctest.DocTestFinder._find( # type: ignore
|
|
self, tests, obj, name, module, source_lines, globs, seen
|
|
)
|
|
|
|
if self.fspath.basename == "conftest.py":
|
|
module = self.config.pluginmanager._importconftest(
|
|
self.fspath, self.config.getoption("importmode")
|
|
)
|
|
else:
|
|
try:
|
|
module = import_path(self.fspath)
|
|
except ImportError:
|
|
if self.config.getvalue("doctest_ignore_import_errors"):
|
|
pytest.skip("unable to import module %r" % self.fspath)
|
|
else:
|
|
raise
|
|
# Uses internal doctest module parsing mechanism.
|
|
finder = MockAwareDocTestFinder()
|
|
optionflags = get_optionflags(self)
|
|
runner = _get_runner(
|
|
verbose=False,
|
|
optionflags=optionflags,
|
|
checker=_get_checker(),
|
|
continue_on_failure=_get_continue_on_failure(self.config),
|
|
)
|
|
|
|
for test in finder.find(module, module.__name__):
|
|
if test.examples: # skip empty doctests
|
|
yield DoctestItem.from_parent(
|
|
self, name=test.name, runner=runner, dtest=test
|
|
)
|
|
|
|
|
|
def _setup_fixtures(doctest_item: DoctestItem) -> FixtureRequest:
|
|
"""Used by DoctestTextfile and DoctestItem to setup fixture information."""
|
|
|
|
def func() -> None:
|
|
pass
|
|
|
|
doctest_item.funcargs = {} # type: ignore[attr-defined]
|
|
fm = doctest_item.session._fixturemanager
|
|
doctest_item._fixtureinfo = fm.getfixtureinfo( # type: ignore[attr-defined]
|
|
node=doctest_item, func=func, cls=None, funcargs=False
|
|
)
|
|
fixture_request = FixtureRequest(doctest_item)
|
|
fixture_request._fillfixtures()
|
|
return fixture_request
|
|
|
|
|
|
def _init_checker_class() -> Type["doctest.OutputChecker"]:
|
|
import doctest
|
|
import re
|
|
|
|
class LiteralsOutputChecker(doctest.OutputChecker):
|
|
# Based on doctest_nose_plugin.py from the nltk project
|
|
# (https://github.com/nltk/nltk) and on the "numtest" doctest extension
|
|
# by Sebastien Boisgerault (https://github.com/boisgera/numtest).
|
|
|
|
_unicode_literal_re = re.compile(r"(\W|^)[uU]([rR]?[\'\"])", re.UNICODE)
|
|
_bytes_literal_re = re.compile(r"(\W|^)[bB]([rR]?[\'\"])", re.UNICODE)
|
|
_number_re = re.compile(
|
|
r"""
|
|
(?P<number>
|
|
(?P<mantissa>
|
|
(?P<integer1> [+-]?\d*)\.(?P<fraction>\d+)
|
|
|
|
|
(?P<integer2> [+-]?\d+)\.
|
|
)
|
|
(?:
|
|
[Ee]
|
|
(?P<exponent1> [+-]?\d+)
|
|
)?
|
|
|
|
|
(?P<integer3> [+-]?\d+)
|
|
(?:
|
|
[Ee]
|
|
(?P<exponent2> [+-]?\d+)
|
|
)
|
|
)
|
|
""",
|
|
re.VERBOSE,
|
|
)
|
|
|
|
def check_output(self, want: str, got: str, optionflags: int) -> bool:
|
|
if doctest.OutputChecker.check_output(self, want, got, optionflags):
|
|
return True
|
|
|
|
allow_unicode = optionflags & _get_allow_unicode_flag()
|
|
allow_bytes = optionflags & _get_allow_bytes_flag()
|
|
allow_number = optionflags & _get_number_flag()
|
|
|
|
if not allow_unicode and not allow_bytes and not allow_number:
|
|
return False
|
|
|
|
def remove_prefixes(regex: Pattern[str], txt: str) -> str:
|
|
return re.sub(regex, r"\1\2", txt)
|
|
|
|
if allow_unicode:
|
|
want = remove_prefixes(self._unicode_literal_re, want)
|
|
got = remove_prefixes(self._unicode_literal_re, got)
|
|
|
|
if allow_bytes:
|
|
want = remove_prefixes(self._bytes_literal_re, want)
|
|
got = remove_prefixes(self._bytes_literal_re, got)
|
|
|
|
if allow_number:
|
|
got = self._remove_unwanted_precision(want, got)
|
|
|
|
return doctest.OutputChecker.check_output(self, want, got, optionflags)
|
|
|
|
def _remove_unwanted_precision(self, want: str, got: str) -> str:
|
|
wants = list(self._number_re.finditer(want))
|
|
gots = list(self._number_re.finditer(got))
|
|
if len(wants) != len(gots):
|
|
return got
|
|
offset = 0
|
|
for w, g in zip(wants, gots):
|
|
fraction = w.group("fraction") # type: Optional[str]
|
|
exponent = w.group("exponent1") # type: Optional[str]
|
|
if exponent is None:
|
|
exponent = w.group("exponent2")
|
|
if fraction is None:
|
|
precision = 0
|
|
else:
|
|
precision = len(fraction)
|
|
if exponent is not None:
|
|
precision -= int(exponent)
|
|
if float(w.group()) == approx(float(g.group()), abs=10 ** -precision):
|
|
# They're close enough. Replace the text we actually
|
|
# got with the text we want, so that it will match when we
|
|
# check the string literally.
|
|
got = (
|
|
got[: g.start() + offset] + w.group() + got[g.end() + offset :]
|
|
)
|
|
offset += w.end() - w.start() - (g.end() - g.start())
|
|
return got
|
|
|
|
return LiteralsOutputChecker
|
|
|
|
|
|
def _get_checker() -> "doctest.OutputChecker":
|
|
"""Return a doctest.OutputChecker subclass that supports some
|
|
additional options:
|
|
|
|
* ALLOW_UNICODE and ALLOW_BYTES options to ignore u'' and b''
|
|
prefixes (respectively) in string literals. Useful when the same
|
|
doctest should run in Python 2 and Python 3.
|
|
|
|
* NUMBER to ignore floating-point differences smaller than the
|
|
precision of the literal number in the doctest.
|
|
|
|
An inner class is used to avoid importing "doctest" at the module
|
|
level.
|
|
"""
|
|
global CHECKER_CLASS
|
|
if CHECKER_CLASS is None:
|
|
CHECKER_CLASS = _init_checker_class()
|
|
return CHECKER_CLASS()
|
|
|
|
|
|
def _get_allow_unicode_flag() -> int:
|
|
"""Register and return the ALLOW_UNICODE flag."""
|
|
import doctest
|
|
|
|
return doctest.register_optionflag("ALLOW_UNICODE")
|
|
|
|
|
|
def _get_allow_bytes_flag() -> int:
|
|
"""Register and return the ALLOW_BYTES flag."""
|
|
import doctest
|
|
|
|
return doctest.register_optionflag("ALLOW_BYTES")
|
|
|
|
|
|
def _get_number_flag() -> int:
|
|
"""Register and return the NUMBER flag."""
|
|
import doctest
|
|
|
|
return doctest.register_optionflag("NUMBER")
|
|
|
|
|
|
def _get_report_choice(key: str) -> int:
|
|
"""Return the actual `doctest` module flag value.
|
|
|
|
We want to do it as late as possible to avoid importing `doctest` and all
|
|
its dependencies when parsing options, as it adds overhead and breaks tests.
|
|
"""
|
|
import doctest
|
|
|
|
return {
|
|
DOCTEST_REPORT_CHOICE_UDIFF: doctest.REPORT_UDIFF,
|
|
DOCTEST_REPORT_CHOICE_CDIFF: doctest.REPORT_CDIFF,
|
|
DOCTEST_REPORT_CHOICE_NDIFF: doctest.REPORT_NDIFF,
|
|
DOCTEST_REPORT_CHOICE_ONLY_FIRST_FAILURE: doctest.REPORT_ONLY_FIRST_FAILURE,
|
|
DOCTEST_REPORT_CHOICE_NONE: 0,
|
|
}[key]
|
|
|
|
|
|
@pytest.fixture(scope="session")
|
|
def doctest_namespace() -> Dict[str, Any]:
|
|
"""Fixture that returns a :py:class:`dict` that will be injected into the
|
|
namespace of doctests."""
|
|
return dict()
|