"""Discover and run doctests in modules and test files."""
import bdb
import inspect
import platform
import sys
import traceback
import types
import warnings
from contextlib import contextmanager
from typing import Any
from typing import Callable
from typing import Dict
from typing import Generator
from typing import Iterable
from typing import List
from typing import Optional
from typing import Pattern
from typing import Sequence
from typing import Tuple
from typing import Type
from typing import TYPE_CHECKING
from typing import Union
import py.path
import pytest
from _pytest import outcomes
from _pytest._code.code import ExceptionInfo
from _pytest._code.code import ReprFileLocation
from _pytest._code.code import TerminalRepr
from _pytest._io import TerminalWriter
from _pytest.compat import safe_getattr
from _pytest.config import Config
from _pytest.config.argparsing import Parser
from _pytest.fixtures import FixtureRequest
from _pytest.nodes import Collector
from _pytest.outcomes import OutcomeException
from _pytest.pathlib import import_path
from _pytest.python_api import approx
from _pytest.warning_types import PytestWarning
if TYPE_CHECKING:
import doctest
DOCTEST_REPORT_CHOICE_NONE = "none"
DOCTEST_REPORT_CHOICE_CDIFF = "cdiff"
DOCTEST_REPORT_CHOICE_NDIFF = "ndiff"
DOCTEST_REPORT_CHOICE_UDIFF = "udiff"
DOCTEST_REPORT_CHOICE_ONLY_FIRST_FAILURE = "only_first_failure"
DOCTEST_REPORT_CHOICES = (
DOCTEST_REPORT_CHOICE_NONE,
DOCTEST_REPORT_CHOICE_CDIFF,
DOCTEST_REPORT_CHOICE_NDIFF,
DOCTEST_REPORT_CHOICE_UDIFF,
DOCTEST_REPORT_CHOICE_ONLY_FIRST_FAILURE,
)
# Lazy definition of runner class
RUNNER_CLASS = None
# Lazy definition of output checker class
CHECKER_CLASS: Optional[Type["doctest.OutputChecker"]] = None
def pytest_addoption(parser: Parser) -> None:
parser.addini(
"doctest_optionflags",
"option flags for doctests",
type="args",
default=["ELLIPSIS"],
)
parser.addini(
"doctest_encoding", "encoding used for doctest files", default="utf-8"
)
group = parser.getgroup("collect")
group.addoption(
"--doctest-modules",
action="store_true",
default=False,
help="run doctests in all .py modules",
dest="doctestmodules",
)
group.addoption(
"--doctest-report",
type=str.lower,
default="udiff",
help="choose another output format for diffs on doctest failure",
choices=DOCTEST_REPORT_CHOICES,
dest="doctestreport",
)
group.addoption(
"--doctest-glob",
action="append",
default=[],
metavar="pat",
help="doctests file matching pattern, default: test*.txt",
dest="doctestglob",
)
group.addoption(
"--doctest-ignore-import-errors",
action="store_true",
default=False,
help="ignore doctest ImportErrors",
dest="doctest_ignore_import_errors",
)
group.addoption(
"--doctest-continue-on-failure",
action="store_true",
default=False,
help="for a given doctest, continue to run after the first failure",
dest="doctest_continue_on_failure",
)
def pytest_unconfigure() -> None:
global RUNNER_CLASS
RUNNER_CLASS = None
def pytest_collect_file(
path: py.path.local, parent: Collector,
) -> Optional[Union["DoctestModule", "DoctestTextfile"]]:
config = parent.config
if path.ext == ".py":
if config.option.doctestmodules and not _is_setup_py(path):
mod: DoctestModule = DoctestModule.from_parent(parent, fspath=path)
return mod
elif _is_doctest(config, path, parent):
txt: DoctestTextfile = DoctestTextfile.from_parent(parent, fspath=path)
return txt
return None
def _is_setup_py(path: py.path.local) -> bool:
if path.basename != "setup.py":
return False
contents = path.read_binary()
return b"setuptools" in contents or b"distutils" in contents
def _is_doctest(config: Config, path: py.path.local, parent) -> bool:
if path.ext in (".txt", ".rst") and parent.session.isinitpath(path):
return True
globs = config.getoption("doctestglob") or ["test*.txt"]
for glob in globs:
if path.check(fnmatch=glob):
return True
return False
class ReprFailDoctest(TerminalRepr):
def __init__(
self, reprlocation_lines: Sequence[Tuple[ReprFileLocation, Sequence[str]]]
) -> None:
self.reprlocation_lines = reprlocation_lines
def toterminal(self, tw: TerminalWriter) -> None:
for reprlocation, lines in self.reprlocation_lines:
for line in lines:
tw.line(line)
reprlocation.toterminal(tw)
class MultipleDoctestFailures(Exception):
def __init__(self, failures: Sequence["doctest.DocTestFailure"]) -> None:
super().__init__()
self.failures = failures
def _init_runner_class() -> Type["doctest.DocTestRunner"]:
import doctest
class PytestDoctestRunner(doctest.DebugRunner):
"""Runner to collect failures.
Note that the out variable in this case is a list instead of a
stdout-like object.
"""
def __init__(
self,
checker: Optional["doctest.OutputChecker"] = None,
verbose: Optional[bool] = None,
optionflags: int = 0,
continue_on_failure: bool = True,
) -> None:
doctest.DebugRunner.__init__(
self, checker=checker, verbose=verbose, optionflags=optionflags
)
self.continue_on_failure = continue_on_failure
def report_failure(
self, out, test: "doctest.DocTest", example: "doctest.Example", got: str,
) -> None:
failure = doctest.DocTestFailure(test, example, got)
if self.continue_on_failure:
out.append(failure)
else:
raise failure
def report_unexpected_exception(
self,
out,
test: "doctest.DocTest",
example: "doctest.Example",
exc_info: Tuple[Type[BaseException], BaseException, types.TracebackType],
) -> None:
if isinstance(exc_info[1], OutcomeException):
raise exc_info[1]
if isinstance(exc_info[1], bdb.BdbQuit):
outcomes.exit("Quitting debugger")
failure = doctest.UnexpectedException(test, example, exc_info)
if self.continue_on_failure:
out.append(failure)
else:
raise failure
return PytestDoctestRunner
def _get_runner(
checker: Optional["doctest.OutputChecker"] = None,
verbose: Optional[bool] = None,
optionflags: int = 0,
continue_on_failure: bool = True,
) -> "doctest.DocTestRunner":
# We need this in order to do a lazy import on doctest
global RUNNER_CLASS
if RUNNER_CLASS is None:
RUNNER_CLASS = _init_runner_class()
# Type ignored because the continue_on_failure argument is only defined on
# PytestDoctestRunner, which is lazily defined so can't be used as a type.
return RUNNER_CLASS( # type: ignore
checker=checker,
verbose=verbose,
optionflags=optionflags,
continue_on_failure=continue_on_failure,
)
class DoctestItem(pytest.Item):
def __init__(
self,
name: str,
parent: "Union[DoctestTextfile, DoctestModule]",
runner: Optional["doctest.DocTestRunner"] = None,
dtest: Optional["doctest.DocTest"] = None,
) -> None:
super().__init__(name, parent)
self.runner = runner
self.dtest = dtest
self.obj = None
self.fixture_request: Optional[FixtureRequest] = None
@classmethod
def from_parent( # type: ignore
cls,
parent: "Union[DoctestTextfile, DoctestModule]",
*,
name: str,
runner: "doctest.DocTestRunner",
dtest: "doctest.DocTest",
):
# incompatible signature due to to imposed limits on sublcass
"""The public named constructor."""
return super().from_parent(name=name, parent=parent, runner=runner, dtest=dtest)
def setup(self) -> None:
if self.dtest is not None:
self.fixture_request = _setup_fixtures(self)
globs = dict(getfixture=self.fixture_request.getfixturevalue)
for name, value in self.fixture_request.getfixturevalue(
"doctest_namespace"
).items():
globs[name] = value
self.dtest.globs.update(globs)
def runtest(self) -> None:
assert self.dtest is not None
assert self.runner is not None
_check_all_skipped(self.dtest)
self._disable_output_capturing_for_darwin()
failures: List["doctest.DocTestFailure"] = []
# Type ignored because we change the type of `out` from what
# doctest expects.
self.runner.run(self.dtest, out=failures) # type: ignore[arg-type]
if failures:
raise MultipleDoctestFailures(failures)
def _disable_output_capturing_for_darwin(self) -> None:
"""Disable output capturing. Otherwise, stdout is lost to doctest (#985)."""
if platform.system() != "Darwin":
return
capman = self.config.pluginmanager.getplugin("capturemanager")
if capman:
capman.suspend_global_capture(in_=True)
out, err = capman.read_global_capture()
sys.stdout.write(out)
sys.stderr.write(err)
# TODO: Type ignored -- breaks Liskov Substitution.
def repr_failure( # type: ignore[override]
self, excinfo: ExceptionInfo[BaseException],
) -> Union[str, TerminalRepr]:
import doctest
failures: Optional[
Sequence[Union[doctest.DocTestFailure, doctest.UnexpectedException]]
] = (None)
if isinstance(
excinfo.value, (doctest.DocTestFailure, doctest.UnexpectedException)
):
failures = [excinfo.value]
elif isinstance(excinfo.value, MultipleDoctestFailures):
failures = excinfo.value.failures
if failures is not None:
reprlocation_lines = []
for failure in failures:
example = failure.example
test = failure.test
filename = test.filename
if test.lineno is None:
lineno = None
else:
lineno = test.lineno + example.lineno + 1
message = type(failure).__name__
# TODO: ReprFileLocation doesn't expect a None lineno.
reprlocation = ReprFileLocation(filename, lineno, message) # type: ignore[arg-type]
checker = _get_checker()
report_choice = _get_report_choice(
self.config.getoption("doctestreport")
)
if lineno is not None:
assert failure.test.docstring is not None
lines = failure.test.docstring.splitlines(False)
# add line numbers to the left of the error message
assert test.lineno is not None
lines = [
"%03d %s" % (i + test.lineno + 1, x)
for (i, x) in enumerate(lines)
]
# trim docstring error lines to 10
lines = lines[max(example.lineno - 9, 0) : example.lineno + 1]
else:
lines = [
"EXAMPLE LOCATION UNKNOWN, not showing all tests of that example"
]
indent = ">>>"
for line in example.source.splitlines():
lines.append(f"??? {indent} {line}")
indent = "..."
if isinstance(failure, doctest.DocTestFailure):
lines += checker.output_difference(
example, failure.got, report_choice
).split("\n")
else:
inner_excinfo = ExceptionInfo(failure.exc_info)
lines += ["UNEXPECTED EXCEPTION: %s" % repr(inner_excinfo.value)]
lines += [
x.strip("\n")
for x in traceback.format_exception(*failure.exc_info)
]
reprlocation_lines.append((reprlocation, lines))
return ReprFailDoctest(reprlocation_lines)
else:
return super().repr_failure(excinfo)
def reportinfo(self):
assert self.dtest is not None
return self.fspath, self.dtest.lineno, "[doctest] %s" % self.name
def _get_flag_lookup() -> Dict[str, int]:
import doctest
return dict(
DONT_ACCEPT_TRUE_FOR_1=doctest.DONT_ACCEPT_TRUE_FOR_1,
DONT_ACCEPT_BLANKLINE=doctest.DONT_ACCEPT_BLANKLINE,
NORMALIZE_WHITESPACE=doctest.NORMALIZE_WHITESPACE,
ELLIPSIS=doctest.ELLIPSIS,
IGNORE_EXCEPTION_DETAIL=doctest.IGNORE_EXCEPTION_DETAIL,
COMPARISON_FLAGS=doctest.COMPARISON_FLAGS,
ALLOW_UNICODE=_get_allow_unicode_flag(),
ALLOW_BYTES=_get_allow_bytes_flag(),
NUMBER=_get_number_flag(),
)
def get_optionflags(parent):
optionflags_str = parent.config.getini("doctest_optionflags")
flag_lookup_table = _get_flag_lookup()
flag_acc = 0
for flag in optionflags_str:
flag_acc |= flag_lookup_table[flag]
return flag_acc
def _get_continue_on_failure(config):
continue_on_failure = config.getvalue("doctest_continue_on_failure")
if continue_on_failure:
# We need to turn off this if we use pdb since we should stop at
# the first failure.
if config.getvalue("usepdb"):
continue_on_failure = False
return continue_on_failure
class DoctestTextfile(pytest.Module):
obj = None
def collect(self) -> Iterable[DoctestItem]:
import doctest
# Inspired by doctest.testfile; ideally we would use it directly,
# but it doesn't support passing a custom checker.
encoding = self.config.getini("doctest_encoding")
text = self.fspath.read_text(encoding)
filename = str(self.fspath)
name = self.fspath.basename
globs = {"__name__": "__main__"}
optionflags = get_optionflags(self)
runner = _get_runner(
verbose=False,
optionflags=optionflags,
checker=_get_checker(),
continue_on_failure=_get_continue_on_failure(self.config),
)
parser = doctest.DocTestParser()
test = parser.get_doctest(text, globs, name, filename, 0)
if test.examples:
yield DoctestItem.from_parent(
self, name=test.name, runner=runner, dtest=test
)
def _check_all_skipped(test: "doctest.DocTest") -> None:
"""Raise pytest.skip() if all examples in the given DocTest have the SKIP
option set."""
import doctest
all_skipped = all(x.options.get(doctest.SKIP, False) for x in test.examples)
if all_skipped:
pytest.skip("all tests skipped by +SKIP option")
def _is_mocked(obj: object) -> bool:
"""Return if an object is possibly a mock object by checking the
existence of a highly improbable attribute."""
return (
safe_getattr(obj, "pytest_mock_example_attribute_that_shouldnt_exist", None)
is not None
)
@contextmanager
def _patch_unwrap_mock_aware() -> Generator[None, None, None]:
"""Context manager which replaces ``inspect.unwrap`` with a version
that's aware of mock objects and doesn't recurse into them."""
real_unwrap = inspect.unwrap
def _mock_aware_unwrap(
func: Callable[..., Any], *, stop: Optional[Callable[[Any], Any]] = None
) -> Any:
try:
if stop is None or stop is _is_mocked:
return real_unwrap(func, stop=_is_mocked)
_stop = stop
return real_unwrap(func, stop=lambda obj: _is_mocked(obj) or _stop(func))
except Exception as e:
warnings.warn(
"Got %r when unwrapping %r. This is usually caused "
"by a violation of Python's object protocol; see e.g. "
"https://github.com/pytest-dev/pytest/issues/5080" % (e, func),
PytestWarning,
)
raise
inspect.unwrap = _mock_aware_unwrap
try:
yield
finally:
inspect.unwrap = real_unwrap
class DoctestModule(pytest.Module):
def collect(self) -> Iterable[DoctestItem]:
import doctest
class MockAwareDocTestFinder(doctest.DocTestFinder):
"""A hackish doctest finder that overrides stdlib internals to fix a stdlib bug.
https://github.com/pytest-dev/pytest/issues/3456
https://bugs.python.org/issue25532
"""
def _find_lineno(self, obj, source_lines):
"""Doctest code does not take into account `@property`, this
is a hackish way to fix it.
https://bugs.python.org/issue17446
"""
if isinstance(obj, property):
obj = getattr(obj, "fget", obj)
# Type ignored because this is a private function.
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, _ispytest=True)
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: Optional[str] = w.group("fraction")
exponent: Optional[str] = w.group("exponent1")
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]
[docs]@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()
