327 lines
11 KiB
Python
327 lines
11 KiB
Python
""" generic mechanism for marking and selecting python functions. """
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import inspect
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class MarkerError(Exception):
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"""Error in use of a pytest marker/attribute."""
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def pytest_namespace():
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return {'mark': MarkGenerator()}
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def pytest_addoption(parser):
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group = parser.getgroup("general")
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group._addoption(
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'-k',
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action="store", dest="keyword", default='', metavar="EXPRESSION",
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help="only run tests which match the given substring expression. "
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"An expression is a python evaluatable expression "
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"where all names are substring-matched against test names "
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"and their parent classes. Example: -k 'test_method or test_"
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"other' matches all test functions and classes whose name "
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"contains 'test_method' or 'test_other'. "
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"Additionally keywords are matched to classes and functions "
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"containing extra names in their 'extra_keyword_matches' set, "
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"as well as functions which have names assigned directly to them."
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)
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group._addoption(
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"-m",
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action="store", dest="markexpr", default="", metavar="MARKEXPR",
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help="only run tests matching given mark expression. "
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"example: -m 'mark1 and not mark2'."
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)
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group.addoption(
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"--markers", action="store_true",
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help="show markers (builtin, plugin and per-project ones)."
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)
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parser.addini("markers", "markers for test functions", 'linelist')
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def pytest_cmdline_main(config):
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import _pytest.config
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if config.option.markers:
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config._do_configure()
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tw = _pytest.config.create_terminal_writer(config)
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for line in config.getini("markers"):
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name, rest = line.split(":", 1)
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tw.write("@pytest.mark.%s:" % name, bold=True)
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tw.line(rest)
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tw.line()
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config._ensure_unconfigure()
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return 0
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pytest_cmdline_main.tryfirst = True
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def pytest_collection_modifyitems(items, config):
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keywordexpr = config.option.keyword.lstrip()
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matchexpr = config.option.markexpr
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if not keywordexpr and not matchexpr:
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return
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# pytest used to allow "-" for negating
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# but today we just allow "-" at the beginning, use "not" instead
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# we probably remove "-" alltogether soon
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if keywordexpr.startswith("-"):
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keywordexpr = "not " + keywordexpr[1:]
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selectuntil = False
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if keywordexpr[-1:] == ":":
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selectuntil = True
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keywordexpr = keywordexpr[:-1]
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remaining = []
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deselected = []
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for colitem in items:
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if keywordexpr and not matchkeyword(colitem, keywordexpr):
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deselected.append(colitem)
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else:
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if selectuntil:
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keywordexpr = None
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if matchexpr:
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if not matchmark(colitem, matchexpr):
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deselected.append(colitem)
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continue
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remaining.append(colitem)
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if deselected:
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config.hook.pytest_deselected(items=deselected)
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items[:] = remaining
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class MarkMapping:
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"""Provides a local mapping for markers where item access
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resolves to True if the marker is present. """
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def __init__(self, keywords):
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mymarks = set()
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for key, value in keywords.items():
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if isinstance(value, MarkInfo) or isinstance(value, MarkDecorator):
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mymarks.add(key)
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self._mymarks = mymarks
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def __getitem__(self, name):
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return name in self._mymarks
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class KeywordMapping:
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"""Provides a local mapping for keywords.
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Given a list of names, map any substring of one of these names to True.
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"""
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def __init__(self, names):
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self._names = names
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def __getitem__(self, subname):
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for name in self._names:
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if subname in name:
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return True
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return False
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def matchmark(colitem, markexpr):
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"""Tries to match on any marker names, attached to the given colitem."""
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return eval(markexpr, {}, MarkMapping(colitem.keywords))
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def matchkeyword(colitem, keywordexpr):
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"""Tries to match given keyword expression to given collector item.
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Will match on the name of colitem, including the names of its parents.
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Only matches names of items which are either a :class:`Class` or a
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:class:`Function`.
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Additionally, matches on names in the 'extra_keyword_matches' set of
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any item, as well as names directly assigned to test functions.
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"""
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mapped_names = set()
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# Add the names of the current item and any parent items
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import pytest
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for item in colitem.listchain():
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if not isinstance(item, pytest.Instance):
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mapped_names.add(item.name)
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# Add the names added as extra keywords to current or parent items
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for name in colitem.listextrakeywords():
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mapped_names.add(name)
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# Add the names attached to the current function through direct assignment
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if hasattr(colitem, 'function'):
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for name in colitem.function.__dict__:
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mapped_names.add(name)
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mapping = KeywordMapping(mapped_names)
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if " " not in keywordexpr:
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# special case to allow for simple "-k pass" and "-k 1.3"
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return mapping[keywordexpr]
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elif keywordexpr.startswith("not ") and " " not in keywordexpr[4:]:
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return not mapping[keywordexpr[4:]]
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return eval(keywordexpr, {}, mapping)
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def pytest_configure(config):
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import pytest
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if config.option.strict:
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pytest.mark._config = config
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class MarkGenerator:
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""" Factory for :class:`MarkDecorator` objects - exposed as
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a ``pytest.mark`` singleton instance. Example::
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import pytest
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@pytest.mark.slowtest
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def test_function():
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pass
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will set a 'slowtest' :class:`MarkInfo` object
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on the ``test_function`` object. """
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def __getattr__(self, name):
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if name[0] == "_":
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raise AttributeError("Marker name must NOT start with underscore")
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if hasattr(self, '_config'):
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self._check(name)
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return MarkDecorator(name)
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def _check(self, name):
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try:
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if name in self._markers:
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return
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except AttributeError:
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pass
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self._markers = l = set()
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for line in self._config.getini("markers"):
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beginning = line.split(":", 1)
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x = beginning[0].split("(", 1)[0]
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l.add(x)
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if name not in self._markers:
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raise AttributeError("%r not a registered marker" % (name,))
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def istestfunc(func):
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return hasattr(func, "__call__") and \
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getattr(func, "__name__", "<lambda>") != "<lambda>"
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class MarkDecorator:
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""" A decorator for test functions and test classes. When applied
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it will create :class:`MarkInfo` objects which may be
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:ref:`retrieved by hooks as item keywords <excontrolskip>`.
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MarkDecorator instances are often created like this::
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mark1 = pytest.mark.NAME # simple MarkDecorator
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mark2 = pytest.mark.NAME(name1=value) # parametrized MarkDecorator
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and can then be applied as decorators to test functions::
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@mark2
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def test_function():
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pass
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When a MarkDecorator instance is called it does the following:
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1. If called with a single class as its only positional argument and no
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additional keyword arguments, it attaches itself to the class so it
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gets applied automatically to all test cases found in that class.
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2. If called with a single function as its only positional argument and
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no additional keyword arguments, it attaches a MarkInfo object to the
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function, containing all the arguments already stored internally in
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the MarkDecorator.
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3. When called in any other case, it performs a 'fake construction' call,
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i.e. it returns a new MarkDecorator instance with the original
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MarkDecorator's content updated with the arguments passed to this
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call.
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Note: The rules above prevent MarkDecorator objects from storing only a
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single function or class reference as their positional argument with no
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additional keyword or positional arguments.
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"""
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def __init__(self, name, args=None, kwargs=None):
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self.name = name
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self.args = args or ()
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self.kwargs = kwargs or {}
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@property
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def markname(self):
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return self.name # for backward-compat (2.4.1 had this attr)
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def __repr__(self):
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d = self.__dict__.copy()
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name = d.pop('name')
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return "<MarkDecorator %r %r>" % (name, d)
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def __call__(self, *args, **kwargs):
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""" if passed a single callable argument: decorate it with mark info.
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otherwise add *args/**kwargs in-place to mark information. """
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if args and not kwargs:
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func = args[0]
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is_class = inspect.isclass(func)
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if len(args) == 1 and (istestfunc(func) or is_class):
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if is_class:
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if hasattr(func, 'pytestmark'):
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mark_list = func.pytestmark
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if not isinstance(mark_list, list):
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mark_list = [mark_list]
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# always work on a copy to avoid updating pytestmark
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# from a superclass by accident
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mark_list = mark_list + [self]
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func.pytestmark = mark_list
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else:
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func.pytestmark = [self]
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else:
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holder = getattr(func, self.name, None)
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if holder is None:
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holder = MarkInfo(
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self.name, self.args, self.kwargs
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)
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setattr(func, self.name, holder)
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else:
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holder.add(self.args, self.kwargs)
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return func
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kw = self.kwargs.copy()
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kw.update(kwargs)
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args = self.args + args
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return self.__class__(self.name, args=args, kwargs=kw)
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def extract_argvalue(maybe_marked_args):
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# TODO: incorrect mark data, the old code wanst able to collect lists
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# individual parametrized argument sets can be wrapped in a series
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# of markers in which case we unwrap the values and apply the mark
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# at Function init
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newmarks = {}
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argval = maybe_marked_args
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while isinstance(argval, MarkDecorator):
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newmark = MarkDecorator(argval.markname,
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argval.args[:-1], argval.kwargs)
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newmarks[newmark.markname] = newmark
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argval = argval.args[-1]
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return argval, newmarks
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class MarkInfo:
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""" Marking object created by :class:`MarkDecorator` instances. """
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def __init__(self, name, args, kwargs):
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#: name of attribute
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self.name = name
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#: positional argument list, empty if none specified
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self.args = args
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#: keyword argument dictionary, empty if nothing specified
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self.kwargs = kwargs.copy()
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self._arglist = [(args, kwargs.copy())]
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def __repr__(self):
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return "<MarkInfo %r args=%r kwargs=%r>" % (
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self.name, self.args, self.kwargs
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)
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def add(self, args, kwargs):
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""" add a MarkInfo with the given args and kwargs. """
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self._arglist.append((args, kwargs))
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self.args += args
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self.kwargs.update(kwargs)
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def __iter__(self):
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""" yield MarkInfo objects each relating to a marking-call. """
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for args, kwargs in self._arglist:
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yield MarkInfo(self.name, args, kwargs)
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