Source code for _pytest.python

""" Python test discovery, setup and run of test functions. """
import fnmatch
import functools
import inspect
import re
import types
import sys

import py
import pytest
from _pytest._code.code import TerminalRepr
from _pytest.mark import MarkDecorator, MarkerError

try:
    import enum
except ImportError:  # pragma: no cover
    # Only available in Python 3.4+ or as a backport
    enum = None

import _pytest
import _pytest._pluggy as pluggy

cutdir2 = py.path.local(_pytest.__file__).dirpath()
cutdir1 = py.path.local(pluggy.__file__.rstrip("oc"))


NoneType = type(None)
NOTSET = object()
isfunction = inspect.isfunction
isclass = inspect.isclass
callable = py.builtin.callable
# used to work around a python2 exception info leak
exc_clear = getattr(sys, 'exc_clear', lambda: None)
# The type of re.compile objects is not exposed in Python.
REGEX_TYPE = type(re.compile(''))

_PY3 = sys.version_info > (3, 0)
_PY2 = not _PY3


if hasattr(inspect, 'signature'):
    def _format_args(func):
        return str(inspect.signature(func))
else:
    def _format_args(func):
        return inspect.formatargspec(*inspect.getargspec(func))

if  sys.version_info[:2] == (2, 6):
    def isclass(object):
        """ Return true if the object is a class. Overrides inspect.isclass for
        python 2.6 because it will return True for objects which always return
        something on __getattr__ calls (see #1035).
        Backport of https://hg.python.org/cpython/rev/35bf8f7a8edc
        """
        return isinstance(object, (type, types.ClassType))

def _has_positional_arg(func):
    return func.__code__.co_argcount


def filter_traceback(entry):
    # entry.path might sometimes return a str object when the entry
    # points to dynamically generated code
    # see https://bitbucket.org/pytest-dev/py/issues/71
    raw_filename = entry.frame.code.raw.co_filename
    is_generated = '<' in raw_filename and '>' in raw_filename
    if is_generated:
        return False
    # entry.path might point to an inexisting file, in which case it will
    # alsso return a str object. see #1133
    p = py.path.local(entry.path)
    return p != cutdir1 and not p.relto(cutdir2)


def get_real_func(obj):
    """ gets the real function object of the (possibly) wrapped object by
    functools.wraps or functools.partial.
    """
    while hasattr(obj, "__wrapped__"):
        obj = obj.__wrapped__
    if isinstance(obj, functools.partial):
        obj = obj.func
    return obj

def getfslineno(obj):
    # xxx let decorators etc specify a sane ordering
    obj = get_real_func(obj)
    if hasattr(obj, 'place_as'):
        obj = obj.place_as
    fslineno = _pytest._code.getfslineno(obj)
    assert isinstance(fslineno[1], int), obj
    return fslineno

def getimfunc(func):
    try:
        return func.__func__
    except AttributeError:
        try:
            return func.im_func
        except AttributeError:
            return func

def safe_getattr(object, name, default):
    """ Like getattr but return default upon any Exception.

    Attribute access can potentially fail for 'evil' Python objects.
    See issue214
    """
    try:
        return getattr(object, name, default)
    except Exception:
        return default


class FixtureFunctionMarker:
    def __init__(self, scope, params,
                 autouse=False, yieldctx=False, ids=None):
        self.scope = scope
        self.params = params
        self.autouse = autouse
        self.yieldctx = yieldctx
        self.ids = ids

    def __call__(self, function):
        if isclass(function):
            raise ValueError(
                    "class fixtures not supported (may be in the future)")
        function._pytestfixturefunction = self
        return function


[docs]def fixture(scope="function", params=None, autouse=False, ids=None): """ (return a) decorator to mark a fixture factory function. This decorator can be used (with or or without parameters) to define a fixture function. The name of the fixture function can later be referenced to cause its invocation ahead of running tests: test modules or classes can use the pytest.mark.usefixtures(fixturename) marker. Test functions can directly use fixture names as input arguments in which case the fixture instance returned from the fixture function will be injected. :arg scope: the scope for which this fixture is shared, one of "function" (default), "class", "module", "session". :arg params: an optional list of parameters which will cause multiple invocations of the fixture function and all of the tests using it. :arg autouse: if True, the fixture func is activated for all tests that can see it. If False (the default) then an explicit reference is needed to activate the fixture. :arg ids: list of string ids each corresponding to the params so that they are part of the test id. If no ids are provided they will be generated automatically from the params. """ if callable(scope) and params is None and autouse == False: # direct decoration return FixtureFunctionMarker( "function", params, autouse)(scope) if params is not None and not isinstance(params, (list, tuple)): params = list(params) return FixtureFunctionMarker(scope, params, autouse, ids=ids)
def yield_fixture(scope="function", params=None, autouse=False, ids=None): """ (return a) decorator to mark a yield-fixture factory function (EXPERIMENTAL). This takes the same arguments as :py:func:`pytest.fixture` but expects a fixture function to use a ``yield`` instead of a ``return`` statement to provide a fixture. See http://pytest.org/en/latest/yieldfixture.html for more info. """ if callable(scope) and params is None and autouse == False: # direct decoration return FixtureFunctionMarker( "function", params, autouse, yieldctx=True)(scope) else: return FixtureFunctionMarker(scope, params, autouse, yieldctx=True, ids=ids) defaultfuncargprefixmarker = fixture() def pyobj_property(name): def get(self): node = self.getparent(getattr(pytest, name)) if node is not None: return node.obj doc = "python %s object this node was collected from (can be None)." % ( name.lower(),) return property(get, None, None, doc) def pytest_addoption(parser): group = parser.getgroup("general") group.addoption('--fixtures', '--funcargs', action="store_true", dest="showfixtures", default=False, help="show available fixtures, sorted by plugin appearance") parser.addini("usefixtures", type="args", default=[], help="list of default fixtures to be used with this project") parser.addini("python_files", type="args", default=['test_*.py', '*_test.py'], help="glob-style file patterns for Python test module discovery") parser.addini("python_classes", type="args", default=["Test",], help="prefixes or glob names for Python test class discovery") parser.addini("python_functions", type="args", default=["test",], help="prefixes or glob names for Python test function and " "method discovery") group.addoption("--import-mode", default="prepend", choices=["prepend", "append"], dest="importmode", help="prepend/append to sys.path when importing test modules, " "default is to prepend.") def pytest_cmdline_main(config): if config.option.showfixtures: showfixtures(config) return 0 def pytest_generate_tests(metafunc): # those alternative spellings are common - raise a specific error to alert # the user alt_spellings = ['parameterize', 'parametrise', 'parameterise'] for attr in alt_spellings: if hasattr(metafunc.function, attr): msg = "{0} has '{1}', spelling should be 'parametrize'" raise MarkerError(msg.format(metafunc.function.__name__, attr)) try: markers = metafunc.function.parametrize except AttributeError: return for marker in markers: metafunc.parametrize(*marker.args, **marker.kwargs) def pytest_configure(config): config.addinivalue_line("markers", "parametrize(argnames, argvalues): call a test function multiple " "times passing in different arguments in turn. argvalues generally " "needs to be a list of values if argnames specifies only one name " "or a list of tuples of values if argnames specifies multiple names. " "Example: @parametrize('arg1', [1,2]) would lead to two calls of the " "decorated test function, one with arg1=1 and another with arg1=2." "see http://pytest.org/latest/parametrize.html for more info and " "examples." ) config.addinivalue_line("markers", "usefixtures(fixturename1, fixturename2, ...): mark tests as needing " "all of the specified fixtures. see http://pytest.org/latest/fixture.html#usefixtures " ) def pytest_sessionstart(session): session._fixturemanager = FixtureManager(session) @pytest.hookimpl(trylast=True) def pytest_namespace(): raises.Exception = pytest.fail.Exception return { 'fixture': fixture, 'yield_fixture': yield_fixture, 'raises' : raises, 'collect': { 'Module': Module, 'Class': Class, 'Instance': Instance, 'Function': Function, 'Generator': Generator, '_fillfuncargs': fillfixtures} } @fixture(scope="session") def pytestconfig(request): """ the pytest config object with access to command line opts.""" return request.config @pytest.hookimpl(trylast=True) def pytest_pyfunc_call(pyfuncitem): testfunction = pyfuncitem.obj if pyfuncitem._isyieldedfunction(): testfunction(*pyfuncitem._args) else: funcargs = pyfuncitem.funcargs testargs = {} for arg in pyfuncitem._fixtureinfo.argnames: testargs[arg] = funcargs[arg] testfunction(**testargs) return True def pytest_collect_file(path, parent): ext = path.ext if ext == ".py": if not parent.session.isinitpath(path): for pat in parent.config.getini('python_files'): if path.fnmatch(pat): break else: return ihook = parent.session.gethookproxy(path) return ihook.pytest_pycollect_makemodule(path=path, parent=parent) def pytest_pycollect_makemodule(path, parent): return Module(path, parent) @pytest.hookimpl(hookwrapper=True) def pytest_pycollect_makeitem(collector, name, obj): outcome = yield res = outcome.get_result() if res is not None: raise StopIteration # nothing was collected elsewhere, let's do it here if isclass(obj): if collector.istestclass(obj, name): Class = collector._getcustomclass("Class") outcome.force_result(Class(name, parent=collector)) elif collector.istestfunction(obj, name): # mock seems to store unbound methods (issue473), normalize it obj = getattr(obj, "__func__", obj) # We need to try and unwrap the function if it's a functools.partial # or a funtools.wrapped. # We musn't if it's been wrapped with mock.patch (python 2 only) if not (isfunction(obj) or isfunction(get_real_func(obj))): collector.warn(code="C2", message= "cannot collect %r because it is not a function." % name, ) elif getattr(obj, "__test__", True): if is_generator(obj): res = Generator(name, parent=collector) else: res = list(collector._genfunctions(name, obj)) outcome.force_result(res) def is_generator(func): try: return _pytest._code.getrawcode(func).co_flags & 32 # generator function except AttributeError: # builtin functions have no bytecode # assume them to not be generators return False class PyobjContext(object): module = pyobj_property("Module") cls = pyobj_property("Class") instance = pyobj_property("Instance") class PyobjMixin(PyobjContext): def obj(): def fget(self): try: return self._obj except AttributeError: self._obj = obj = self._getobj() return obj def fset(self, value): self._obj = value return property(fget, fset, None, "underlying python object") obj = obj() def _getobj(self): return getattr(self.parent.obj, self.name) def getmodpath(self, stopatmodule=True, includemodule=False): """ return python path relative to the containing module. """ chain = self.listchain() chain.reverse() parts = [] for node in chain: if isinstance(node, Instance): continue name = node.name if isinstance(node, Module): assert name.endswith(".py") name = name[:-3] if stopatmodule: if includemodule: parts.append(name) break parts.append(name) parts.reverse() s = ".".join(parts) return s.replace(".[", "[") def _getfslineno(self): return getfslineno(self.obj) def reportinfo(self): # XXX caching? obj = self.obj compat_co_firstlineno = getattr(obj, 'compat_co_firstlineno', None) if isinstance(compat_co_firstlineno, int): # nose compatibility fspath = sys.modules[obj.__module__].__file__ if fspath.endswith(".pyc"): fspath = fspath[:-1] lineno = compat_co_firstlineno else: fspath, lineno = getfslineno(obj) modpath = self.getmodpath() assert isinstance(lineno, int) return fspath, lineno, modpath class PyCollector(PyobjMixin, pytest.Collector): def funcnamefilter(self, name): return self._matches_prefix_or_glob_option('python_functions', name) def isnosetest(self, obj): """ Look for the __test__ attribute, which is applied by the @nose.tools.istest decorator """ # We explicitly check for "is True" here to not mistakenly treat # classes with a custom __getattr__ returning something truthy (like a # function) as test classes. return safe_getattr(obj, '__test__', False) is True def classnamefilter(self, name): return self._matches_prefix_or_glob_option('python_classes', name) def istestfunction(self, obj, name): return ( (self.funcnamefilter(name) or self.isnosetest(obj)) and safe_getattr(obj, "__call__", False) and getfixturemarker(obj) is None ) def istestclass(self, obj, name): return self.classnamefilter(name) or self.isnosetest(obj) def _matches_prefix_or_glob_option(self, option_name, name): """ checks if the given name matches the prefix or glob-pattern defined in ini configuration. """ for option in self.config.getini(option_name): if name.startswith(option): return True # check that name looks like a glob-string before calling fnmatch # because this is called for every name in each collected module, # and fnmatch is somewhat expensive to call elif ('*' in option or '?' in option or '[' in option) and \ fnmatch.fnmatch(name, option): return True return False def collect(self): if not getattr(self.obj, "__test__", True): return [] # NB. we avoid random getattrs and peek in the __dict__ instead # (XXX originally introduced from a PyPy need, still true?) dicts = [getattr(self.obj, '__dict__', {})] for basecls in inspect.getmro(self.obj.__class__): dicts.append(basecls.__dict__) seen = {} l = [] for dic in dicts: for name, obj in list(dic.items()): if name in seen: continue seen[name] = True res = self.makeitem(name, obj) if res is None: continue if not isinstance(res, list): res = [res] l.extend(res) l.sort(key=lambda item: item.reportinfo()[:2]) return l def makeitem(self, name, obj): #assert self.ihook.fspath == self.fspath, self return self.ihook.pytest_pycollect_makeitem( collector=self, name=name, obj=obj) def _genfunctions(self, name, funcobj): module = self.getparent(Module).obj clscol = self.getparent(Class) cls = clscol and clscol.obj or None transfer_markers(funcobj, cls, module) fm = self.session._fixturemanager fixtureinfo = fm.getfixtureinfo(self, funcobj, cls) metafunc = Metafunc(funcobj, fixtureinfo, self.config, cls=cls, module=module) methods = [] if hasattr(module, "pytest_generate_tests"): methods.append(module.pytest_generate_tests) if hasattr(cls, "pytest_generate_tests"): methods.append(cls().pytest_generate_tests) if methods: self.ihook.pytest_generate_tests.call_extra(methods, dict(metafunc=metafunc)) else: self.ihook.pytest_generate_tests(metafunc=metafunc) Function = self._getcustomclass("Function") if not metafunc._calls: yield Function(name, parent=self, fixtureinfo=fixtureinfo) else: # add funcargs() as fixturedefs to fixtureinfo.arg2fixturedefs add_funcarg_pseudo_fixture_def(self, metafunc, fm) for callspec in metafunc._calls: subname = "%s[%s]" %(name, callspec.id) yield Function(name=subname, parent=self, callspec=callspec, callobj=funcobj, fixtureinfo=fixtureinfo, keywords={callspec.id:True}) def add_funcarg_pseudo_fixture_def(collector, metafunc, fixturemanager): # this function will transform all collected calls to a functions # if they use direct funcargs (i.e. direct parametrization) # because we want later test execution to be able to rely on # an existing FixtureDef structure for all arguments. # XXX we can probably avoid this algorithm if we modify CallSpec2 # to directly care for creating the fixturedefs within its methods. if not metafunc._calls[0].funcargs: return # this function call does not have direct parametrization # collect funcargs of all callspecs into a list of values arg2params = {} arg2scope = {} for callspec in metafunc._calls: for argname, argvalue in callspec.funcargs.items(): assert argname not in callspec.params callspec.params[argname] = argvalue arg2params_list = arg2params.setdefault(argname, []) callspec.indices[argname] = len(arg2params_list) arg2params_list.append(argvalue) if argname not in arg2scope: scopenum = callspec._arg2scopenum.get(argname, scopenum_function) arg2scope[argname] = scopes[scopenum] callspec.funcargs.clear() # register artificial FixtureDef's so that later at test execution # time we can rely on a proper FixtureDef to exist for fixture setup. arg2fixturedefs = metafunc._arg2fixturedefs for argname, valuelist in arg2params.items(): # if we have a scope that is higher than function we need # to make sure we only ever create an according fixturedef on # a per-scope basis. We thus store and cache the fixturedef on the # node related to the scope. scope = arg2scope[argname] node = None if scope != "function": node = get_scope_node(collector, scope) if node is None: assert scope == "class" and isinstance(collector, Module) # use module-level collector for class-scope (for now) node = collector if node and argname in node._name2pseudofixturedef: arg2fixturedefs[argname] = [node._name2pseudofixturedef[argname]] else: fixturedef = FixtureDef(fixturemanager, '', argname, get_direct_param_fixture_func, arg2scope[argname], valuelist, False, False) arg2fixturedefs[argname] = [fixturedef] if node is not None: node._name2pseudofixturedef[argname] = fixturedef def get_direct_param_fixture_func(request): return request.param class FuncFixtureInfo: def __init__(self, argnames, names_closure, name2fixturedefs): self.argnames = argnames self.names_closure = names_closure self.name2fixturedefs = name2fixturedefs def _marked(func, mark): """ Returns True if :func: is already marked with :mark:, False otherwise. This can happen if marker is applied to class and the test file is invoked more than once. """ try: func_mark = getattr(func, mark.name) except AttributeError: return False return mark.args == func_mark.args and mark.kwargs == func_mark.kwargs def transfer_markers(funcobj, cls, mod): # XXX this should rather be code in the mark plugin or the mark # plugin should merge with the python plugin. for holder in (cls, mod): try: pytestmark = holder.pytestmark except AttributeError: continue if isinstance(pytestmark, list): for mark in pytestmark: if not _marked(funcobj, mark): mark(funcobj) else: if not _marked(funcobj, pytestmark): pytestmark(funcobj)
[docs]class Module(pytest.File, PyCollector): """ Collector for test classes and functions. """ def _getobj(self): return self._memoizedcall('_obj', self._importtestmodule) def collect(self): self.session._fixturemanager.parsefactories(self) return super(Module, self).collect() def _importtestmodule(self): # we assume we are only called once per module importmode = self.config.getoption("--import-mode") try: mod = self.fspath.pyimport(ensuresyspath=importmode) except SyntaxError: raise self.CollectError( _pytest._code.ExceptionInfo().getrepr(style="short")) except self.fspath.ImportMismatchError: e = sys.exc_info()[1] raise self.CollectError( "import file mismatch:\n" "imported module %r has this __file__ attribute:\n" " %s\n" "which is not the same as the test file we want to collect:\n" " %s\n" "HINT: remove __pycache__ / .pyc files and/or use a " "unique basename for your test file modules" % e.args ) #print "imported test module", mod self.config.pluginmanager.consider_module(mod) return mod def setup(self): setup_module = xunitsetup(self.obj, "setUpModule") if setup_module is None: setup_module = xunitsetup(self.obj, "setup_module") if setup_module is not None: #XXX: nose compat hack, move to nose plugin # if it takes a positional arg, its probably a pytest style one # so we pass the current module object if _has_positional_arg(setup_module): setup_module(self.obj) else: setup_module() fin = getattr(self.obj, 'tearDownModule', None) if fin is None: fin = getattr(self.obj, 'teardown_module', None) if fin is not None: #XXX: nose compat hack, move to nose plugin # if it takes a positional arg, it's probably a pytest style one # so we pass the current module object if _has_positional_arg(fin): finalizer = lambda: fin(self.obj) else: finalizer = fin self.addfinalizer(finalizer)
[docs]class Class(PyCollector): """ Collector for test methods. """ def collect(self): if hasinit(self.obj): self.warn("C1", "cannot collect test class %r because it has a " "__init__ constructor" % self.obj.__name__) return [] return [self._getcustomclass("Instance")(name="()", parent=self)] def setup(self): setup_class = xunitsetup(self.obj, 'setup_class') if setup_class is not None: setup_class = getattr(setup_class, 'im_func', setup_class) setup_class = getattr(setup_class, '__func__', setup_class) setup_class(self.obj) fin_class = getattr(self.obj, 'teardown_class', None) if fin_class is not None: fin_class = getattr(fin_class, 'im_func', fin_class) fin_class = getattr(fin_class, '__func__', fin_class) self.addfinalizer(lambda: fin_class(self.obj))
class Instance(PyCollector): def _getobj(self): obj = self.parent.obj() return obj def collect(self): self.session._fixturemanager.parsefactories(self) return super(Instance, self).collect() def newinstance(self): self.obj = self._getobj() return self.obj class FunctionMixin(PyobjMixin): """ mixin for the code common to Function and Generator. """ def setup(self): """ perform setup for this test function. """ if hasattr(self, '_preservedparent'): obj = self._preservedparent elif isinstance(self.parent, Instance): obj = self.parent.newinstance() self.obj = self._getobj() else: obj = self.parent.obj if inspect.ismethod(self.obj): setup_name = 'setup_method' teardown_name = 'teardown_method' else: setup_name = 'setup_function' teardown_name = 'teardown_function' setup_func_or_method = xunitsetup(obj, setup_name) if setup_func_or_method is not None: setup_func_or_method(self.obj) fin = getattr(obj, teardown_name, None) if fin is not None: self.addfinalizer(lambda: fin(self.obj)) def _prunetraceback(self, excinfo): if hasattr(self, '_obj') and not self.config.option.fulltrace: code = _pytest._code.Code(get_real_func(self.obj)) path, firstlineno = code.path, code.firstlineno traceback = excinfo.traceback ntraceback = traceback.cut(path=path, firstlineno=firstlineno) if ntraceback == traceback: ntraceback = ntraceback.cut(path=path) if ntraceback == traceback: #ntraceback = ntraceback.cut(excludepath=cutdir2) ntraceback = ntraceback.filter(filter_traceback) if not ntraceback: ntraceback = traceback excinfo.traceback = ntraceback.filter() # issue364: mark all but first and last frames to # only show a single-line message for each frame if self.config.option.tbstyle == "auto": if len(excinfo.traceback) > 2: for entry in excinfo.traceback[1:-1]: entry.set_repr_style('short') def _repr_failure_py(self, excinfo, style="long"): if excinfo.errisinstance(pytest.fail.Exception): if not excinfo.value.pytrace: return str(excinfo.value) return super(FunctionMixin, self)._repr_failure_py(excinfo, style=style) def repr_failure(self, excinfo, outerr=None): assert outerr is None, "XXX outerr usage is deprecated" style = self.config.option.tbstyle if style == "auto": style = "long" return self._repr_failure_py(excinfo, style=style) class Generator(FunctionMixin, PyCollector): def collect(self): # test generators are seen as collectors but they also # invoke setup/teardown on popular request # (induced by the common "test_*" naming shared with normal tests) self.session._setupstate.prepare(self) # see FunctionMixin.setup and test_setupstate_is_preserved_134 self._preservedparent = self.parent.obj l = [] seen = {} for i, x in enumerate(self.obj()): name, call, args = self.getcallargs(x) if not callable(call): raise TypeError("%r yielded non callable test %r" %(self.obj, call,)) if name is None: name = "[%d]" % i else: name = "['%s']" % name if name in seen: raise ValueError("%r generated tests with non-unique name %r" %(self, name)) seen[name] = True l.append(self.Function(name, self, args=args, callobj=call)) return l def getcallargs(self, obj): if not isinstance(obj, (tuple, list)): obj = (obj,) # explict naming if isinstance(obj[0], py.builtin._basestring): name = obj[0] obj = obj[1:] else: name = None call, args = obj[0], obj[1:] return name, call, args def hasinit(obj): init = getattr(obj, '__init__', None) if init: if init != object.__init__: return True def fillfixtures(function): """ fill missing funcargs for a test function. """ try: request = function._request except AttributeError: # XXX this special code path is only expected to execute # with the oejskit plugin. It uses classes with funcargs # and we thus have to work a bit to allow this. fm = function.session._fixturemanager fi = fm.getfixtureinfo(function.parent, function.obj, None) function._fixtureinfo = fi request = function._request = FixtureRequest(function) request._fillfixtures() # prune out funcargs for jstests newfuncargs = {} for name in fi.argnames: newfuncargs[name] = function.funcargs[name] function.funcargs = newfuncargs else: request._fillfixtures() _notexists = object() class CallSpec2(object): def __init__(self, metafunc): self.metafunc = metafunc self.funcargs = {} self._idlist = [] self.params = {} self._globalid = _notexists self._globalid_args = set() self._globalparam = _notexists self._arg2scopenum = {} # used for sorting parametrized resources self.keywords = {} self.indices = {} def copy(self, metafunc): cs = CallSpec2(self.metafunc) cs.funcargs.update(self.funcargs) cs.params.update(self.params) cs.keywords.update(self.keywords) cs.indices.update(self.indices) cs._arg2scopenum.update(self._arg2scopenum) cs._idlist = list(self._idlist) cs._globalid = self._globalid cs._globalid_args = self._globalid_args cs._globalparam = self._globalparam return cs def _checkargnotcontained(self, arg): if arg in self.params or arg in self.funcargs: raise ValueError("duplicate %r" %(arg,)) def getparam(self, name): try: return self.params[name] except KeyError: if self._globalparam is _notexists: raise ValueError(name) return self._globalparam @property def id(self): return "-".join(map(str, filter(None, self._idlist))) def setmulti(self, valtypes, argnames, valset, id, keywords, scopenum, param_index): for arg,val in zip(argnames, valset): self._checkargnotcontained(arg) valtype_for_arg = valtypes[arg] getattr(self, valtype_for_arg)[arg] = val self.indices[arg] = param_index self._arg2scopenum[arg] = scopenum if val is _notexists: self._emptyparamspecified = True self._idlist.append(id) self.keywords.update(keywords) def setall(self, funcargs, id, param): for x in funcargs: self._checkargnotcontained(x) self.funcargs.update(funcargs) if id is not _notexists: self._idlist.append(id) if param is not _notexists: assert self._globalparam is _notexists self._globalparam = param for arg in funcargs: self._arg2scopenum[arg] = scopenum_function class FuncargnamesCompatAttr: """ helper class so that Metafunc, Function and FixtureRequest don't need to each define the "funcargnames" compatibility attribute. """ @property def funcargnames(self): """ alias attribute for ``fixturenames`` for pre-2.3 compatibility""" return self.fixturenames
[docs]class Metafunc(FuncargnamesCompatAttr): """ Metafunc objects are passed to the ``pytest_generate_tests`` hook. They help to inspect a test function and to generate tests according to test configuration or values specified in the class or module where a test function is defined. :ivar fixturenames: set of fixture names required by the test function :ivar function: underlying python test function :ivar cls: class object where the test function is defined in or ``None``. :ivar module: the module object where the test function is defined in. :ivar config: access to the :class:`_pytest.config.Config` object for the test session. :ivar funcargnames: .. deprecated:: 2.3 Use ``fixturenames`` instead. """ def __init__(self, function, fixtureinfo, config, cls=None, module=None): self.config = config self.module = module self.function = function self.fixturenames = fixtureinfo.names_closure self._arg2fixturedefs = fixtureinfo.name2fixturedefs self.cls = cls self._calls = [] self._ids = py.builtin.set()
[docs] def parametrize(self, argnames, argvalues, indirect=False, ids=None, scope=None): """ Add new invocations to the underlying test function using the list of argvalues for the given argnames. Parametrization is performed during the collection phase. If you need to setup expensive resources see about setting indirect to do it rather at test setup time. :arg argnames: a comma-separated string denoting one or more argument names, or a list/tuple of argument strings. :arg argvalues: The list of argvalues determines how often a test is invoked with different argument values. If only one argname was specified argvalues is a list of values. If N argnames were specified, argvalues must be a list of N-tuples, where each tuple-element specifies a value for its respective argname. :arg indirect: The list of argnames or boolean. A list of arguments' names (subset of argnames). If True the list contains all names from the argnames. Each argvalue corresponding to an argname in this list will be passed as request.param to its respective argname fixture function so that it can perform more expensive setups during the setup phase of a test rather than at collection time. :arg ids: list of string ids, or a callable. If strings, each is corresponding to the argvalues so that they are part of the test id. If callable, it should take one argument (a single argvalue) and return a string or return None. If None, the automatically generated id for that argument will be used. If no ids are provided they will be generated automatically from the argvalues. :arg scope: if specified it denotes the scope of the parameters. The scope is used for grouping tests by parameter instances. It will also override any fixture-function defined scope, allowing to set a dynamic scope using test context or configuration. """ # individual parametrized argument sets can be wrapped in a series # of markers in which case we unwrap the values and apply the mark # at Function init newkeywords = {} unwrapped_argvalues = [] for i, argval in enumerate(argvalues): while isinstance(argval, MarkDecorator): newmark = MarkDecorator(argval.markname, argval.args[:-1], argval.kwargs) newmarks = newkeywords.setdefault(i, {}) newmarks[newmark.markname] = newmark argval = argval.args[-1] unwrapped_argvalues.append(argval) argvalues = unwrapped_argvalues if not isinstance(argnames, (tuple, list)): argnames = [x.strip() for x in argnames.split(",") if x.strip()] if len(argnames) == 1: argvalues = [(val,) for val in argvalues] if not argvalues: argvalues = [(_notexists,) * len(argnames)] if scope is None: scope = "function" scopenum = scopes.index(scope) valtypes = {} for arg in argnames: if arg not in self.fixturenames: raise ValueError("%r uses no fixture %r" %(self.function, arg)) if indirect is True: valtypes = dict.fromkeys(argnames, "params") elif indirect is False: valtypes = dict.fromkeys(argnames, "funcargs") elif isinstance(indirect, (tuple, list)): valtypes = dict.fromkeys(argnames, "funcargs") for arg in indirect: if arg not in argnames: raise ValueError("indirect given to %r: fixture %r doesn't exist" %( self.function, arg)) valtypes[arg] = "params" idfn = None if callable(ids): idfn = ids ids = None if ids and len(ids) != len(argvalues): raise ValueError('%d tests specified with %d ids' %( len(argvalues), len(ids))) if not ids: ids = idmaker(argnames, argvalues, idfn) newcalls = [] for callspec in self._calls or [CallSpec2(self)]: for param_index, valset in enumerate(argvalues): assert len(valset) == len(argnames) newcallspec = callspec.copy(self) newcallspec.setmulti(valtypes, argnames, valset, ids[param_index], newkeywords.get(param_index, {}), scopenum, param_index) newcalls.append(newcallspec) self._calls = newcalls
[docs] def addcall(self, funcargs=None, id=_notexists, param=_notexists): """ (deprecated, use parametrize) Add a new call to the underlying test function during the collection phase of a test run. Note that request.addcall() is called during the test collection phase prior and independently to actual test execution. You should only use addcall() if you need to specify multiple arguments of a test function. :arg funcargs: argument keyword dictionary used when invoking the test function. :arg id: used for reporting and identification purposes. If you don't supply an `id` an automatic unique id will be generated. :arg param: a parameter which will be exposed to a later fixture function invocation through the ``request.param`` attribute. """ assert funcargs is None or isinstance(funcargs, dict) if funcargs is not None: for name in funcargs: if name not in self.fixturenames: pytest.fail("funcarg %r not used in this function." % name) else: funcargs = {} if id is None: raise ValueError("id=None not allowed") if id is _notexists: id = len(self._calls) id = str(id) if id in self._ids: raise ValueError("duplicate id %r" % id) self._ids.add(id) cs = CallSpec2(self) cs.setall(funcargs, id, param) self._calls.append(cs)
if _PY3: import codecs def _escape_bytes(val): """ If val is pure ascii, returns it as a str(), otherwise escapes into a sequence of escaped bytes: b'\xc3\xb4\xc5\xd6' -> u'\\xc3\\xb4\\xc5\\xd6' note: the obvious "v.decode('unicode-escape')" will return valid utf-8 unicode if it finds them in the string, but we want to return escaped bytes for any byte, even if they match a utf-8 string. """ if val: # source: http://goo.gl/bGsnwC encoded_bytes, _ = codecs.escape_encode(val) return encoded_bytes.decode('ascii') else: # empty bytes crashes codecs.escape_encode (#1087) return '' else: def _escape_bytes(val): """ In py2 bytes and str are the same type, so return it unchanged if it is a full ascii string, otherwise escape it into its binary form. """ try: return val.decode('ascii') except UnicodeDecodeError: return val.encode('string-escape') def _idval(val, argname, idx, idfn): if idfn: try: s = idfn(val) if s: return s except Exception: pass if isinstance(val, bytes): return _escape_bytes(val) elif isinstance(val, (float, int, str, bool, NoneType)): return str(val) elif isinstance(val, REGEX_TYPE): return val.pattern elif enum is not None and isinstance(val, enum.Enum): return str(val) elif isclass(val) and hasattr(val, '__name__'): return val.__name__ elif _PY2 and isinstance(val, unicode): # special case for python 2: if a unicode string is # convertible to ascii, return it as an str() object instead try: return str(val) except UnicodeError: # fallthrough pass return str(argname)+str(idx) def _idvalset(idx, valset, argnames, idfn): this_id = [_idval(val, argname, idx, idfn) for val, argname in zip(valset, argnames)] return "-".join(this_id) def idmaker(argnames, argvalues, idfn=None): ids = [_idvalset(valindex, valset, argnames, idfn) for valindex, valset in enumerate(argvalues)] if len(set(ids)) < len(ids): # user may have provided a bad idfn which means the ids are not unique ids = [str(i) + testid for i, testid in enumerate(ids)] return ids def showfixtures(config): from _pytest.main import wrap_session return wrap_session(config, _showfixtures_main) def _showfixtures_main(config, session): import _pytest.config session.perform_collect() curdir = py.path.local() tw = _pytest.config.create_terminal_writer(config) verbose = config.getvalue("verbose") fm = session._fixturemanager available = [] for argname, fixturedefs in fm._arg2fixturedefs.items(): assert fixturedefs is not None if not fixturedefs: continue fixturedef = fixturedefs[-1] loc = getlocation(fixturedef.func, curdir) available.append((len(fixturedef.baseid), fixturedef.func.__module__, curdir.bestrelpath(loc), fixturedef.argname, fixturedef)) available.sort() currentmodule = None for baseid, module, bestrel, argname, fixturedef in available: if currentmodule != module: if not module.startswith("_pytest."): tw.line() tw.sep("-", "fixtures defined from %s" %(module,)) currentmodule = module if verbose <= 0 and argname[0] == "_": continue if verbose > 0: funcargspec = "%s -- %s" %(argname, bestrel,) else: funcargspec = argname tw.line(funcargspec, green=True) loc = getlocation(fixturedef.func, curdir) doc = fixturedef.func.__doc__ or "" if doc: for line in doc.strip().split("\n"): tw.line(" " + line.strip()) else: tw.line(" %s: no docstring available" %(loc,), red=True) def getlocation(function, curdir): import inspect fn = py.path.local(inspect.getfile(function)) lineno = py.builtin._getcode(function).co_firstlineno if fn.relto(curdir): fn = fn.relto(curdir) return "%s:%d" %(fn, lineno+1) # builtin pytest.raises helper
[docs]def raises(expected_exception, *args, **kwargs): """ assert that a code block/function call raises ``expected_exception`` and raise a failure exception otherwise. This helper produces a ``ExceptionInfo()`` object (see below). If using Python 2.5 or above, you may use this function as a context manager:: >>> with raises(ZeroDivisionError): ... 1/0 .. note:: When using ``pytest.raises`` as a context manager, it's worthwhile to note that normal context manager rules apply and that the exception raised *must* be the final line in the scope of the context manager. Lines of code after that, within the scope of the context manager will not be executed. For example:: >>> with raises(OSError) as exc_info: assert 1 == 1 # this will execute as expected raise OSError(errno.EEXISTS, 'directory exists') assert exc_info.value.errno == errno.EEXISTS # this will not execute Instead, the following approach must be taken (note the difference in scope):: >>> with raises(OSError) as exc_info: assert 1 == 1 # this will execute as expected raise OSError(errno.EEXISTS, 'directory exists') assert exc_info.value.errno == errno.EEXISTS # this will now execute Or you can specify a callable by passing a to-be-called lambda:: >>> raises(ZeroDivisionError, lambda: 1/0) <ExceptionInfo ...> or you can specify an arbitrary callable with arguments:: >>> def f(x): return 1/x ... >>> raises(ZeroDivisionError, f, 0) <ExceptionInfo ...> >>> raises(ZeroDivisionError, f, x=0) <ExceptionInfo ...> A third possibility is to use a string to be executed:: >>> raises(ZeroDivisionError, "f(0)") <ExceptionInfo ...> .. autoclass:: _pytest._code.ExceptionInfo :members: .. note:: Similar to caught exception objects in Python, explicitly clearing local references to returned ``ExceptionInfo`` objects can help the Python interpreter speed up its garbage collection. Clearing those references breaks a reference cycle (``ExceptionInfo`` --> caught exception --> frame stack raising the exception --> current frame stack --> local variables --> ``ExceptionInfo``) which makes Python keep all objects referenced from that cycle (including all local variables in the current frame) alive until the next cyclic garbage collection run. See the official Python ``try`` statement documentation for more detailed information. """ __tracebackhide__ = True if expected_exception is AssertionError: # we want to catch a AssertionError # replace our subclass with the builtin one # see https://github.com/pytest-dev/pytest/issues/176 from _pytest.assertion.util import BuiltinAssertionError \ as expected_exception msg = ("exceptions must be old-style classes or" " derived from BaseException, not %s") if isinstance(expected_exception, tuple): for exc in expected_exception: if not isclass(exc): raise TypeError(msg % type(exc)) elif not isclass(expected_exception): raise TypeError(msg % type(expected_exception)) if not args: return RaisesContext(expected_exception) elif isinstance(args[0], str): code, = args assert isinstance(code, str) frame = sys._getframe(1) loc = frame.f_locals.copy() loc.update(kwargs) #print "raises frame scope: %r" % frame.f_locals try: code = _pytest._code.Source(code).compile() py.builtin.exec_(code, frame.f_globals, loc) # XXX didn'T mean f_globals == f_locals something special? # this is destroyed here ... except expected_exception: return _pytest._code.ExceptionInfo() else: func = args[0] try: func(*args[1:], **kwargs) except expected_exception: return _pytest._code.ExceptionInfo() pytest.fail("DID NOT RAISE {0}".format(expected_exception))
class RaisesContext(object): def __init__(self, expected_exception): self.expected_exception = expected_exception self.excinfo = None def __enter__(self): self.excinfo = object.__new__(_pytest._code.ExceptionInfo) return self.excinfo def __exit__(self, *tp): __tracebackhide__ = True if tp[0] is None: pytest.fail("DID NOT RAISE") if sys.version_info < (2, 7): # py26: on __exit__() exc_value often does not contain the # exception value. # http://bugs.python.org/issue7853 if not isinstance(tp[1], BaseException): exc_type, value, traceback = tp tp = exc_type, exc_type(value), traceback self.excinfo.__init__(tp) return issubclass(self.excinfo.type, self.expected_exception) # # the basic pytest Function item #
[docs]class Function(FunctionMixin, pytest.Item, FuncargnamesCompatAttr): """ a Function Item is responsible for setting up and executing a Python test function. """ _genid = None def __init__(self, name, parent, args=None, config=None, callspec=None, callobj=NOTSET, keywords=None, session=None, fixtureinfo=None): super(Function, self).__init__(name, parent, config=config, session=session) self._args = args if callobj is not NOTSET: self.obj = callobj self.keywords.update(self.obj.__dict__) if callspec: self.callspec = callspec self.keywords.update(callspec.keywords) if keywords: self.keywords.update(keywords) if fixtureinfo is None: fixtureinfo = self.session._fixturemanager.getfixtureinfo( self.parent, self.obj, self.cls, funcargs=not self._isyieldedfunction()) self._fixtureinfo = fixtureinfo self.fixturenames = fixtureinfo.names_closure self._initrequest() def _initrequest(self): self.funcargs = {} if self._isyieldedfunction(): assert not hasattr(self, "callspec"), ( "yielded functions (deprecated) cannot have funcargs") else: if hasattr(self, "callspec"): callspec = self.callspec assert not callspec.funcargs self._genid = callspec.id if hasattr(callspec, "param"): self.param = callspec.param self._request = FixtureRequest(self) @property def function(self): "underlying python 'function' object" return getattr(self.obj, 'im_func', self.obj) def _getobj(self): name = self.name i = name.find("[") # parametrization if i != -1: name = name[:i] return getattr(self.parent.obj, name) @property def _pyfuncitem(self): "(compatonly) for code expecting pytest-2.2 style request objects" return self def _isyieldedfunction(self): return getattr(self, "_args", None) is not None
[docs] def runtest(self): """ execute the underlying test function. """ self.ihook.pytest_pyfunc_call(pyfuncitem=self)
def setup(self): # check if parametrization happend with an empty list try: self.callspec._emptyparamspecified except AttributeError: pass else: fs, lineno = self._getfslineno() pytest.skip("got empty parameter set, function %s at %s:%d" %( self.function.__name__, fs, lineno)) super(Function, self).setup() fillfixtures(self)
scope2props = dict(session=()) scope2props["module"] = ("fspath", "module") scope2props["class"] = scope2props["module"] + ("cls",) scope2props["instance"] = scope2props["class"] + ("instance", ) scope2props["function"] = scope2props["instance"] + ("function", "keywords") def scopeproperty(name=None, doc=None): def decoratescope(func): scopename = name or func.__name__ def provide(self): if func.__name__ in scope2props[self.scope]: return func(self) raise AttributeError("%s not available in %s-scoped context" % ( scopename, self.scope)) return property(provide, None, None, func.__doc__) return decoratescope
[docs]class FixtureRequest(FuncargnamesCompatAttr): """ A request for a fixture from a test or fixture function. A request object gives access to the requesting test context and has an optional ``param`` attribute in case the fixture is parametrized indirectly. """ def __init__(self, pyfuncitem): self._pyfuncitem = pyfuncitem #: fixture for which this request is being performed self.fixturename = None #: Scope string, one of "function", "cls", "module", "session" self.scope = "function" self._funcargs = {} self._fixturedefs = {} fixtureinfo = pyfuncitem._fixtureinfo self._arg2fixturedefs = fixtureinfo.name2fixturedefs.copy() self._arg2index = {} self.fixturenames = fixtureinfo.names_closure self._fixturemanager = pyfuncitem.session._fixturemanager @property def node(self): """ underlying collection node (depends on current request scope)""" return self._getscopeitem(self.scope) def _getnextfixturedef(self, argname): fixturedefs = self._arg2fixturedefs.get(argname, None) if fixturedefs is None: # we arrive here because of a a dynamic call to # getfuncargvalue(argname) usage which was naturally # not known at parsing/collection time fixturedefs = self._fixturemanager.getfixturedefs( argname, self._pyfuncitem.parent.nodeid) self._arg2fixturedefs[argname] = fixturedefs # fixturedefs list is immutable so we maintain a decreasing index index = self._arg2index.get(argname, 0) - 1 if fixturedefs is None or (-index > len(fixturedefs)): raise FixtureLookupError(argname, self) self._arg2index[argname] = index return fixturedefs[index] @property def config(self): """ the pytest config object associated with this request. """ return self._pyfuncitem.config @scopeproperty() def function(self): """ test function object if the request has a per-function scope. """ return self._pyfuncitem.obj @scopeproperty("class") def cls(self): """ class (can be None) where the test function was collected. """ clscol = self._pyfuncitem.getparent(pytest.Class) if clscol: return clscol.obj @property def instance(self): """ instance (can be None) on which test function was collected. """ # unittest support hack, see _pytest.unittest.TestCaseFunction try: return self._pyfuncitem._testcase except AttributeError: function = getattr(self, "function", None) if function is not None: return py.builtin._getimself(function) @scopeproperty() def module(self): """ python module object where the test function was collected. """ return self._pyfuncitem.getparent(pytest.Module).obj @scopeproperty() def fspath(self): """ the file system path of the test module which collected this test. """ return self._pyfuncitem.fspath @property def keywords(self): """ keywords/markers dictionary for the underlying node. """ return self.node.keywords @property def session(self): """ pytest session object. """ return self._pyfuncitem.session
[docs] def addfinalizer(self, finalizer): """ add finalizer/teardown function to be called after the last test within the requesting test context finished execution. """ # XXX usually this method is shadowed by fixturedef specific ones self._addfinalizer(finalizer, scope=self.scope)
def _addfinalizer(self, finalizer, scope): colitem = self._getscopeitem(scope) self._pyfuncitem.session._setupstate.addfinalizer( finalizer=finalizer, colitem=colitem)
[docs] def applymarker(self, marker): """ Apply a marker to a single test function invocation. This method is useful if you don't want to have a keyword/marker on all function invocations. :arg marker: a :py:class:`_pytest.mark.MarkDecorator` object created by a call to ``pytest.mark.NAME(...)``. """ try: self.node.keywords[marker.markname] = marker except AttributeError: raise ValueError(marker)
[docs] def raiseerror(self, msg): """ raise a FixtureLookupError with the given message. """ raise self._fixturemanager.FixtureLookupError(None, self, msg)
def _fillfixtures(self): item = self._pyfuncitem fixturenames = getattr(item, "fixturenames", self.fixturenames) for argname in fixturenames: if argname not in item.funcargs: item.funcargs[argname] = self.getfuncargvalue(argname)
[docs] def cached_setup(self, setup, teardown=None, scope="module", extrakey=None): """ (deprecated) Return a testing resource managed by ``setup`` & ``teardown`` calls. ``scope`` and ``extrakey`` determine when the ``teardown`` function will be called so that subsequent calls to ``setup`` would recreate the resource. With pytest-2.3 you often do not need ``cached_setup()`` as you can directly declare a scope on a fixture function and register a finalizer through ``request.addfinalizer()``. :arg teardown: function receiving a previously setup resource. :arg setup: a no-argument function creating a resource. :arg scope: a string value out of ``function``, ``class``, ``module`` or ``session`` indicating the caching lifecycle of the resource. :arg extrakey: added to internal caching key of (funcargname, scope). """ if not hasattr(self.config, '_setupcache'): self.config._setupcache = {} # XXX weakref? cachekey = (self.fixturename, self._getscopeitem(scope), extrakey) cache = self.config._setupcache try: val = cache[cachekey] except KeyError: self._check_scope(self.fixturename, self.scope, scope) val = setup() cache[cachekey] = val if teardown is not None: def finalizer(): del cache[cachekey] teardown(val) self._addfinalizer(finalizer, scope=scope) return val
[docs] def getfuncargvalue(self, argname): """ Dynamically retrieve a named fixture function argument. As of pytest-2.3, it is easier and usually better to access other fixture values by stating it as an input argument in the fixture function. If you only can decide about using another fixture at test setup time, you may use this function to retrieve it inside a fixture function body. """ return self._get_active_fixturedef(argname).cached_result[0]
def _get_active_fixturedef(self, argname): try: return self._fixturedefs[argname] except KeyError: try: fixturedef = self._getnextfixturedef(argname) except FixtureLookupError: if argname == "request": class PseudoFixtureDef: cached_result = (self, [0], None) scope = "function" return PseudoFixtureDef raise # remove indent to prevent the python3 exception # from leaking into the call result = self._getfuncargvalue(fixturedef) self._funcargs[argname] = result self._fixturedefs[argname] = fixturedef return fixturedef def _get_fixturestack(self): current = self l = [] while 1: fixturedef = getattr(current, "_fixturedef", None) if fixturedef is None: l.reverse() return l l.append(fixturedef) current = current._parent_request def _getfuncargvalue(self, fixturedef): # prepare a subrequest object before calling fixture function # (latter managed by fixturedef) argname = fixturedef.argname funcitem = self._pyfuncitem scope = fixturedef.scope try: param = funcitem.callspec.getparam(argname) except (AttributeError, ValueError): param = NOTSET param_index = 0 else: # indices might not be set if old-style metafunc.addcall() was used param_index = funcitem.callspec.indices.get(argname, 0) # if a parametrize invocation set a scope it will override # the static scope defined with the fixture function paramscopenum = funcitem.callspec._arg2scopenum.get(argname) if paramscopenum is not None: scope = scopes[paramscopenum] subrequest = SubRequest(self, scope, param, param_index, fixturedef) # check if a higher-level scoped fixture accesses a lower level one subrequest._check_scope(argname, self.scope, scope) # clear sys.exc_info before invoking the fixture (python bug?) # if its not explicitly cleared it will leak into the call exc_clear() try: # call the fixture function val = fixturedef.execute(request=subrequest) finally: # if fixture function failed it might have registered finalizers self.session._setupstate.addfinalizer(fixturedef.finish, subrequest.node) return val def _check_scope(self, argname, invoking_scope, requested_scope): if argname == "request": return if scopemismatch(invoking_scope, requested_scope): # try to report something helpful lines = self._factorytraceback() pytest.fail("ScopeMismatch: You tried to access the %r scoped " "fixture %r with a %r scoped request object, " "involved factories\n%s" %( (requested_scope, argname, invoking_scope, "\n".join(lines))), pytrace=False) def _factorytraceback(self): lines = [] for fixturedef in self._get_fixturestack(): factory = fixturedef.func fs, lineno = getfslineno(factory) p = self._pyfuncitem.session.fspath.bestrelpath(fs) args = _format_args(factory) lines.append("%s:%d: def %s%s" %( p, lineno, factory.__name__, args)) return lines def _getscopeitem(self, scope): if scope == "function": # this might also be a non-function Item despite its attribute name return self._pyfuncitem node = get_scope_node(self._pyfuncitem, scope) if node is None and scope == "class": # fallback to function item itself node = self._pyfuncitem assert node return node def __repr__(self): return "<FixtureRequest for %r>" %(self.node)
class SubRequest(FixtureRequest): """ a sub request for handling getting a fixture from a test function/fixture. """ def __init__(self, request, scope, param, param_index, fixturedef): self._parent_request = request self.fixturename = fixturedef.argname if param is not NOTSET: self.param = param self.param_index = param_index self.scope = scope self._fixturedef = fixturedef self.addfinalizer = fixturedef.addfinalizer self._pyfuncitem = request._pyfuncitem self._funcargs = request._funcargs self._fixturedefs = request._fixturedefs self._arg2fixturedefs = request._arg2fixturedefs self._arg2index = request._arg2index self.fixturenames = request.fixturenames self._fixturemanager = request._fixturemanager def __repr__(self): return "<SubRequest %r for %r>" % (self.fixturename, self._pyfuncitem) class ScopeMismatchError(Exception): """ A fixture function tries to use a different fixture function which which has a lower scope (e.g. a Session one calls a function one) """ scopes = "session module class function".split() scopenum_function = scopes.index("function") def scopemismatch(currentscope, newscope): return scopes.index(newscope) > scopes.index(currentscope) class FixtureLookupError(LookupError): """ could not return a requested Fixture (missing or invalid). """ def __init__(self, argname, request, msg=None): self.argname = argname self.request = request self.fixturestack = request._get_fixturestack() self.msg = msg def formatrepr(self): tblines = [] addline = tblines.append stack = [self.request._pyfuncitem.obj] stack.extend(map(lambda x: x.func, self.fixturestack)) msg = self.msg if msg is not None: # the last fixture raise an error, let's present # it at the requesting side stack = stack[:-1] for function in stack: fspath, lineno = getfslineno(function) try: lines, _ = inspect.getsourcelines(get_real_func(function)) except (IOError, IndexError): error_msg = "file %s, line %s: source code not available" addline(error_msg % (fspath, lineno+1)) else: addline("file %s, line %s" % (fspath, lineno+1)) for i, line in enumerate(lines): line = line.rstrip() addline(" " + line) if line.lstrip().startswith('def'): break if msg is None: fm = self.request._fixturemanager available = [] for name, fixturedef in fm._arg2fixturedefs.items(): parentid = self.request._pyfuncitem.parent.nodeid faclist = list(fm._matchfactories(fixturedef, parentid)) if faclist: available.append(name) msg = "fixture %r not found" % (self.argname,) msg += "\n available fixtures: %s" %(", ".join(available),) msg += "\n use 'py.test --fixtures [testpath]' for help on them." return FixtureLookupErrorRepr(fspath, lineno, tblines, msg, self.argname) class FixtureLookupErrorRepr(TerminalRepr): def __init__(self, filename, firstlineno, tblines, errorstring, argname): self.tblines = tblines self.errorstring = errorstring self.filename = filename self.firstlineno = firstlineno self.argname = argname def toterminal(self, tw): #tw.line("FixtureLookupError: %s" %(self.argname), red=True) for tbline in self.tblines: tw.line(tbline.rstrip()) for line in self.errorstring.split("\n"): tw.line(" " + line.strip(), red=True) tw.line() tw.line("%s:%d" % (self.filename, self.firstlineno+1)) class FixtureManager: """ pytest fixtures definitions and information is stored and managed from this class. During collection fm.parsefactories() is called multiple times to parse fixture function definitions into FixtureDef objects and internal data structures. During collection of test functions, metafunc-mechanics instantiate a FuncFixtureInfo object which is cached per node/func-name. This FuncFixtureInfo object is later retrieved by Function nodes which themselves offer a fixturenames attribute. The FuncFixtureInfo object holds information about fixtures and FixtureDefs relevant for a particular function. An initial list of fixtures is assembled like this: - ini-defined usefixtures - autouse-marked fixtures along the collection chain up from the function - usefixtures markers at module/class/function level - test function funcargs Subsequently the funcfixtureinfo.fixturenames attribute is computed as the closure of the fixtures needed to setup the initial fixtures, i. e. fixtures needed by fixture functions themselves are appended to the fixturenames list. Upon the test-setup phases all fixturenames are instantiated, retrieved by a lookup of their FuncFixtureInfo. """ _argprefix = "pytest_funcarg__" FixtureLookupError = FixtureLookupError FixtureLookupErrorRepr = FixtureLookupErrorRepr def __init__(self, session): self.session = session self.config = session.config self._arg2fixturedefs = {} self._holderobjseen = set() self._arg2finish = {} self._nodeid_and_autousenames = [("", self.config.getini("usefixtures"))] session.config.pluginmanager.register(self, "funcmanage") def getfixtureinfo(self, node, func, cls, funcargs=True): if funcargs and not hasattr(node, "nofuncargs"): if cls is not None: startindex = 1 else: startindex = None argnames = getfuncargnames(func, startindex) else: argnames = () usefixtures = getattr(func, "usefixtures", None) initialnames = argnames if usefixtures is not None: initialnames = usefixtures.args + initialnames fm = node.session._fixturemanager names_closure, arg2fixturedefs = fm.getfixtureclosure(initialnames, node) return FuncFixtureInfo(argnames, names_closure, arg2fixturedefs) def pytest_plugin_registered(self, plugin): nodeid = None try: p = py.path.local(plugin.__file__) except AttributeError: pass else: # construct the base nodeid which is later used to check # what fixtures are visible for particular tests (as denoted # by their test id) if p.basename.startswith("conftest.py"): nodeid = p.dirpath().relto(self.config.rootdir) if p.sep != "/": nodeid = nodeid.replace(p.sep, "/") self.parsefactories(plugin, nodeid) def _getautousenames(self, nodeid): """ return a tuple of fixture names to be used. """ autousenames = [] for baseid, basenames in self._nodeid_and_autousenames: if nodeid.startswith(baseid): if baseid: i = len(baseid) nextchar = nodeid[i:i+1] if nextchar and nextchar not in ":/": continue autousenames.extend(basenames) # make sure autousenames are sorted by scope, scopenum 0 is session autousenames.sort( key=lambda x: self._arg2fixturedefs[x][-1].scopenum) return autousenames def getfixtureclosure(self, fixturenames, parentnode): # collect the closure of all fixtures , starting with the given # fixturenames as the initial set. As we have to visit all # factory definitions anyway, we also return a arg2fixturedefs # mapping so that the caller can reuse it and does not have # to re-discover fixturedefs again for each fixturename # (discovering matching fixtures for a given name/node is expensive) parentid = parentnode.nodeid fixturenames_closure = self._getautousenames(parentid) def merge(otherlist): for arg in otherlist: if arg not in fixturenames_closure: fixturenames_closure.append(arg) merge(fixturenames) arg2fixturedefs = {} lastlen = -1 while lastlen != len(fixturenames_closure): lastlen = len(fixturenames_closure) for argname in fixturenames_closure: if argname in arg2fixturedefs: continue fixturedefs = self.getfixturedefs(argname, parentid) if fixturedefs: arg2fixturedefs[argname] = fixturedefs merge(fixturedefs[-1].argnames) return fixturenames_closure, arg2fixturedefs def pytest_generate_tests(self, metafunc): for argname in metafunc.fixturenames: faclist = metafunc._arg2fixturedefs.get(argname) if faclist: fixturedef = faclist[-1] if fixturedef.params is not None: func_params = getattr(getattr(metafunc.function, 'parametrize', None), 'args', [[None]]) # skip directly parametrized arguments argnames = func_params[0] if not isinstance(argnames, (tuple, list)): argnames = [x.strip() for x in argnames.split(",") if x.strip()] if argname not in func_params and argname not in argnames: metafunc.parametrize(argname, fixturedef.params, indirect=True, scope=fixturedef.scope, ids=fixturedef.ids) else: continue # will raise FixtureLookupError at setup time def pytest_collection_modifyitems(self, items): # separate parametrized setups items[:] = reorder_items(items) def parsefactories(self, node_or_obj, nodeid=NOTSET, unittest=False): if nodeid is not NOTSET: holderobj = node_or_obj else: holderobj = node_or_obj.obj nodeid = node_or_obj.nodeid if holderobj in self._holderobjseen: return self._holderobjseen.add(holderobj) autousenames = [] for name in dir(holderobj): obj = getattr(holderobj, name, None) # fixture functions have a pytest_funcarg__ prefix (pre-2.3 style) # or are "@pytest.fixture" marked marker = getfixturemarker(obj) if marker is None: if not name.startswith(self._argprefix): continue if not callable(obj): continue marker = defaultfuncargprefixmarker name = name[len(self._argprefix):] elif not isinstance(marker, FixtureFunctionMarker): # magic globals with __getattr__ might have got us a wrong # fixture attribute continue else: assert not name.startswith(self._argprefix) fixturedef = FixtureDef(self, nodeid, name, obj, marker.scope, marker.params, yieldctx=marker.yieldctx, unittest=unittest, ids=marker.ids) faclist = self._arg2fixturedefs.setdefault(name, []) if fixturedef.has_location: faclist.append(fixturedef) else: # fixturedefs with no location are at the front # so this inserts the current fixturedef after the # existing fixturedefs from external plugins but # before the fixturedefs provided in conftests. i = len([f for f in faclist if not f.has_location]) faclist.insert(i, fixturedef) if marker.autouse: autousenames.append(name) if autousenames: self._nodeid_and_autousenames.append((nodeid or '', autousenames)) def getfixturedefs(self, argname, nodeid): try: fixturedefs = self._arg2fixturedefs[argname] except KeyError: return None else: return tuple(self._matchfactories(fixturedefs, nodeid)) def _matchfactories(self, fixturedefs, nodeid): for fixturedef in fixturedefs: if nodeid.startswith(fixturedef.baseid): yield fixturedef def fail_fixturefunc(fixturefunc, msg): fs, lineno = getfslineno(fixturefunc) location = "%s:%s" % (fs, lineno+1) source = _pytest._code.Source(fixturefunc) pytest.fail(msg + ":\n\n" + str(source.indent()) + "\n" + location, pytrace=False) def call_fixture_func(fixturefunc, request, kwargs, yieldctx): if yieldctx: if not is_generator(fixturefunc): fail_fixturefunc(fixturefunc, msg="yield_fixture requires yield statement in function") iter = fixturefunc(**kwargs) next = getattr(iter, "__next__", None) if next is None: next = getattr(iter, "next") res = next() def teardown(): try: next() except StopIteration: pass else: fail_fixturefunc(fixturefunc, "yield_fixture function has more than one 'yield'") request.addfinalizer(teardown) else: if is_generator(fixturefunc): fail_fixturefunc(fixturefunc, msg="pytest.fixture functions cannot use ``yield``. " "Instead write and return an inner function/generator " "and let the consumer call and iterate over it.") res = fixturefunc(**kwargs) return res class FixtureDef: """ A container for a factory definition. """ def __init__(self, fixturemanager, baseid, argname, func, scope, params, yieldctx, unittest=False, ids=None): self._fixturemanager = fixturemanager self.baseid = baseid or '' self.has_location = baseid is not None self.func = func self.argname = argname self.scope = scope self.scopenum = scopes.index(scope or "function") self.params = params startindex = unittest and 1 or None self.argnames = getfuncargnames(func, startindex=startindex) self.yieldctx = yieldctx self.unittest = unittest self.ids = ids self._finalizer = [] def addfinalizer(self, finalizer): self._finalizer.append(finalizer) def finish(self): try: while self._finalizer: func = self._finalizer.pop() func() finally: # even if finalization fails, we invalidate # the cached fixture value if hasattr(self, "cached_result"): del self.cached_result def execute(self, request): # get required arguments and register our own finish() # with their finalization kwargs = {} for argname in self.argnames: fixturedef = request._get_active_fixturedef(argname) result, arg_cache_key, exc = fixturedef.cached_result request._check_scope(argname, request.scope, fixturedef.scope) kwargs[argname] = result if argname != "request": fixturedef.addfinalizer(self.finish) my_cache_key = request.param_index cached_result = getattr(self, "cached_result", None) if cached_result is not None: result, cache_key, err = cached_result if my_cache_key == cache_key: if err is not None: py.builtin._reraise(*err) else: return result # we have a previous but differently parametrized fixture instance # so we need to tear it down before creating a new one self.finish() assert not hasattr(self, "cached_result") fixturefunc = self.func if self.unittest: if request.instance is not None: # bind the unbound method to the TestCase instance fixturefunc = self.func.__get__(request.instance) else: # the fixture function needs to be bound to the actual # request.instance so that code working with "self" behaves # as expected. if request.instance is not None: fixturefunc = getimfunc(self.func) if fixturefunc != self.func: fixturefunc = fixturefunc.__get__(request.instance) try: result = call_fixture_func(fixturefunc, request, kwargs, self.yieldctx) except Exception: self.cached_result = (None, my_cache_key, sys.exc_info()) raise self.cached_result = (result, my_cache_key, None) return result def __repr__(self): return ("<FixtureDef name=%r scope=%r baseid=%r >" % (self.argname, self.scope, self.baseid)) def num_mock_patch_args(function): """ return number of arguments used up by mock arguments (if any) """ patchings = getattr(function, "patchings", None) if not patchings: return 0 mock = sys.modules.get("mock", sys.modules.get("unittest.mock", None)) if mock is not None: return len([p for p in patchings if not p.attribute_name and p.new is mock.DEFAULT]) return len(patchings) def getfuncargnames(function, startindex=None): # XXX merge with main.py's varnames #assert not isclass(function) realfunction = function while hasattr(realfunction, "__wrapped__"): realfunction = realfunction.__wrapped__ if startindex is None: startindex = inspect.ismethod(function) and 1 or 0 if realfunction != function: startindex += num_mock_patch_args(function) function = realfunction if isinstance(function, functools.partial): argnames = inspect.getargs(_pytest._code.getrawcode(function.func))[0] partial = function argnames = argnames[len(partial.args):] if partial.keywords: for kw in partial.keywords: argnames.remove(kw) else: argnames = inspect.getargs(_pytest._code.getrawcode(function))[0] defaults = getattr(function, 'func_defaults', getattr(function, '__defaults__', None)) or () numdefaults = len(defaults) if numdefaults: return tuple(argnames[startindex:-numdefaults]) return tuple(argnames[startindex:]) # algorithm for sorting on a per-parametrized resource setup basis # it is called for scopenum==0 (session) first and performs sorting # down to the lower scopes such as to minimize number of "high scope" # setups and teardowns def reorder_items(items): argkeys_cache = {} for scopenum in range(0, scopenum_function): argkeys_cache[scopenum] = d = {} for item in items: keys = set(get_parametrized_fixture_keys(item, scopenum)) if keys: d[item] = keys return reorder_items_atscope(items, set(), argkeys_cache, 0) def reorder_items_atscope(items, ignore, argkeys_cache, scopenum): if scopenum >= scopenum_function or len(items) < 3: return items items_done = [] while 1: items_before, items_same, items_other, newignore = \ slice_items(items, ignore, argkeys_cache[scopenum]) items_before = reorder_items_atscope( items_before, ignore, argkeys_cache,scopenum+1) if items_same is None: # nothing to reorder in this scope assert items_other is None return items_done + items_before items_done.extend(items_before) items = items_same + items_other ignore = newignore def slice_items(items, ignore, scoped_argkeys_cache): # we pick the first item which uses a fixture instance in the # requested scope and which we haven't seen yet. We slice the input # items list into a list of items_nomatch, items_same and # items_other if scoped_argkeys_cache: # do we need to do work at all? it = iter(items) # first find a slicing key for i, item in enumerate(it): argkeys = scoped_argkeys_cache.get(item) if argkeys is not None: argkeys = argkeys.difference(ignore) if argkeys: # found a slicing key slicing_argkey = argkeys.pop() items_before = items[:i] items_same = [item] items_other = [] # now slice the remainder of the list for item in it: argkeys = scoped_argkeys_cache.get(item) if argkeys and slicing_argkey in argkeys and \ slicing_argkey not in ignore: items_same.append(item) else: items_other.append(item) newignore = ignore.copy() newignore.add(slicing_argkey) return (items_before, items_same, items_other, newignore) return items, None, None, None def get_parametrized_fixture_keys(item, scopenum): """ return list of keys for all parametrized arguments which match the specified scope. """ assert scopenum < scopenum_function # function try: cs = item.callspec except AttributeError: pass else: # cs.indictes.items() is random order of argnames but # then again different functions (items) can change order of # arguments so it doesn't matter much probably for argname, param_index in cs.indices.items(): if cs._arg2scopenum[argname] != scopenum: continue if scopenum == 0: # session key = (argname, param_index) elif scopenum == 1: # module key = (argname, param_index, item.fspath) elif scopenum == 2: # class key = (argname, param_index, item.fspath, item.cls) yield key def xunitsetup(obj, name): meth = getattr(obj, name, None) if getfixturemarker(meth) is None: return meth def getfixturemarker(obj): """ return fixturemarker or None if it doesn't exist or raised exceptions.""" try: return getattr(obj, "_pytestfixturefunction", None) except KeyboardInterrupt: raise except Exception: # some objects raise errors like request (from flask import request) # we don't expect them to be fixture functions return None scopename2class = { 'class': Class, 'module': Module, 'function': pytest.Item, } def get_scope_node(node, scope): cls = scopename2class.get(scope) if cls is None: if scope == "session": return node.session raise ValueError("unknown scope") return node.getparent(cls)