""" Python test discovery, setup and run of test functions. """ import py import inspect import sys import pytest from _pytest.main import getfslineno, getfuncargnames, readscope from _pytest.monkeypatch import monkeypatch import _pytest cutdir = py.path.local(_pytest.__file__).dirpath() def cached_property(f): """returns a cached property that is calculated by function f. taken from http://code.activestate.com/recipes/576563-cached-property/""" def get(self): try: return self._property_cache[f] except AttributeError: self._property_cache = {} x = self._property_cache[f] = f(self) return x except KeyError: x = self._property_cache[f] = f(self) return x return property(get) 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('--funcargs', action="store_true", dest="showfuncargs", default=False, help="show available function arguments, sorted by plugin") 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 for Python test class discovery") parser.addini("python_functions", type="args", default=("test",), help="prefixes for Python test function and method discovery") def pytest_cmdline_main(config): if config.option.showfuncargs: showfuncargs(config) return 0 def pytest_generate_tests(metafunc): try: param = metafunc.function.parametrize except AttributeError: return for p in param: metafunc.parametrize(*p.args, **p.kwargs) def pytest_configure(config): config.addinivalue_line("markers", "parametrize(argnames, argvalues): call a test function multiple " "times passing in multiple different argument value sets. Example: " "@parametrize('arg1', [1,2]) would lead to two calls of the decorated " "test function, one with arg1=1 and another with arg1=2." ) @pytest.mark.trylast def pytest_namespace(): raises.Exception = pytest.fail.Exception return { 'raises' : raises, 'collect': { 'Module': Module, 'Class': Class, 'Instance': Instance, 'Function': Function, 'Generator': Generator, '_fillfuncargs': fillfuncargs} } def pytest_funcarg__pytestconfig(request): """ the pytest config object with access to command line opts.""" return request.config def pytest_pyfunc_call(__multicall__, pyfuncitem): if not __multicall__.execute(): testfunction = pyfuncitem.obj if pyfuncitem._isyieldedfunction(): testfunction(*pyfuncitem._args) else: try: funcargnames = pyfuncitem.funcargnames except AttributeError: funcargs = pyfuncitem.funcargs else: funcargs = {} for name in funcargnames: funcargs[name] = pyfuncitem.funcargs[name] testfunction(**funcargs) def pytest_pyfunc_call(__multicall__, pyfuncitem): if not __multicall__.execute(): testfunction = pyfuncitem.obj if pyfuncitem._isyieldedfunction(): testfunction(*pyfuncitem._args) else: funcargs = pyfuncitem.funcargs testfunction(**funcargs) def pytest_collect_file(path, parent): ext = path.ext pb = path.purebasename if ext == ".py": if not parent.session.isinitpath(path): for pat in parent.config.getini('python_files'): if path.fnmatch(pat): break else: return return parent.ihook.pytest_pycollect_makemodule( path=path, parent=parent) def pytest_pycollect_makemodule(path, parent): return Module(path, parent) def pytest_pycollect_makeitem(__multicall__, collector, name, obj): res = __multicall__.execute() if res is not None: return res if inspect.isclass(obj): #if hasattr(collector.obj, 'unittest'): # return # we assume it's a mixin class for a TestCase derived one if collector.classnamefilter(name): if not hasinit(obj): Class = collector._getcustomclass("Class") return Class(name, parent=collector) elif collector.funcnamefilter(name) and hasattr(obj, '__call__'): if is_generator(obj): return Generator(name, parent=collector) else: return collector._genfunctions(name, obj) def is_generator(func): try: return py.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 if hasattr(obj, 'compat_co_firstlineno'): # nose compatibility fspath = sys.modules[obj.__module__].__file__ if fspath.endswith(".pyc"): fspath = fspath[:-1] lineno = obj.compat_co_firstlineno modpath = obj.__module__ 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): for prefix in self.config.getini("python_functions"): if name.startswith(prefix): return True def classnamefilter(self, name): for prefix in self.config.getini("python_classes"): if name.startswith(prefix): return True def collect(self): # 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 dic.items(): if name in seen: continue seen[name] = True if name[0] != "_": 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): 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) metafunc = Metafunc(funcobj, parentid=self.nodeid, config=self.config, cls=cls, module=module) gentesthook = self.config.hook.pytest_generate_tests extra = [module] if cls is not None: extra.append(cls()) plugins = self.getplugins() + extra gentesthook.pcall(plugins, metafunc=metafunc) Function = self._getcustomclass("Function") l = [] if not metafunc._calls: l.append(Function(name, parent=self)) for callspec in metafunc._calls: subname = "%s[%s]" %(name, callspec.id) function = Function(name=subname, parent=self, callspec=callspec, callobj=funcobj, keywords={callspec.id:True}) l.append(function) return l 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: mark(funcobj) else: pytestmark(funcobj) 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.funcargmanager._parsefactories(self.obj, self.nodeid) return super(Module, self).collect() def _importtestmodule(self): # we assume we are only called once per module try: mod = self.fspath.pyimport(ensuresyspath=True) except SyntaxError: excinfo = py.code.ExceptionInfo() raise self.CollectError(excinfo.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): if hasattr(self.obj, 'setup_module'): #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 inspect.getargspec(self.obj.setup_module)[0]: self.obj.setup_module(self.obj) else: self.obj.setup_module() def teardown(self): if hasattr(self.obj, 'teardown_module'): #XXX: nose compat hack, move to nose plugin # if it takes a positional arg, its probably a py.test style one # so we pass the current module object if inspect.getargspec(self.obj.teardown_module)[0]: self.obj.teardown_module(self.obj) else: self.obj.teardown_module() class Class(PyCollector): """ Collector for test methods. """ def collect(self): return [self._getcustomclass("Instance")(name="()", parent=self)] def setup(self): setup_class = getattr(self.obj, 'setup_class', None) 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) def teardown(self): teardown_class = getattr(self.obj, 'teardown_class', None) if teardown_class is not None: teardown_class = getattr(teardown_class, 'im_func', teardown_class) teardown_class = getattr(teardown_class, '__func__', teardown_class) teardown_class(self.obj) class Instance(PyCollector): def _getobj(self): obj = self.parent.obj() return obj def collect(self): self.session.funcargmanager._parsefactories(self.obj, self.nodeid) 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): name = 'setup_method' else: name = 'setup_function' setup_func_or_method = getattr(obj, name, None) if setup_func_or_method is not None: setup_func_or_method(self.obj) def teardown(self): """ perform teardown for this test function. """ if inspect.ismethod(self.obj): name = 'teardown_method' else: name = 'teardown_function' obj = self.parent.obj teardown_func_or_meth = getattr(obj, name, None) if teardown_func_or_meth is not None: teardown_func_or_meth(self.obj) def _prunetraceback(self, excinfo): if hasattr(self, '_obj') and not self.config.option.fulltrace: code = py.code.Code(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=cutdir) excinfo.traceback = ntraceback.filter() 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" return self._repr_failure_py(excinfo, style=self.config.option.tbstyle) 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 py.builtin.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 fillfuncargs(function): """ fill missing funcargs. """ #if not getattr(function, "_args", None) is not None: # request = FuncargRequest(pyfuncitem=function) # request._fillfuncargs() if getattr(function, "_args", None) is None: try: request = function._request except AttributeError: request = function._request = FuncargRequest(function) request._fillfuncargs() _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 def copy(self, metafunc): cs = CallSpec2(self.metafunc) cs.funcargs.update(self.funcargs) cs.params.update(self.params) 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, valtype, argnames, valset, id, scopenum=0): for arg,val in zip(argnames, valset): self._checkargnotcontained(arg) getattr(self, valtype)[arg] = val self._arg2scopenum[arg] = scopenum self._idlist.append(id) 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 class Metafunc: def __init__(self, function, config=None, cls=None, module=None, parentid=""): self.config = config self.module = module self.function = function self.parentid = parentid self.funcargnames = getfuncargnames(function, startindex=int(cls is not None)) self.cls = cls self.module = module self._calls = [] self._ids = py.builtin.set() self._arg2scopenum = {} def parametrize(self, argnames, argvalues, indirect=False, ids=None, scope="function"): """ 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 you may pass indirect=True and implement a funcarg factory which can perform the expensive setup just before a test is actually run. :arg argnames: an argument name or a list of argument names :arg argvalues: a list of values for the argname or a list of tuples of values for the list of argument names. :arg indirect: if True each argvalue corresponding to an argument will be passed as request.param to its respective funcarg factory 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 each corresponding to the argvalues so that they are part of the test id. If no ids are provided they will be generated automatically from the argvalues. """ if not isinstance(argnames, (tuple, list)): argnames = (argnames,) argvalues = [(val,) for val in argvalues] if scope is None: scope = "function" scopenum = scopes.index(scope) if not indirect: #XXX should we also check for the opposite case? for arg in argnames: if arg not in self.funcargnames: raise ValueError("%r has no argument %r" %(self.function, arg)) valtype = indirect and "params" or "funcargs" if not ids: idmaker = IDMaker() ids = list(map(idmaker, argvalues)) newcalls = [] for callspec in self._calls or [CallSpec2(self)]: for i, valset in enumerate(argvalues): assert len(valset) == len(argnames) newcallspec = callspec.copy(self) newcallspec.setmulti(valtype, argnames, valset, ids[i], scopenum) newcalls.append(newcallspec) self._calls = newcalls 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 funcarg factory 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.funcargnames: 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) class IDMaker: def __init__(self): self.counter = 0 def __call__(self, valset): l = [] for val in valset: if not isinstance(val, (int, str)): val = "."+str(self.counter) self.counter += 1 l.append(str(val)) return "-".join(l) def showfuncargs(config): from _pytest.main import wrap_session return wrap_session(config, _showfuncargs_main) def _showfuncargs_main(config, session): session.perform_collect() if session.items: plugins = session.items[0].getplugins() else: plugins = session.getplugins() curdir = py.path.local() tw = py.io.TerminalWriter() verbose = config.getvalue("verbose") argprefix = session.funcargmanager._argprefix for plugin in plugins: available = [] for name, factory in vars(plugin).items(): if name.startswith(argprefix): name = name[len(argprefix):] if name not in available: available.append([name, factory]) if available: pluginname = plugin.__name__ for name, factory in available: loc = getlocation(factory, curdir) if verbose: funcargspec = "%s -- %s" %(name, loc,) else: funcargspec = name tw.line(funcargspec, green=True) doc = factory.__doc__ or "" if doc: for line in doc.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 def raises(ExpectedException, *args, **kwargs): """ assert that a code block/function call raises @ExpectedException and raise a failure exception otherwise. If using Python 2.5 or above, you may use this function as a context manager:: >>> with raises(ZeroDivisionError): ... 1/0 Or you can specify a callable by passing a to-be-called lambda:: >>> raises(ZeroDivisionError, lambda: 1/0) or you can specify an arbitrary callable with arguments:: >>> def f(x): return 1/x ... >>> raises(ZeroDivisionError, f, 0) >>> raises(ZeroDivisionError, f, x=0) A third possibility is to use a string to be executed:: >>> raises(ZeroDivisionError, "f(0)") """ __tracebackhide__ = True if not args: return RaisesContext(ExpectedException) 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 = py.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 ExpectedException: return py.code.ExceptionInfo() else: func = args[0] try: func(*args[1:], **kwargs) except ExpectedException: return py.code.ExceptionInfo() k = ", ".join(["%s=%r" % x for x in kwargs.items()]) if k: k = ', ' + k expr = '%s(%r%s)' %(getattr(func, '__name__', func), args, k) pytest.fail("DID NOT RAISE") class RaisesContext(object): def __init__(self, ExpectedException): self.ExpectedException = ExpectedException self.excinfo = None def __enter__(self): self.excinfo = object.__new__(py.code.ExceptionInfo) return self.excinfo def __exit__(self, *tp): __tracebackhide__ = True if tp[0] is None: pytest.fail("DID NOT RAISE") self.excinfo.__init__(tp) return issubclass(self.excinfo.type, self.ExpectedException) # # the basic py.test Function item # _dummy = object() class Function(FunctionMixin, pytest.Item): """ a Function Item is responsible for setting up and executing a Python test function. """ _genid = None def __init__(self, name, parent=None, args=None, config=None, callspec=None, callobj=_dummy, keywords=None, session=None): super(Function, self).__init__(name, parent, config=config, session=session) self._args = args if self._isyieldedfunction(): assert not callspec, ( "yielded functions (deprecated) cannot have funcargs") else: if callspec is not None: self.callspec = callspec self.funcargs = callspec.funcargs or {} self._genid = callspec.id if hasattr(callspec, "param"): self.param = callspec.param else: self.funcargs = {} self._request = req = FuncargRequest(self) #req._discoverfactories() if callobj is not _dummy: self.obj = callobj startindex = int(self.cls is not None) self.funcargnames = getfuncargnames(self.obj, startindex=startindex) self.keywords.update(py.builtin._getfuncdict(self.obj) or {}) if keywords: self.keywords.update(keywords) @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 def runtest(self): """ execute the underlying test function. """ self.ihook.pytest_pyfunc_call(pyfuncitem=self) def setup(self): super(Function, self).setup() fillfuncargs(self) if hasattr(self, "_request"): self._request._callsetup() def __eq__(self, other): try: return (self.name == other.name and self._args == other._args and self.parent == other.parent and self.obj == other.obj and getattr(self, '_genid', None) == getattr(other, '_genid', None) ) except AttributeError: pass return False def __ne__(self, other): return not self == other def __hash__(self): return hash((self.parent, self.name)) class FuncargRequest: """ A request for function arguments from a test function. Note that there is an optional ``param`` attribute in case there was an invocation to metafunc.addcall(param=...). If no such call was done in a ``pytest_generate_tests`` hook, the attribute will not be present. """ def __init__(self, pyfuncitem): self._pyfuncitem = pyfuncitem if hasattr(pyfuncitem, '_requestparam'): self.param = pyfuncitem._requestparam self.getparent = pyfuncitem.getparent self._funcargs = self._pyfuncitem.funcargs.copy() self._name2factory = {} self.funcargmanager = pyfuncitem.session.funcargmanager self._currentarg = None self.funcargnames = getfuncargnames(self.function) self.parentid = pyfuncitem.parent.nodeid self.scope = "function" self._factorystack = [] def _getfaclist(self, argname): facdeflist = self._name2factory.get(argname, None) if facdeflist is None: facdeflist = self.funcargmanager.getfactorylist( argname, self.parentid, self.function) self._name2factory[argname] = facdeflist elif not facdeflist: self.funcargmanager._raiselookupfailed(argname, self.function, self.parentid) return facdeflist def raiseerror(self, msg): """ raise a FuncargLookupError with the given message. """ raise self.funcargmanager.FuncargLookupError(self.function, msg) @property def function(self): """ function object of the test invocation. """ return self._pyfuncitem.obj @property def keywords(self): """ keywords of the test function item. .. versionadded:: 2.0 """ return self._pyfuncitem.keywords @property def module(self): """ module where the test function was collected. """ return self._pyfuncitem.getparent(pytest.Module).obj @property 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. """ return py.builtin._getimself(self.function) @property def config(self): """ the pytest config object associated with this request. """ return self._pyfuncitem.config @property def fspath(self): """ the file system path of the test module which collected this test. """ return self._pyfuncitem.fspath def _fillfuncargs(self): if self.funcargnames: assert not getattr(self._pyfuncitem, '_args', None), ( "yielded functions cannot have funcargs") while self.funcargnames: argname = self.funcargnames.pop(0) if argname not in self._pyfuncitem.funcargs: self._pyfuncitem.funcargs[argname] = \ self.getfuncargvalue(argname) 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 ``py.test.mark.NAME(...)``. """ if not isinstance(marker, py.test.mark.XYZ.__class__): raise ValueError("%r is not a py.test.mark.* object") self._pyfuncitem.keywords[marker.markname] = marker def cached_setup(self, setup, teardown=None, scope="module", extrakey=None): """ 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. :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._currentarg, self._getscopeitem(scope), extrakey) cache = self.config._setupcache try: val = cache[cachekey] except KeyError: __tracebackhide__ = True if scopemismatch(self.scope, scope): raise ScopeMismatchError("You tried to access a %r scoped " "resource with a %r scoped request object" %( (scope, self.scope))) __tracebackhide__ = False val = setup() cache[cachekey] = val if teardown is not None: def finalizer(): del cache[cachekey] teardown(val) self._addfinalizer(finalizer, scope=scope) return val def _callsetup(self): setuplist, allnames = self.funcargmanager.getsetuplist( self._pyfuncitem.nodeid) mp = monkeypatch() for setupcall in setuplist: kwargs = {} for name in setupcall.funcargnames: if name == "request": kwargs[name] = self else: kwargs[name] = self.getfuncargvalue(name) mp.setattr(self, 'scope', setupcall.scope) try: if setupcall.scope is None: setupcall.execute(kwargs) else: self.cached_setup(lambda: setupcall.execute(kwargs), scope=setupcall.scope) finally: mp.undo() def getfuncargvalue(self, argname): """ Retrieve a function argument by name for this test function invocation. This allows one function argument factory to call another function argument factory. If there are two funcarg factories for the same test function argument the first factory may use ``getfuncargvalue`` to call the second one and do something additional with the resource. """ try: return self._funcargs[argname] except KeyError: pass factorydeflist = self._getfaclist(argname) factorydef = factorydeflist.pop() self._factorystack.append(factorydef) try: return self._getfuncargvalue(factorydef) finally: self._factorystack.pop() def _getfuncargvalue(self, factorydef): # collect funcargs from the factory newnames = list(factorydef.funcargnames) newnames.remove("request") argname = factorydef.argname factory_kwargs = {"request": self} def fillfactoryargs(): for newname in newnames: factory_kwargs[newname] = self.getfuncargvalue(newname) node = self._pyfuncitem mp = monkeypatch() mp.setattr(self, '_currentarg', argname) try: param = node.callspec.getparam(argname) except (AttributeError, ValueError): pass else: mp.setattr(self, 'param', param, raising=False) scope = factorydef.scope funcargfactory = factorydef.func if scope is not None: __tracebackhide__ = True if scopemismatch(self.scope, scope): # try to report something helpful lines = [] for factorydef in self._factorystack: factory = factorydef.func fs, lineno = getfslineno(factory) p = self._pyfuncitem.session.fspath.bestrelpath(fs) args = inspect.formatargspec(*inspect.getargspec(factory)) lines.append("%s:%d\n def %s%s" %( p, lineno, factory.__name__, args)) raise ScopeMismatchError("You tried to access the %r scoped " "funcarg %r with a %r scoped request object, " "involved factories\n%s" %( (scope, argname, self.scope, "\n".join(lines)))) __tracebackhide__ = False mp.setattr(self, "scope", scope) kwargs = {} if hasattr(self, "param"): kwargs["extrakey"] = param fillfactoryargs() val = self.cached_setup(lambda: funcargfactory(**factory_kwargs), scope=scope, **kwargs) else: fillfactoryargs() val = funcargfactory(**factory_kwargs) mp.undo() self._funcargs[argname] = val return val def _getscopeitem(self, scope): if scope == "function": return self._pyfuncitem elif scope == "session": return None elif scope == "class": x = self._pyfuncitem.getparent(pytest.Class) if x is not None: return x scope = "module" if scope == "module": return self._pyfuncitem.getparent(pytest.Module) raise ValueError("unknown finalization scope %r" %(scope,)) def addfinalizer(self, finalizer): """add finalizer function to be called after test function finished execution. """ self._addfinalizer(finalizer, scope=self.scope) def _addfinalizer(self, finalizer, scope): if scope != "function" and hasattr(self, "param"): # parametrized resources are sorted by param # so we rather store finalizers per (argname, param) colitem = (self._currentarg, self.param) else: colitem = self._getscopeitem(scope) self._pyfuncitem.session._setupstate.addfinalizer( finalizer=finalizer, colitem=colitem) def __repr__(self): return "" %(self._pyfuncitem) class ScopeMismatchError(Exception): """ A funcarg factory tries to access a funcargvalue/factory which has a lower scope (e.g. a Session one calls a function one) """ scopes = "session module class function".split() def scopemismatch(currentscope, newscope): return scopes.index(newscope) > scopes.index(currentscope) def slice_kwargs(names, kwargs): new_kwargs = {} for name in names: new_kwargs[name] = kwargs[name] return new_kwargs