852 lines
30 KiB
Python
852 lines
30 KiB
Python
""" Python test discovery, setup and run of test functions. """
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import py
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import inspect
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import sys
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import pytest
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from py._code.code import TerminalRepr
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import _pytest
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cutdir = py.path.local(_pytest.__file__).dirpath()
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def pytest_addoption(parser):
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group = parser.getgroup("general")
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group.addoption('--funcargs',
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action="store_true", dest="showfuncargs", default=False,
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help="show available function arguments, sorted by plugin")
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parser.addini("python_files", type="args",
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default=('test_*.py', '*_test.py'),
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help="glob-style file patterns for Python test module discovery")
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parser.addini("python_classes", type="args", default=("Test",),
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help="prefixes for Python test class discovery")
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parser.addini("python_functions", type="args", default=("test",),
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help="prefixes for Python test function and method discovery")
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def pytest_cmdline_main(config):
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if config.option.showfuncargs:
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showfuncargs(config)
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return 0
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@pytest.mark.trylast
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def pytest_namespace():
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raises.Exception = pytest.fail.Exception
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return {
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'raises' : raises,
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'collect': {
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'Module': Module, 'Class': Class, 'Instance': Instance,
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'Function': Function, 'Generator': Generator,
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'_fillfuncargs': fillfuncargs}
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}
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def pytest_funcarg__pytestconfig(request):
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""" the pytest config object with access to command line opts."""
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return request.config
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def pytest_pyfunc_call(__multicall__, pyfuncitem):
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if not __multicall__.execute():
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testfunction = pyfuncitem.obj
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if pyfuncitem._isyieldedfunction():
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testfunction(*pyfuncitem._args)
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else:
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funcargs = pyfuncitem.funcargs
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testfunction(**funcargs)
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def pytest_collect_file(path, parent):
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ext = path.ext
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pb = path.purebasename
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if ext == ".py":
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if not parent.session.isinitpath(path):
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for pat in parent.config.getini('python_files'):
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if path.fnmatch(pat):
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break
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else:
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return
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return parent.ihook.pytest_pycollect_makemodule(
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path=path, parent=parent)
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def pytest_pycollect_makemodule(path, parent):
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return Module(path, parent)
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def pytest_pycollect_makeitem(__multicall__, collector, name, obj):
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res = __multicall__.execute()
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if res is not None:
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return res
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if collector._istestclasscandidate(name, obj):
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#if hasattr(collector.obj, 'unittest'):
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# return # we assume it's a mixin class for a TestCase derived one
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return Class(name, parent=collector)
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elif collector.funcnamefilter(name) and hasattr(obj, '__call__'):
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if is_generator(obj):
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return Generator(name, parent=collector)
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else:
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return collector._genfunctions(name, obj)
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def is_generator(func):
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try:
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return py.code.getrawcode(func).co_flags & 32 # generator function
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except AttributeError: # builtin functions have no bytecode
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# assume them to not be generators
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return False
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class PyobjMixin(object):
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def obj():
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def fget(self):
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try:
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return self._obj
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except AttributeError:
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self._obj = obj = self._getobj()
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return obj
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def fset(self, value):
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self._obj = value
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return property(fget, fset, None, "underlying python object")
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obj = obj()
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def _getobj(self):
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return getattr(self.parent.obj, self.name)
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def getmodpath(self, stopatmodule=True, includemodule=False):
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""" return python path relative to the containing module. """
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chain = self.listchain()
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chain.reverse()
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parts = []
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for node in chain:
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if isinstance(node, Instance):
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continue
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name = node.name
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if isinstance(node, Module):
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assert name.endswith(".py")
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name = name[:-3]
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if stopatmodule:
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if includemodule:
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parts.append(name)
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break
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parts.append(name)
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parts.reverse()
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s = ".".join(parts)
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return s.replace(".[", "[")
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def _getfslineno(self):
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try:
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return self._fslineno
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except AttributeError:
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pass
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obj = self.obj
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# xxx let decorators etc specify a sane ordering
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if hasattr(obj, 'place_as'):
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obj = obj.place_as
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self._fslineno = py.code.getfslineno(obj)
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return self._fslineno
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def reportinfo(self):
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# XXX caching?
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obj = self.obj
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if hasattr(obj, 'compat_co_firstlineno'):
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# nose compatibility
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fspath = sys.modules[obj.__module__].__file__
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if fspath.endswith(".pyc"):
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fspath = fspath[:-1]
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#assert 0
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#fn = inspect.getsourcefile(obj) or inspect.getfile(obj)
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lineno = obj.compat_co_firstlineno
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modpath = obj.__module__
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else:
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fspath, lineno = self._getfslineno()
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modpath = self.getmodpath()
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return fspath, lineno, modpath
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class PyCollectorMixin(PyobjMixin, pytest.Collector):
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def funcnamefilter(self, name):
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for prefix in self.config.getini("python_functions"):
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if name.startswith(prefix):
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return True
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def classnamefilter(self, name):
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for prefix in self.config.getini("python_classes"):
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if name.startswith(prefix):
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return True
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def collect(self):
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# NB. we avoid random getattrs and peek in the __dict__ instead
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# (XXX originally introduced from a PyPy need, still true?)
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dicts = [getattr(self.obj, '__dict__', {})]
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for basecls in inspect.getmro(self.obj.__class__):
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dicts.append(basecls.__dict__)
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seen = {}
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l = []
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for dic in dicts:
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for name, obj in dic.items():
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if name in seen:
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continue
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seen[name] = True
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if name[0] != "_":
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res = self.makeitem(name, obj)
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if res is None:
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continue
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if not isinstance(res, list):
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res = [res]
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l.extend(res)
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l.sort(key=lambda item: item.reportinfo()[:2])
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return l
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def makeitem(self, name, obj):
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return self.ihook.pytest_pycollect_makeitem(
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collector=self, name=name, obj=obj)
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def _istestclasscandidate(self, name, obj):
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if self.classnamefilter(name) and \
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inspect.isclass(obj):
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if hasinit(obj):
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# XXX WARN
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return False
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return True
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def _genfunctions(self, name, funcobj):
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module = self.getparent(Module).obj
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clscol = self.getparent(Class)
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cls = clscol and clscol.obj or None
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metafunc = Metafunc(funcobj, config=self.config,
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cls=cls, module=module)
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gentesthook = self.config.hook.pytest_generate_tests
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extra = [module]
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if cls is not None:
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extra.append(cls())
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plugins = self.getplugins() + extra
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gentesthook.pcall(plugins, metafunc=metafunc)
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if not metafunc._calls:
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return Function(name, parent=self)
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l = []
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for callspec in metafunc._calls:
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subname = "%s[%s]" %(name, callspec.id)
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function = Function(name=subname, parent=self,
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callspec=callspec, callobj=funcobj, keywords={callspec.id:True})
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l.append(function)
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return l
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class Module(pytest.File, PyCollectorMixin):
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def _getobj(self):
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return self._memoizedcall('_obj', self._importtestmodule)
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def _importtestmodule(self):
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# we assume we are only called once per module
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try:
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mod = self.fspath.pyimport(ensuresyspath=True)
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except SyntaxError:
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excinfo = py.code.ExceptionInfo()
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raise self.CollectError(excinfo.getrepr(style="short"))
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except self.fspath.ImportMismatchError:
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e = sys.exc_info()[1]
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raise self.CollectError(
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"import file mismatch:\n"
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"imported module %r has this __file__ attribute:\n"
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" %s\n"
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"which is not the same as the test file we want to collect:\n"
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" %s\n"
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"HINT: use a unique basename for your test file modules"
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% e.args
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)
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#print "imported test module", mod
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self.config.pluginmanager.consider_module(mod)
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return mod
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def setup(self):
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if hasattr(self.obj, 'setup_module'):
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#XXX: nose compat hack, move to nose plugin
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# if it takes a positional arg, its probably a pytest style one
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# so we pass the current module object
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if inspect.getargspec(self.obj.setup_module)[0]:
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self.obj.setup_module(self.obj)
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else:
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self.obj.setup_module()
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def teardown(self):
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if hasattr(self.obj, 'teardown_module'):
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#XXX: nose compat hack, move to nose plugin
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# if it takes a positional arg, its probably a py.test style one
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# so we pass the current module object
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if inspect.getargspec(self.obj.teardown_module)[0]:
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self.obj.teardown_module(self.obj)
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else:
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self.obj.teardown_module()
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class Class(PyCollectorMixin, pytest.Collector):
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def collect(self):
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return [Instance(name="()", parent=self)]
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def setup(self):
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setup_class = getattr(self.obj, 'setup_class', None)
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if setup_class is not None:
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setup_class = getattr(setup_class, 'im_func', setup_class)
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setup_class(self.obj)
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def teardown(self):
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teardown_class = getattr(self.obj, 'teardown_class', None)
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if teardown_class is not None:
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teardown_class = getattr(teardown_class, 'im_func', teardown_class)
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teardown_class(self.obj)
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class Instance(PyCollectorMixin, pytest.Collector):
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def _getobj(self):
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return self.parent.obj()
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def newinstance(self):
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self.obj = self._getobj()
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return self.obj
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class FunctionMixin(PyobjMixin):
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""" mixin for the code common to Function and Generator.
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"""
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def setup(self):
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""" perform setup for this test function. """
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if inspect.ismethod(self.obj):
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name = 'setup_method'
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else:
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name = 'setup_function'
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if isinstance(self.parent, Instance):
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obj = self.parent.newinstance()
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self.obj = self._getobj()
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else:
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obj = self.parent.obj
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setup_func_or_method = getattr(obj, name, None)
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if setup_func_or_method is not None:
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setup_func_or_method(self.obj)
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def teardown(self):
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""" perform teardown for this test function. """
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if inspect.ismethod(self.obj):
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name = 'teardown_method'
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else:
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name = 'teardown_function'
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obj = self.parent.obj
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teardown_func_or_meth = getattr(obj, name, None)
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if teardown_func_or_meth is not None:
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teardown_func_or_meth(self.obj)
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def _prunetraceback(self, excinfo):
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if hasattr(self, '_obj') and not self.config.option.fulltrace:
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code = py.code.Code(self.obj)
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path, firstlineno = code.path, code.firstlineno
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traceback = excinfo.traceback
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ntraceback = traceback.cut(path=path, firstlineno=firstlineno)
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if ntraceback == traceback:
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ntraceback = ntraceback.cut(path=path)
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if ntraceback == traceback:
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ntraceback = ntraceback.cut(excludepath=cutdir)
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excinfo.traceback = ntraceback.filter()
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def _repr_failure_py(self, excinfo, style="long"):
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if excinfo.errisinstance(FuncargRequest.LookupError):
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fspath, lineno, msg = self.reportinfo()
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lines, _ = inspect.getsourcelines(self.obj)
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for i, line in enumerate(lines):
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if line.strip().startswith('def'):
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return FuncargLookupErrorRepr(fspath, lineno,
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lines[:i+1], str(excinfo.value))
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if excinfo.errisinstance(pytest.fail.Exception):
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if not excinfo.value.pytrace:
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return str(excinfo.value)
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return super(FunctionMixin, self)._repr_failure_py(excinfo,
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style=style)
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def repr_failure(self, excinfo, outerr=None):
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assert outerr is None, "XXX outerr usage is deprecated"
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return self._repr_failure_py(excinfo,
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style=self.config.option.tbstyle)
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class FuncargLookupErrorRepr(TerminalRepr):
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def __init__(self, filename, firstlineno, deflines, errorstring):
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self.deflines = deflines
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self.errorstring = errorstring
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self.filename = filename
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self.firstlineno = firstlineno
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def toterminal(self, tw):
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tw.line()
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for line in self.deflines:
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tw.line(" " + line.strip())
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for line in self.errorstring.split("\n"):
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tw.line(" " + line.strip(), red=True)
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tw.line()
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tw.line("%s:%d" % (self.filename, self.firstlineno+1))
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class Generator(FunctionMixin, PyCollectorMixin, pytest.Collector):
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def collect(self):
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# test generators are seen as collectors but they also
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# invoke setup/teardown on popular request
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# (induced by the common "test_*" naming shared with normal tests)
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self.config._setupstate.prepare(self)
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l = []
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seen = {}
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for i, x in enumerate(self.obj()):
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name, call, args = self.getcallargs(x)
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if not py.builtin.callable(call):
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raise TypeError("%r yielded non callable test %r" %(self.obj, call,))
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if name is None:
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name = "[%d]" % i
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else:
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name = "['%s']" % name
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if name in seen:
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raise ValueError("%r generated tests with non-unique name %r" %(self, name))
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seen[name] = True
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l.append(Function(name, self, args=args, callobj=call))
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return l
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def getcallargs(self, obj):
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if not isinstance(obj, (tuple, list)):
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obj = (obj,)
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# explict naming
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if isinstance(obj[0], py.builtin._basestring):
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name = obj[0]
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obj = obj[1:]
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else:
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name = None
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call, args = obj[0], obj[1:]
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return name, call, args
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#
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# Test Items
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#
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_dummy = object()
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class Function(FunctionMixin, pytest.Item):
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""" a Function Item is responsible for setting up
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and executing a Python callable test object.
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"""
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_genid = None
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def __init__(self, name, parent=None, args=None, config=None,
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callspec=None, callobj=_dummy, keywords=None, session=None):
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super(Function, self).__init__(name, parent,
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config=config, session=session)
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self._args = args
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if self._isyieldedfunction():
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assert not callspec, (
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"yielded functions (deprecated) cannot have funcargs")
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else:
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if callspec is not None:
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self.funcargs = callspec.funcargs or {}
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self._genid = callspec.id
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if hasattr(callspec, "param"):
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self._requestparam = callspec.param
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else:
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self.funcargs = {}
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if callobj is not _dummy:
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self._obj = callobj
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self.function = getattr(self.obj, 'im_func', self.obj)
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self.keywords.update(py.builtin._getfuncdict(self.obj) or {})
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if keywords:
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self.keywords.update(keywords)
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def _getobj(self):
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name = self.name
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i = name.find("[") # parametrization
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if i != -1:
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name = name[:i]
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return getattr(self.parent.obj, name)
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def _isyieldedfunction(self):
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return self._args is not None
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def runtest(self):
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""" execute the underlying test function. """
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self.ihook.pytest_pyfunc_call(pyfuncitem=self)
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def setup(self):
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super(Function, self).setup()
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if hasattr(self, 'funcargs'):
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fillfuncargs(self)
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def __eq__(self, other):
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try:
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return (self.name == other.name and
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self._args == other._args and
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self.parent == other.parent and
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self.obj == other.obj and
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getattr(self, '_genid', None) ==
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getattr(other, '_genid', None)
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)
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except AttributeError:
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pass
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return False
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def __ne__(self, other):
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return not self == other
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def __hash__(self):
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return hash((self.parent, self.name))
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def hasinit(obj):
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init = getattr(obj, '__init__', None)
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if init:
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if init != object.__init__:
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return True
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def getfuncargnames(function):
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# XXX merge with main.py's varnames
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argnames = py.std.inspect.getargs(py.code.getrawcode(function))[0]
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startindex = py.std.inspect.ismethod(function) and 1 or 0
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defaults = getattr(function, 'func_defaults',
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getattr(function, '__defaults__', None)) or ()
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numdefaults = len(defaults)
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if numdefaults:
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return argnames[startindex:-numdefaults]
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return argnames[startindex:]
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def fillfuncargs(function):
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""" fill missing funcargs. """
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request = FuncargRequest(pyfuncitem=function)
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request._fillfuncargs()
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_notexists = object()
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class CallSpec:
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def __init__(self, funcargs, id, param):
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self.funcargs = funcargs
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self.id = id
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if param is not _notexists:
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self.param = param
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def __repr__(self):
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|
return "<CallSpec id=%r param=%r funcargs=%r>" %(
|
|
self.id, getattr(self, 'param', '?'), self.funcargs)
|
|
|
|
class Metafunc:
|
|
def __init__(self, function, config=None, cls=None, module=None):
|
|
self.config = config
|
|
self.module = module
|
|
self.function = function
|
|
self.funcargnames = getfuncargnames(function)
|
|
self.cls = cls
|
|
self.module = module
|
|
self._calls = []
|
|
self._ids = py.builtin.set()
|
|
|
|
def addcall(self, funcargs=None, id=_notexists, param=_notexists):
|
|
""" add a new call to the underlying test function during the
|
|
collection phase of a test run.
|
|
|
|
: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` the length of the currently
|
|
list of calls to the test function will be used.
|
|
|
|
:arg param: will be exposed to a later funcarg factory invocation
|
|
through the ``request.param`` attribute. Setting it (instead of
|
|
directly providing a ``funcargs`` ditionary) is called
|
|
*indirect parametrization*. Indirect parametrization is
|
|
preferable if test values are expensive to setup or can
|
|
only be created after certain fixtures or test-run related
|
|
initialization code has been run.
|
|
"""
|
|
assert funcargs is None or isinstance(funcargs, dict)
|
|
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)
|
|
self._calls.append(CallSpec(funcargs, id, param))
|
|
|
|
class FuncargRequest:
|
|
""" A request for function arguments from a test function. """
|
|
_argprefix = "pytest_funcarg__"
|
|
_argname = None
|
|
|
|
class LookupError(LookupError):
|
|
""" error on performing funcarg request. """
|
|
|
|
def __init__(self, pyfuncitem):
|
|
self._pyfuncitem = pyfuncitem
|
|
if hasattr(pyfuncitem, '_requestparam'):
|
|
self.param = pyfuncitem._requestparam
|
|
extra = [obj for obj in (self.module, self.instance) if obj]
|
|
self._plugins = pyfuncitem.getplugins() + extra
|
|
self._funcargs = self._pyfuncitem.funcargs.copy()
|
|
self._name2factory = {}
|
|
self._currentarg = None
|
|
|
|
@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):
|
|
argnames = getfuncargnames(self.function)
|
|
if argnames:
|
|
assert not getattr(self._pyfuncitem, '_args', None), (
|
|
"yielded functions cannot have funcargs")
|
|
for argname in argnames:
|
|
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:
|
|
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 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
|
|
if argname not in self._name2factory:
|
|
self._name2factory[argname] = self.config.pluginmanager.listattr(
|
|
plugins=self._plugins,
|
|
attrname=self._argprefix + str(argname)
|
|
)
|
|
#else: we are called recursively
|
|
if not self._name2factory[argname]:
|
|
self._raiselookupfailed(argname)
|
|
funcargfactory = self._name2factory[argname].pop()
|
|
oldarg = self._currentarg
|
|
self._currentarg = argname
|
|
try:
|
|
self._funcargs[argname] = res = funcargfactory(request=self)
|
|
finally:
|
|
self._currentarg = oldarg
|
|
return res
|
|
|
|
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="function")
|
|
|
|
def _addfinalizer(self, finalizer, scope):
|
|
colitem = self._getscopeitem(scope)
|
|
self.config._setupstate.addfinalizer(
|
|
finalizer=finalizer, colitem=colitem)
|
|
|
|
def __repr__(self):
|
|
return "<FuncargRequest for %r>" %(self._pyfuncitem)
|
|
|
|
def _raiselookupfailed(self, argname):
|
|
available = []
|
|
for plugin in self._plugins:
|
|
for name in vars(plugin):
|
|
if name.startswith(self._argprefix):
|
|
name = name[len(self._argprefix):]
|
|
if name not in available:
|
|
available.append(name)
|
|
fspath, lineno, msg = self._pyfuncitem.reportinfo()
|
|
msg = "LookupError: no factory found for function argument %r" % (argname,)
|
|
msg += "\n available funcargs: %s" %(", ".join(available),)
|
|
msg += "\n use 'py.test --funcargs [testpath]' for help on them."
|
|
raise self.LookupError(msg)
|
|
|
|
def showfuncargs(config):
|
|
from _pytest.session import Session
|
|
session = Session(config)
|
|
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")
|
|
for plugin in plugins:
|
|
available = []
|
|
for name, factory in vars(plugin).items():
|
|
if name.startswith(FuncargRequest._argprefix):
|
|
name = name[len(FuncargRequest._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)
|
|
<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 which which will
|
|
be executed::
|
|
|
|
>>> raises(ZeroDivisionError, "f(0)")
|
|
<ExceptionInfo ...>
|
|
"""
|
|
__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)
|