Source code for _pytest.main

""" core implementation of testing process: init, session, runtest loop. """
from __future__ import absolute_import, division, print_function

import contextlib
import functools
import os
import pkgutil
import six
import sys

import _pytest
from _pytest import nodes
import _pytest._code
import py

from _pytest.config import directory_arg, UsageError, hookimpl
from _pytest.outcomes import exit
from _pytest.runner import collect_one_node

# exitcodes for the command line

def pytest_addoption(parser):
    parser.addini("norecursedirs", "directory patterns to avoid for recursion",
                  type="args", default=['.*', 'build', 'dist', 'CVS', '_darcs', '{arch}', '*.egg', 'venv'])
    parser.addini("testpaths", "directories to search for tests when no files or directories are given in the "
                               "command line.",
                  type="args", default=[])
    # parser.addini("dirpatterns",
    #    "patterns specifying possible locations of test files",
    #    type="linelist", default=["**/test_*.txt",
    #            "**/test_*.py", "**/*"]
    # )
    group = parser.getgroup("general", "running and selection options")
    group._addoption('-x', '--exitfirst', action="store_const",
                     dest="maxfail", const=1,
                     help="exit instantly on first error or failed test."),
    group._addoption('--maxfail', metavar="num",
                     action="store", type=int, dest="maxfail", default=0,
                     help="exit after first num failures or errors.")
    group._addoption('--strict', action="store_true",
                     help="marks not registered in configuration file raise errors.")
    group._addoption("-c", metavar="file", type=str, dest="inifilename",
                     help="load configuration from `file` instead of trying to locate one of the implicit "
                          "configuration files.")
    group._addoption("--continue-on-collection-errors", action="store_true",
                     default=False, dest="continue_on_collection_errors",
                     help="Force test execution even if collection errors occur.")
    group._addoption("--rootdir", action="store",
                     help="Define root directory for tests. Can be relative path: 'root_dir', './root_dir', "
                          "'root_dir/another_dir/'; absolute path: '/home/user/root_dir'; path with variables: "

    group = parser.getgroup("collect", "collection")
    group.addoption('--collectonly', '--collect-only', action="store_true",
                    help="only collect tests, don't execute them."),
    group.addoption('--pyargs', action="store_true",
                    help="try to interpret all arguments as python packages.")
    group.addoption("--ignore", action="append", metavar="path",
                    help="ignore path during collection (multi-allowed).")
    group.addoption("--deselect", action="append", metavar="nodeid_prefix",
                    help="deselect item during collection (multi-allowed).")
    # when changing this to --conf-cut-dir, Conftest.setinitial
    # needs upgrading as well
    group.addoption('--confcutdir', dest="confcutdir", default=None,
                    metavar="dir", type=functools.partial(directory_arg, optname="--confcutdir"),
                    help="only load's relative to specified dir.")
    group.addoption('--noconftest', action="store_true",
                    dest="noconftest", default=False,
                    help="Don't load any files.")
    group.addoption('--keepduplicates', '--keep-duplicates', action="store_true",
                    dest="keepduplicates", default=False,
                    help="Keep duplicate tests.")
    group.addoption('--collect-in-virtualenv', action='store_true',
                    dest='collect_in_virtualenv', default=False,
                    help="Don't ignore tests in a local virtualenv directory")

    group = parser.getgroup("debugconfig",
                            "test session debugging and configuration")
    group.addoption('--basetemp', dest="basetemp", default=None, metavar="dir",
                    help="base temporary directory for this test run.")

def pytest_configure(config):
    __import__('pytest').config = config  # compatibility

def wrap_session(config, doit):
    """Skeleton command line program"""
    session = Session(config)
    session.exitstatus = EXIT_OK
    initstate = 0
            initstate = 1
            initstate = 2
            session.exitstatus = doit(config, session) or 0
        except UsageError:
        except Failed:
            session.exitstatus = EXIT_TESTSFAILED
        except KeyboardInterrupt:
            excinfo = _pytest._code.ExceptionInfo()
            if initstate < 2 and isinstance(excinfo.value, exit.Exception):
                sys.stderr.write('{0}: {1}\n'.format(
                    excinfo.typename, excinfo.value.msg))
            session.exitstatus = EXIT_INTERRUPTED
        except:  # noqa
            excinfo = _pytest._code.ExceptionInfo()
            config.notify_exception(excinfo, config.option)
            session.exitstatus = EXIT_INTERNALERROR
            if excinfo.errisinstance(SystemExit):
                sys.stderr.write("mainloop: caught Spurious SystemExit!\n")

        excinfo = None  # Explicitly break reference cycle.
        if initstate >= 2:
    return session.exitstatus

def pytest_cmdline_main(config):
    return wrap_session(config, _main)

def _main(config, session):
    """ default command line protocol for initialization, session,
    running tests and reporting. """

    if session.testsfailed:
        return EXIT_TESTSFAILED
    elif session.testscollected == 0:

def pytest_collection(session):
    return session.perform_collect()

def pytest_runtestloop(session):
    if (session.testsfailed and
            not session.config.option.continue_on_collection_errors):
        raise session.Interrupted(
            "%d errors during collection" % session.testsfailed)

    if session.config.option.collectonly:
        return True

    for i, item in enumerate(session.items):
        nextitem = session.items[i + 1] if i + 1 < len(session.items) else None
        item.config.hook.pytest_runtest_protocol(item=item, nextitem=nextitem)
        if session.shouldfail:
            raise session.Failed(session.shouldfail)
        if session.shouldstop:
            raise session.Interrupted(session.shouldstop)
    return True

def _in_venv(path):
    """Attempts to detect if ``path`` is the root of a Virtual Environment by
    checking for the existence of the appropriate activate script"""
    bindir = path.join('Scripts' if sys.platform.startswith('win') else 'bin')
    if not bindir.isdir():
        return False
    activates = ('activate', 'activate.csh', '',
                 'Activate', 'Activate.bat', 'Activate.ps1')
    return any([fname.basename in activates for fname in bindir.listdir()])

def pytest_ignore_collect(path, config):
    ignore_paths = config._getconftest_pathlist("collect_ignore", path=path.dirpath())
    ignore_paths = ignore_paths or []
    excludeopt = config.getoption("ignore")
    if excludeopt:
        ignore_paths.extend([py.path.local(x) for x in excludeopt])

    if py.path.local(path) in ignore_paths:
        return True

    allow_in_venv = config.getoption("collect_in_virtualenv")
    if _in_venv(path) and not allow_in_venv:
        return True

    # Skip duplicate paths.
    keepduplicates = config.getoption("keepduplicates")
    duplicate_paths = config.pluginmanager._duplicatepaths
    if not keepduplicates:
        if path in duplicate_paths:
            return True

    return False

def pytest_collection_modifyitems(items, config):
    deselect_prefixes = tuple(config.getoption("deselect") or [])
    if not deselect_prefixes:

    remaining = []
    deselected = []
    for colitem in items:
        if colitem.nodeid.startswith(deselect_prefixes):

    if deselected:
        items[:] = remaining

def _patched_find_module():
    """Patch bug in pkgutil.ImpImporter.find_module

    When using pkgutil.find_loader on python<3.4 it removes symlinks
    from the path due to a call to os.path.realpath. This is not consistent
    with actually doing the import (in these versions, pkgutil and __import__
    did not share the same underlying code). This can break conftest
    discovery for pytest where symlinks are involved.

    The only supported python<3.4 by pytest is python 2.7.
    if six.PY2:  # python 3.4+ uses importlib instead
        def find_module_patched(self, fullname, path=None):
            # Note: we ignore 'path' argument since it is only used via meta_path
            subname = fullname.split(".")[-1]
            if subname != fullname and self.path is None:
                return None
            if self.path is None:
                path = None
                # original: path = [os.path.realpath(self.path)]
                path = [self.path]
                file, filename, etc = pkgutil.imp.find_module(subname,
            except ImportError:
                return None
            return pkgutil.ImpLoader(fullname, file, filename, etc)

        old_find_module = pkgutil.ImpImporter.find_module
        pkgutil.ImpImporter.find_module = find_module_patched
            pkgutil.ImpImporter.find_module = old_find_module

class FSHookProxy(object):
    def __init__(self, fspath, pm, remove_mods):
        self.fspath = fspath = pm
        self.remove_mods = remove_mods

    def __getattr__(self, name):
        x =, remove_plugins=self.remove_mods)
        self.__dict__[name] = x
        return x

class NoMatch(Exception):
    """ raised if matching cannot locate a matching names. """

class Interrupted(KeyboardInterrupt):
    """ signals an interrupted test run. """
    __module__ = 'builtins'  # for py3

class Failed(Exception):
    """ signals a stop as failed test run. """

[docs]class Session(nodes.FSCollector): Interrupted = Interrupted Failed = Failed def __init__(self, config): nodes.FSCollector.__init__( self, config.rootdir, parent=None, config=config, session=self, nodeid="") self.testsfailed = 0 self.testscollected = 0 self.shouldstop = False self.shouldfail = False self.trace = config.trace.root.get("collection") self._norecursepatterns = config.getini("norecursedirs") self.startdir = py.path.local() self.config.pluginmanager.register(self, name="session") @hookimpl(tryfirst=True) def pytest_collectstart(self): if self.shouldfail: raise self.Failed(self.shouldfail) if self.shouldstop: raise self.Interrupted(self.shouldstop) @hookimpl(tryfirst=True) def pytest_runtest_logreport(self, report): if report.failed and not hasattr(report, 'wasxfail'): self.testsfailed += 1 maxfail = self.config.getvalue("maxfail") if maxfail and self.testsfailed >= maxfail: self.shouldfail = "stopping after %d failures" % ( self.testsfailed) pytest_collectreport = pytest_runtest_logreport def isinitpath(self, path): return path in self._initialpaths def gethookproxy(self, fspath): # check if we have the common case of running # hooks with all files pm = self.config.pluginmanager my_conftestmodules = pm._getconftestmodules(fspath) remove_mods = pm._conftest_plugins.difference(my_conftestmodules) if remove_mods: # one or more conftests are not in use at this fspath proxy = FSHookProxy(fspath, pm, remove_mods) else: # all plugis are active for this fspath proxy = self.config.hook return proxy def perform_collect(self, args=None, genitems=True): hook = self.config.hook try: items = self._perform_collect(args, genitems) self.config.pluginmanager.check_pending() hook.pytest_collection_modifyitems(session=self, config=self.config, items=items) finally: hook.pytest_collection_finish(session=self) self.testscollected = len(items) return items def _perform_collect(self, args, genitems): if args is None: args = self.config.args self.trace("perform_collect", self, args) self.trace.root.indent += 1 self._notfound = [] self._initialpaths = set() self._initialparts = [] self.items = items = [] for arg in args: parts = self._parsearg(arg) self._initialparts.append(parts) self._initialpaths.add(parts[0]) rep = collect_one_node(self) self.ihook.pytest_collectreport(report=rep) self.trace.root.indent -= 1 if self._notfound: errors = [] for arg, exc in self._notfound: line = "(no name %r in any of %r)" % (arg, exc.args[0]) errors.append("not found: %s\n%s" % (arg, line)) # XXX: test this raise UsageError(*errors) if not genitems: return rep.result else: if rep.passed: for node in rep.result: self.items.extend(self.genitems(node)) return items def collect(self): for parts in self._initialparts: arg = "::".join(map(str, parts)) self.trace("processing argument", arg) self.trace.root.indent += 1 try: for x in self._collect(arg): yield x except NoMatch: # we are inside a make_report hook so # we cannot directly pass through the exception self._notfound.append((arg, sys.exc_info()[1])) self.trace.root.indent -= 1 def _collect(self, arg): names = self._parsearg(arg) path = names.pop(0) if path.check(dir=1): assert not names, "invalid arg %r" % (arg,) for path in path.visit(fil=lambda x: x.check(file=1), rec=self._recurse, bf=True, sort=True): for x in self._collectfile(path): yield x else: assert path.check(file=1) for x in self.matchnodes(self._collectfile(path), names): yield x def _collectfile(self, path): ihook = self.gethookproxy(path) if not self.isinitpath(path): if ihook.pytest_ignore_collect(path=path, config=self.config): return () return ihook.pytest_collect_file(path=path, parent=self) def _recurse(self, path): ihook = self.gethookproxy(path.dirpath()) if ihook.pytest_ignore_collect(path=path, config=self.config): return for pat in self._norecursepatterns: if path.check(fnmatch=pat): return False ihook = self.gethookproxy(path) ihook.pytest_collect_directory(path=path, parent=self) return True def _tryconvertpyarg(self, x): """Convert a dotted module name to path. """ try: with _patched_find_module(): loader = pkgutil.find_loader(x) except ImportError: return x if loader is None: return x # This method is sometimes invoked when AssertionRewritingHook, which # does not define a get_filename method, is already in place: try: with _patched_find_module(): path = loader.get_filename(x) except AttributeError: # Retrieve path from AssertionRewritingHook: path = loader.modules[x][0].co_filename if loader.is_package(x): path = os.path.dirname(path) return path def _parsearg(self, arg): """ return (fspath, names) tuple after checking the file exists. """ parts = str(arg).split("::") if self.config.option.pyargs: parts[0] = self._tryconvertpyarg(parts[0]) relpath = parts[0].replace("/", os.sep) path = self.config.invocation_dir.join(relpath, abs=True) if not path.check(): if self.config.option.pyargs: raise UsageError( "file or package not found: " + arg + " (missing") else: raise UsageError("file not found: " + arg) parts[0] = path return parts def matchnodes(self, matching, names): self.trace("matchnodes", matching, names) self.trace.root.indent += 1 nodes = self._matchnodes(matching, names) num = len(nodes) self.trace("matchnodes finished -> ", num, "nodes") self.trace.root.indent -= 1 if num == 0: raise NoMatch(matching, names[:1]) return nodes def _matchnodes(self, matching, names): if not matching or not names: return matching name = names[0] assert name nextnames = names[1:] resultnodes = [] for node in matching: if isinstance(node, nodes.Item): if not names: resultnodes.append(node) continue assert isinstance(node, nodes.Collector) rep = collect_one_node(node) if rep.passed: has_matched = False for x in rep.result: # TODO: remove parametrized workaround once collection structure contains parametrization if == name or"[")[0] == name: resultnodes.extend(self.matchnodes([x], nextnames)) has_matched = True # XXX accept IDs that don't have "()" for class instances if not has_matched and len(rep.result) == 1 and == "()": nextnames.insert(0, name) resultnodes.extend(self.matchnodes([x], nextnames)) else: # report collection failures here to avoid failing to run some test # specified in the command line because the module could not be # imported (#134) node.ihook.pytest_collectreport(report=rep) return resultnodes def genitems(self, node): self.trace("genitems", node) if isinstance(node, nodes.Item): node.ihook.pytest_itemcollected(item=node) yield node else: assert isinstance(node, nodes.Collector) rep = collect_one_node(node) if rep.passed: for subnode in rep.result: for x in self.genitems(subnode): yield x node.ihook.pytest_collectreport(report=rep)