249 lines
8.2 KiB
Python
249 lines
8.2 KiB
Python
""" per-test stdout/stderr capturing mechanisms, ``capsys`` and ``capfd`` function arguments. """
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import pytest, py
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import sys
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import os
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def pytest_addoption(parser):
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group = parser.getgroup("general")
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group._addoption('--capture', action="store", default=None,
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metavar="method", choices=['fd', 'sys', 'no'],
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help="per-test capturing method: one of fd (default)|sys|no.")
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group._addoption('-s', action="store_const", const="no", dest="capture",
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help="shortcut for --capture=no.")
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@pytest.mark.tryfirst
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def pytest_load_initial_conftests(early_config, parser, args, __multicall__):
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ns = parser.parse_known_args(args)
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method = ns.capture
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if not method:
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method = "fd"
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if method == "fd" and not hasattr(os, "dup"):
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method = "sys"
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capman = CaptureManager(method)
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early_config.pluginmanager.register(capman, "capturemanager")
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# make sure that capturemanager is properly reset at final shutdown
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def teardown():
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try:
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capman.reset_capturings()
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except ValueError:
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pass
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early_config.pluginmanager.add_shutdown(teardown)
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# make sure logging does not raise exceptions if it is imported
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def silence_logging_at_shutdown():
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if "logging" in sys.modules:
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sys.modules["logging"].raiseExceptions = False
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early_config.pluginmanager.add_shutdown(silence_logging_at_shutdown)
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# finally trigger conftest loading but while capturing (issue93)
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capman.resumecapture()
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try:
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try:
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return __multicall__.execute()
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finally:
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out, err = capman.suspendcapture()
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except:
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sys.stdout.write(out)
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sys.stderr.write(err)
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raise
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def addouterr(rep, outerr):
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for secname, content in zip(["out", "err"], outerr):
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if content:
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rep.sections.append(("Captured std%s" % secname, content))
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class NoCapture:
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def startall(self):
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pass
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def resume(self):
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pass
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def reset(self):
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pass
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def suspend(self):
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return "", ""
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class CaptureManager:
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def __init__(self, defaultmethod=None):
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self._method2capture = {}
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self._defaultmethod = defaultmethod
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def _maketempfile(self):
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f = py.std.tempfile.TemporaryFile()
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newf = py.io.dupfile(f, encoding="UTF-8")
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f.close()
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return newf
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def _makestringio(self):
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return py.io.TextIO()
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def _getcapture(self, method):
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if method == "fd":
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return py.io.StdCaptureFD(now=False,
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out=self._maketempfile(), err=self._maketempfile()
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)
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elif method == "sys":
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return py.io.StdCapture(now=False,
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out=self._makestringio(), err=self._makestringio()
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)
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elif method == "no":
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return NoCapture()
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else:
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raise ValueError("unknown capturing method: %r" % method)
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def _getmethod(self, config, fspath):
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if config.option.capture:
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method = config.option.capture
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else:
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try:
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method = config._conftest.rget("option_capture", path=fspath)
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except KeyError:
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method = "fd"
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if method == "fd" and not hasattr(os, 'dup'): # e.g. jython
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method = "sys"
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return method
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def reset_capturings(self):
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for name, cap in self._method2capture.items():
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cap.reset()
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def resumecapture_item(self, item):
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method = self._getmethod(item.config, item.fspath)
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if not hasattr(item, 'outerr'):
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item.outerr = ('', '') # we accumulate outerr on the item
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return self.resumecapture(method)
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def resumecapture(self, method=None):
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if hasattr(self, '_capturing'):
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raise ValueError("cannot resume, already capturing with %r" %
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(self._capturing,))
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if method is None:
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method = self._defaultmethod
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cap = self._method2capture.get(method)
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self._capturing = method
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if cap is None:
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self._method2capture[method] = cap = self._getcapture(method)
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cap.startall()
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else:
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cap.resume()
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def suspendcapture(self, item=None):
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self.deactivate_funcargs()
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if hasattr(self, '_capturing'):
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method = self._capturing
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cap = self._method2capture.get(method)
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if cap is not None:
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outerr = cap.suspend()
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del self._capturing
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if item:
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outerr = (item.outerr[0] + outerr[0],
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item.outerr[1] + outerr[1])
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return outerr
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if hasattr(item, 'outerr'):
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return item.outerr
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return "", ""
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def activate_funcargs(self, pyfuncitem):
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funcargs = getattr(pyfuncitem, "funcargs", None)
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if funcargs is not None:
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for name, capfuncarg in funcargs.items():
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if name in ('capsys', 'capfd'):
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assert not hasattr(self, '_capturing_funcarg')
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self._capturing_funcarg = capfuncarg
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capfuncarg._start()
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def deactivate_funcargs(self):
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capturing_funcarg = getattr(self, '_capturing_funcarg', None)
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if capturing_funcarg:
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outerr = capturing_funcarg._finalize()
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del self._capturing_funcarg
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return outerr
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def pytest_make_collect_report(self, __multicall__, collector):
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method = self._getmethod(collector.config, collector.fspath)
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try:
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self.resumecapture(method)
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except ValueError:
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return # recursive collect, XXX refactor capturing
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# to allow for more lightweight recursive capturing
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try:
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rep = __multicall__.execute()
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finally:
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outerr = self.suspendcapture()
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addouterr(rep, outerr)
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return rep
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@pytest.mark.tryfirst
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def pytest_runtest_setup(self, item):
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self.resumecapture_item(item)
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@pytest.mark.tryfirst
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def pytest_runtest_call(self, item):
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self.resumecapture_item(item)
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self.activate_funcargs(item)
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@pytest.mark.tryfirst
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def pytest_runtest_teardown(self, item):
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self.resumecapture_item(item)
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def pytest_keyboard_interrupt(self, excinfo):
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if hasattr(self, '_capturing'):
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self.suspendcapture()
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@pytest.mark.tryfirst
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def pytest_runtest_makereport(self, __multicall__, item, call):
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funcarg_outerr = self.deactivate_funcargs()
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rep = __multicall__.execute()
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outerr = self.suspendcapture(item)
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if funcarg_outerr is not None:
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outerr = (outerr[0] + funcarg_outerr[0],
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outerr[1] + funcarg_outerr[1])
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addouterr(rep, outerr)
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if not rep.passed or rep.when == "teardown":
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outerr = ('', '')
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item.outerr = outerr
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return rep
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error_capsysfderror = "cannot use capsys and capfd at the same time"
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def pytest_funcarg__capsys(request):
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"""enables capturing of writes to sys.stdout/sys.stderr and makes
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captured output available via ``capsys.readouterr()`` method calls
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which return a ``(out, err)`` tuple.
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"""
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if "capfd" in request._funcargs:
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raise request.raiseerror(error_capsysfderror)
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return CaptureFixture(py.io.StdCapture)
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def pytest_funcarg__capfd(request):
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"""enables capturing of writes to file descriptors 1 and 2 and makes
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captured output available via ``capsys.readouterr()`` method calls
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which return a ``(out, err)`` tuple.
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"""
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if "capsys" in request._funcargs:
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request.raiseerror(error_capsysfderror)
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if not hasattr(os, 'dup'):
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pytest.skip("capfd funcarg needs os.dup")
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return CaptureFixture(py.io.StdCaptureFD)
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class CaptureFixture:
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def __init__(self, captureclass):
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self.capture = captureclass(now=False)
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def _start(self):
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self.capture.startall()
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def _finalize(self):
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if hasattr(self, 'capture'):
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outerr = self._outerr = self.capture.reset()
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del self.capture
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return outerr
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def readouterr(self):
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try:
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return self.capture.readouterr()
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except AttributeError:
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return self._outerr
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def close(self):
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self._finalize()
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