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"""
This plugin captures stdout during test execution. If the test fails
or raises an error, the captured output will be appended to the error
or failure output. It is enabled by default but can be disabled with
the options ``-s`` or ``--nocapture``.
:Options:
``--nocapture``
Don't capture stdout (any stdout output will be printed immediately)
"""
import logging
import os
import sys
from nose.plugins.base import Plugin
from nose.pyversion import exc_to_unicode, force_unicode
from nose.util import ln
from io import StringIO
log = logging.getLogger(__name__)
class Capture(Plugin):
"""
Output capture plugin. Enabled by default. Disable with ``-s`` or
``--nocapture``. This plugin captures stdout during test execution,
appending any output captured to the error or failure output,
should the test fail or raise an error.
"""
enabled = True
env_opt = 'NOSE_NOCAPTURE'
name = 'capture'
score = 1600
def __init__(self):
self.stdout = []
self._buf = None
def options(self, parser, env):
"""Register commandline options
"""
parser.add_option(
"-s", "--nocapture", action="store_false",
default=not env.get(self.env_opt), dest="capture",
help="Don't capture stdout (any stdout output "
"will be printed immediately) [NOSE_NOCAPTURE]")
def configure(self, options, conf):
"""Configure plugin. Plugin is enabled by default.
"""
self.conf = conf
if not options.capture:
self.enabled = False
def afterTest(self, test):
"""Clear capture buffer.
"""
self.end()
self._buf = None
def begin(self):
"""Replace sys.stdout with capture buffer.
"""
self.start() # get an early handle on sys.stdout
def beforeTest(self, test):
"""Flush capture buffer.
"""
self.start()
def formatError(self, test, err):
"""Add captured output to error report.
"""
test.capturedOutput = output = self.buffer
self._buf = None
if not output:
# Don't return None as that will prevent other
# formatters from formatting and remove earlier formatters
# formats, instead return the err we got
return err
ec, ev, tb = err
return (ec, self.addCaptureToErr(ev, output), tb)
def formatFailure(self, test, err):
"""Add captured output to failure report.
"""
return self.formatError(test, err)
def addCaptureToErr(self, ev, output):
ev = exc_to_unicode(ev)
output = force_unicode(output)
return '\n'.join([ev, ln('>> begin captured stdout <<'),
output, ln('>> end captured stdout <<')])
def start(self):
self.stdout.append(sys.stdout)
self._buf = StringIO()
sys.stdout = self._buf
def end(self):
if self.stdout:
sys.stdout = self.stdout.pop()
def finalize(self, result):
"""Restore stdout.
"""
while self.stdout:
self.end()
def _get_buffer(self):
if self._buf is not None:
return self._buf.getvalue()
buffer = property(_get_buffer, None, None,
"""Captured stdout output.""")
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