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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
"""Helpers for coverage.py tests."""
import os
import subprocess
import sys
from coverage import env
from coverage.backward import unicode_class
from coverage.misc import output_encoding
def run_command(cmd):
"""Run a command in a sub-process.
Returns the exit status code and the combined stdout and stderr.
"""
if env.PY2 and isinstance(cmd, unicode_class):
cmd = cmd.encode(sys.getfilesystemencoding())
# In some strange cases (PyPy3 in a virtualenv!?) the stdout encoding of
# the subprocess is set incorrectly to ascii. Use an environment variable
# to force the encoding to be the same as ours.
sub_env = dict(os.environ)
encoding = output_encoding()
if encoding:
sub_env['PYTHONIOENCODING'] = encoding
proc = subprocess.Popen(
cmd,
shell=True,
env=sub_env,
stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT
)
output, _ = proc.communicate()
status = proc.returncode
# Get the output, and canonicalize it to strings with newlines.
if not isinstance(output, str):
output = output.decode(output_encoding())
output = output.replace('\r', '')
return status, output
class CheckUniqueFilenames(object):
"""Asserts the uniqueness of file names passed to a function."""
def __init__(self, wrapped):
self.filenames = set()
self.wrapped = wrapped
@classmethod
def hook(cls, cov, method_name):
"""Replace a method with our checking wrapper."""
method = getattr(cov, method_name)
hook = cls(method)
setattr(cov, method_name, hook.wrapper)
return hook
def wrapper(self, filename, *args, **kwargs):
"""The replacement method. Check that we don't have dupes."""
assert filename not in self.filenames, (
"File name %r passed to %r twice" % (filename, self.wrapped)
)
self.filenames.add(filename)
ret = self.wrapped(filename, *args, **kwargs)
return ret
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