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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at
from __future__ import absolute_import
import inspect
import io
import os
from six import (
import sys
import unittest
from unittest import TextTestRunner as _TestRunner, TestResult as _TestResult
import pytest
import six
here = os.path.abspath(os.path.dirname(__file__))
# buildconfig doesn't yet support Python 3, so we can use pathlib to
# resolve the topsrcdir relative to our current location.
from pathlib import Path
topsrcdir = Path(here).parents[2]
except ImportError:
from mozbuild.base import MozbuildObject
build = MozbuildObject.from_environment(cwd=here)
topsrcdir = build.topsrcdir
"""Helper to make python unit tests report the way that the Mozilla
unit test infrastructure expects tests to report.
import mozunit
if __name__ == '__main__':
class _MozTestResult(_TestResult):
def __init__(self, stream, descriptions):
_TestResult.__init__(self) = stream
self.descriptions = descriptions
def getDescription(self, test):
if self.descriptions:
return test.shortDescription() or str(test)
return str(test)
def printStatus(self, status, test, message=""):
line = "{status} | {file} | {klass}.{test}{sep}{message}".format(
sep=", " if message else "",
def addSuccess(self, test):
_TestResult.addSuccess(self, test)
self.printStatus("TEST-PASS", test)
def addSkip(self, test, reason):
_TestResult.addSkip(self, test, reason)
self.printStatus("TEST-SKIP", test)
def addExpectedFailure(self, test, err):
_TestResult.addExpectedFailure(self, test, err)
self.printStatus("TEST-KNOWN-FAIL", test)
def addUnexpectedSuccess(self, test):
_TestResult.addUnexpectedSuccess(self, test)
self.printStatus("TEST-UNEXPECTED-PASS", test)
def addError(self, test, err):
_TestResult.addError(self, test, err)
self.printFail(test, err)"ERROR: {0}".format(self.getDescription(test)))[-1][1])
def addFailure(self, test, err):
_TestResult.addFailure(self, test, err)
self.printFail(test, err)"FAIL: {0}".format(self.getDescription(test)))[-1][1])
def printFail(self, test, err):
exctype, value, tb = err
message = value or "NO MESSAGE"
if hasattr(value, "message"):
message = value.message.splitlines()[0]
# Skip test runner traceback levels
while tb and self._is_relevant_tb_level(tb):
tb = tb.tb_next
if tb:
_, ln, _ = inspect.getframeinfo(tb)[:3]
message = "line {0}: {1}".format(ln, message)
self.printStatus("TEST-UNEXPECTED-FAIL", test, message)
class MozTestRunner(_TestRunner):
def _makeResult(self):
return _MozTestResult(, self.descriptions)
def run(self, test):
result = self._makeResult()
return result
def _mocked_file(cls):
"""Create a mocked file class that inherits from the given class."""
class MockedFile(cls):
def __init__(self, context, filename, content):
self.context = context = filename
cls.__init__(self, content)
def close(self):
self.context.files[] = self.getvalue()
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
return MockedFile
MockedStringFile = _mocked_file(StringIO)
MockedBytesFile = _mocked_file(BytesIO)
def normcase(path):
Normalize the case of `path`.
Don't use `os.path.normcase` because that also normalizes forward slashes
to backslashes on Windows.
if sys.platform.startswith("win"):
return path.lower()
return path
class _MockBaseOpen(object):
"""Callable that acts like the open() function; see MockedOpen for more
def __init__(self, open, files): = open
self.files = files
def __call__(
self, name, mode="r", buffering=None, encoding=None, newline=None, errors=None
# open() can be called with an integer "name" (i.e. a file descriptor).
# We don't generally do this in our codebase, but internal Python
# libraries sometimes do and we want to handle that cleanly.
if isinstance(name, int):
# buffering is ignored.
absname = normcase(os.path.abspath(name))
if "w" in mode:
file = self._mocked_file(absname, mode)
elif absname in self.files:
content = self.files[absname]
if content is None:
raise IOError(2, "No such file or directory")
file = self._mocked_file(absname, mode, content)
elif "a" in mode:
read_mode = "rb" if "b" in mode else "r"
file = self._mocked_file(absname, mode,, read_mode).read())
file =, mode)
if "a" in mode:, os.SEEK_END)
return file
def _mocked_file(self, name, mode, content=None):
raise NotImplementedError("subclass must implement")
class _MockPy2Open(_MockBaseOpen):
def _mocked_file(self, name, mode, content=None):
content = six.ensure_binary(content or b"")
return MockedBytesFile(self, name, content)
class _MockOpen(_MockBaseOpen):
def _mocked_file(self, name, mode, content=None):
if "b" in mode:
content = six.ensure_binary(content or b"")
return MockedBytesFile(self, name, content)
content = six.ensure_text(content or u"")
return MockedStringFile(self, name, content)
class MockedOpen(object):
Context manager diverting the open builtin such that opening files
can open "virtual" file instances given when creating a MockedOpen.
with MockedOpen({'foo': 'foo', 'bar': 'bar'}):
f = open('foo', 'r')
will thus open the virtual file instance for the file 'foo' to f.
If the content of a file is given as None, then that file will be
represented as not existing (even if it does, actually, exist).
MockedOpen also masks writes, so that creating or replacing files
doesn't touch the file system, while subsequently opening the file
will return the recorded content.
with MockedOpen():
f = open('foo', 'w')
self.assertRaises(Exception,'foo', 'r'))
def __init__(self, files={}):
self.files = {}
for name, content in files.items():
self.files[normcase(os.path.abspath(name))] = content
def __enter__(self):
import six.moves.builtins =
self.io_open =
self._orig_path_exists = os.path.exists
self._orig_path_isdir = os.path.isdir
self._orig_path_isfile = os.path.isfile
builtin_cls = _MockPy2Open if six.PY2 else _MockOpen = builtin_cls(, self.files) = _MockOpen(self.io_open, self.files)
os.path.exists = self._wrapped_exists
os.path.isdir = self._wrapped_isdir
os.path.isfile = self._wrapped_isfile
def __exit__(self, type, value, traceback):
import six.moves.builtins = = self.io_open
os.path.exists = self._orig_path_exists
os.path.isdir = self._orig_path_isdir
os.path.isfile = self._orig_path_isfile
def _wrapped_exists(self, p):
return self._wrapped_isfile(p) or self._wrapped_isdir(p)
def _wrapped_isfile(self, p):
p = normcase(p)
if p in self.files:
return self.files[p] is not None
abspath = normcase(os.path.abspath(p))
if abspath in self.files:
return self.files[abspath] is not None
return self._orig_path_isfile(p)
def _wrapped_isdir(self, p):
p = normcase(p)
p = p if p.endswith(("/", "\\")) else p + os.sep
if any(f.startswith(p) for f in self.files):
return True
abspath = normcase(os.path.abspath(p) + os.sep)
if any(f.startswith(abspath) for f in self.files):
return True
return self._orig_path_isdir(p)
def main(*args, **kwargs):
runwith = kwargs.pop("runwith", "pytest")
if runwith == "unittest":
unittest.main(testRunner=MozTestRunner(), *args, **kwargs)
args = list(args)
if os.environ.get("MACH_STDOUT_ISATTY") and not any(
a.startswith("--color") for a in args
module = __import__("__main__")
os.path.join(here, "pytest.ini"),
"-rsx", # show reasons for skip / xfail