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asserts.py
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asserts.py
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# -*- coding: utf-8 -*-
# <Lettuce - Behaviour Driven Development for python>
# Copyright (C) <2010-2012> Gabriel Falcão <gabriel@nacaolivre.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import re
import sys
from StringIO import StringIO
from nose.tools import assert_equals, assert_not_equals
from lettuce import registry
from difflib import Differ
def prepare_stdout():
registry.clear()
if isinstance(sys.stdout, StringIO):
del sys.stdout
std = StringIO()
sys.stdout = std
def prepare_stderr():
registry.clear()
if isinstance(sys.stderr, StringIO):
del sys.stderr
std = StringIO()
sys.stderr = std
def assert_lines(original, expected):
original = original.decode('utf-8') if isinstance(original, basestring) else original
assert_lines_unicode(original, expected)
def assert_lines_unicode(original, expected):
if original != expected:
diff = ''.join(list(Differ().compare(expected.splitlines(1), original.splitlines(1))))
raise AssertionError, 'Output differed as follows:\n' + diff + "\nOutput was:\n" + original +"\nExpected was:\n"+expected
assert_equals(len(expected), len(original), 'Output appears equal, but of different lengths.')
def assert_lines_with_traceback(one, other):
lines_one = one.splitlines()
lines_other = other.splitlines()
regex = re.compile('File "([^"]+)", line \d+, in.*')
error = '%r should be in traceback line %r.\nFull output was:\n' + one
for line1, line2 in zip(lines_one, lines_other):
if regex.search(line1) and regex.search(line2):
found = regex.search(line2)
filename = found.group(1)
params = filename, line1
assert filename in line1, error % params
else:
assert_unicode_equals(line1, line2)
assert_unicode_equals(len(lines_one), len(lines_other))
def assert_unicode_equals(original, expected):
if isinstance(original, basestring):
original = original.decode('utf-8')
assert_equals(original, expected)
def assert_stderr(expected):
string = sys.stderr.getvalue()
assert_unicode_equals(string, expected)
def assert_stdout(expected):
string = sys.stdout.getvalue()
assert_unicode_equals(string, expected)
def assert_stdout_lines(other):
assert_lines(sys.stdout.getvalue(), other)
def assert_stderr_lines(other):
assert_lines(sys.stderr.getvalue(), other)
def assert_stdout_lines_with_traceback(other):
assert_lines_with_traceback(sys.stdout.getvalue(), other)
def assert_stderr_lines_with_traceback(other):
assert_lines_with_traceback(sys.stderr.getvalue(), other)