def test_fail_open_nonexistant_dir():
""" Test that program refuses to write to non-existant directory. """
try:
open_filepath('ab/cd/ef/gh/ij/kl')
assert False, "should have raised assertion"
except AssertionError as err:
assert err.args[0].startswith('directory'), err.args[0]
assert err.args[0].endswith('does not exist.'), err.args[0]
def test_fail_cannot_write_to_folder():
""" Test that program refuses to write to directory without write access. """
try:
open_filepath('/test.write')
assert False, "should have raised assertion"
except AssertionError as err:
assert err.args[0].startswith('directory'), err.args[0]
assert 'is not writable' in err.args[0], err.args[0]
assert err.args[0].endswith('does not exist.'), err.args[0]
def test_fail_cannot_write_to_special_dev():
""" Test that program refuses to write to special device. """
# not necessarily something to prevent from a power user ... but
# something to prevent from automated programs: such as
# following a maliciously plotted symlink.
try:
open_filepath('/dev/stdout')
assert False, "should have raised assertion"
except AssertionError as err:
assert err.args[0].startswith('/dev/stdout'), err.args[0]
assert err.args[0].endswith('is not a file.'), err.args[0]
def test_fail_cannot_write_to_file():
""" Test that program refuses to write to file without write access. """
import os
assert not os.path.exists('/tmp/test-minus-r')
fp = open('/tmp/test-minus-r', 'w')
fp.write('')
fp.close()
os.chmod('/tmp/test-minus-r', 0)
assert os.path.isfile('/tmp/test-minus-r')
try:
open_filepath('/tmp/test-minus-r')
assert False, "should have raised assertion"
except AssertionError as err:
assert err.args[0].startswith('no write access to'), err.args[0]
assert err.args[0].endswith('/tmp/test-minus-r.'), err.args[0]
os.unlink('/tmp/test-minus-r')