def test_read_slack(self, testfs_fat_stable1):
""" Test if reading content of slackspace in a simple case works """
for img_path in testfs_fat_stable1:
with open(img_path, 'rb+') as img_stream:
# create FileSlack object
fatfs = FileSlack(img_stream)
teststring = "This is a simple write test."
# write content that we want to read
with io.BytesIO() as mem:
mem.write(teststring.encode('utf-8'))
mem.seek(0)
with io.BufferedReader(mem) as reader:
write_res = fatfs.write(reader, ['another'])
# read content we wrote and compare result with
# our initial test message
with io.BytesIO() as mem:
fatfs.read(mem, write_res)
mem.seek(0)
result = mem.read()
assert result.decode('utf-8') == teststring
def test_clear_slack(self, testfs_fat_stable1):
""" Test if clearing slackspace of a file works """
for img_path in testfs_fat_stable1:
with open(img_path, 'rb+') as img_stream:
# create FileSlack object
fatfs = FileSlack(img_stream)
teststring = "This is a simple write test."
# write content that we want to clear
with io.BytesIO() as mem:
mem.write(teststring.encode('utf-8'))
mem.seek(0)
with io.BufferedReader(mem) as reader:
write_res = fatfs.write(reader, ['another'])
fatfs.clear(write_res)
# clear content we wrote, then read the cleared part again.
# As it should be overwritten we expect a stream of \x00
with io.BytesIO() as mem:
fatfs.read(mem, write_res)
mem.seek(0)
result = mem.read()
expected = len(teststring.encode('utf-8')) * b'\x00'
assert result == expected