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"""Test diskcache.persistent.Deque."""
import pickle
import shutil
import tempfile
from unittest import mock
import pytest
import diskcache as dc
from diskcache.core import ENOVAL
def rmdir(directory):
try:
shutil.rmtree(directory)
except OSError:
pass
@pytest.fixture
def deque():
deque = dc.Deque()
yield deque
rmdir(deque.directory)
def test_init():
directory = tempfile.mkdtemp()
sequence = list('abcde')
deque = dc.Deque(sequence, None)
assert deque == sequence
rmdir(deque.directory)
del deque
rmdir(directory)
deque = dc.Deque(sequence, directory)
assert deque.directory == directory
assert deque == sequence
other = dc.Deque(directory=directory)
assert other == deque
del deque
del other
rmdir(directory)
def test_getsetdel(deque):
sequence = list('abcde')
assert len(deque) == 0
for key in sequence:
deque.append(key)
assert len(deque) == len(sequence)
for index in range(len(sequence)):
assert deque[index] == sequence[index]
for index in range(len(sequence)):
deque[index] = index
for index in range(len(sequence)):
assert deque[index] == index
for index in range(len(sequence)):
if index % 2:
del deque[-1]
else:
del deque[0]
assert len(deque) == 0
def test_append(deque):
deque.maxlen = 3
for item in 'abcde':
deque.append(item)
assert deque == 'cde'
def test_appendleft(deque):
deque.maxlen = 3
for item in 'abcde':
deque.appendleft(item)
assert deque == 'edc'
def test_index_positive(deque):
cache = mock.MagicMock()
cache.__len__.return_value = 3
cache.iterkeys.return_value = ['a', 'b', 'c']
cache.__getitem__.side_effect = [KeyError, 101, 102]
with mock.patch.object(deque, '_cache', cache):
assert deque[0] == 101
def test_index_negative(deque):
cache = mock.MagicMock()
cache.__len__.return_value = 3
cache.iterkeys.return_value = ['c', 'b', 'a']
cache.__getitem__.side_effect = [KeyError, 101, 100]
with mock.patch.object(deque, '_cache', cache):
assert deque[-1] == 101
def test_index_out_of_range(deque):
cache = mock.MagicMock()
cache.__len__.return_value = 3
cache.iterkeys.return_value = ['a', 'b', 'c']
cache.__getitem__.side_effect = [KeyError] * 3
with mock.patch.object(deque, '_cache', cache):
with pytest.raises(IndexError):
deque[0]
def test_iter_keyerror(deque):
cache = mock.MagicMock()
cache.iterkeys.return_value = ['a', 'b', 'c']
cache.__getitem__.side_effect = [KeyError, 101, 102]
with mock.patch.object(deque, '_cache', cache):
assert list(iter(deque)) == [101, 102]
def test_reversed(deque):
sequence = list('abcde')
deque += sequence
assert list(reversed(deque)) == list(reversed(sequence))
def test_reversed_keyerror(deque):
cache = mock.MagicMock()
cache.iterkeys.return_value = ['c', 'b', 'a']
cache.__getitem__.side_effect = [KeyError, 101, 100]
with mock.patch.object(deque, '_cache', cache):
assert list(reversed(deque)) == [101, 100]
def test_state(deque):
sequence = list('abcde')
deque.extend(sequence)
assert deque == sequence
deque.maxlen = 3
assert list(deque) == sequence[-3:]
state = pickle.dumps(deque)
values = pickle.loads(state)
assert values == sequence[-3:]
assert values.maxlen == 3
def test_compare(deque):
assert not (deque == {})
assert not (deque == [0])
assert deque != [1]
deque.append(0)
assert deque <= [0]
assert deque <= [1]
def test_indexerror_negative(deque):
with pytest.raises(IndexError):
deque[-1]
def test_indexerror(deque):
with pytest.raises(IndexError):
deque[0]
def test_repr():
directory = tempfile.mkdtemp()
deque = dc.Deque(directory=directory)
assert repr(deque) == 'Deque(directory=%r)' % directory
def test_copy(deque):
sequence = list('abcde')
deque.extend(sequence)
temp = deque.copy()
assert deque == sequence
assert temp == sequence
def test_count(deque):
deque += 'abbcccddddeeeee'
for index, value in enumerate('abcde', 1):
assert deque.count(value) == index
def test_extend(deque):
sequence = list('abcde')
deque.extend(sequence)
assert deque == sequence
def test_extendleft(deque):
sequence = list('abcde')
deque.extendleft(sequence)
assert deque == list(reversed(sequence))
def test_pop(deque):
sequence = list('abcde')
deque.extend(sequence)
while sequence:
assert deque.pop() == sequence.pop()
def test_pop_indexerror(deque):
with pytest.raises(IndexError):
deque.pop()
def test_popleft(deque):
sequence = list('abcde')
deque.extend(sequence)
while sequence:
value = sequence[0]
assert deque.popleft() == value
del sequence[0]
def test_popleft_indexerror(deque):
with pytest.raises(IndexError):
deque.popleft()
def test_remove(deque):
deque.extend('abaca')
deque.remove('a')
assert deque == 'baca'
deque.remove('a')
assert deque == 'bca'
deque.remove('a')
assert deque == 'bc'
def test_remove_valueerror(deque):
with pytest.raises(ValueError):
deque.remove(0)
def test_remove_keyerror(deque):
cache = mock.MagicMock()
cache.iterkeys.return_value = ['a', 'b', 'c']
cache.__getitem__.side_effect = [KeyError, 100, 100]
cache.__delitem__.side_effect = [KeyError, None]
with mock.patch.object(deque, '_cache', cache):
deque.remove(100)
def test_reverse(deque):
deque += 'abcde'
deque.reverse()
assert deque == 'edcba'
def test_rotate_typeerror(deque):
with pytest.raises(TypeError):
deque.rotate(0.5)
def test_rotate(deque):
deque.rotate(1)
deque.rotate(-1)
deque += 'abcde'
deque.rotate(3)
assert deque == 'cdeab'
def test_rotate_negative(deque):
deque += 'abcde'
deque.rotate(-2)
assert deque == 'cdeab'
def test_rotate_indexerror(deque):
deque += 'abc'
cache = mock.MagicMock()
cache.__len__.return_value = 3
cache.pull.side_effect = [(None, ENOVAL)]
with mock.patch.object(deque, '_cache', cache):
deque.rotate(1)
def test_rotate_indexerror_negative(deque):
deque += 'abc'
cache = mock.MagicMock()
cache.__len__.return_value = 3
cache.pull.side_effect = [(None, ENOVAL)]
with mock.patch.object(deque, '_cache', cache):
deque.rotate(-1)
def test_peek(deque):
value = b'x' * 100_000
deque.append(value)
assert len(deque) == 1
assert deque.peek() == value
assert len(deque) == 1
assert deque.peek() == value
assert len(deque) == 1
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