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import pickle
import pytest
from pyrsistent import pdeque, dq
def test_basic_right_and_left():
x = pdeque([1, 2])
assert x.right == 2
assert x.left == 1
assert len(x) == 2
def test_construction_with_maxlen():
assert pdeque([1, 2, 3, 4], maxlen=2) == pdeque([3, 4])
assert pdeque([1, 2, 3, 4], maxlen=4) == pdeque([1, 2, 3, 4])
assert pdeque([], maxlen=2) == pdeque()
def test_construction_with_invalid_maxlen():
with pytest.raises(TypeError):
pdeque([], maxlen='foo')
with pytest.raises(ValueError):
pdeque([], maxlen=-3)
def test_pop():
x = pdeque([1, 2, 3, 4]).pop()
assert x.right == 3
assert x.left == 1
x = x.pop()
assert x.right == 2
assert x.left == 1
x = x.pop()
assert x.right == 1
assert x.left == 1
x = x.pop()
assert x == pdeque()
x = pdeque([1, 2]).pop()
assert x == pdeque([1])
x = x.pop()
assert x == pdeque()
assert pdeque().append(1).pop() == pdeque()
assert pdeque().appendleft(1).pop() == pdeque()
def test_pop_multiple():
assert pdeque([1, 2, 3, 4]).pop(3) == pdeque([1])
assert pdeque([1, 2]).pop(3) == pdeque()
def test_pop_with_negative_index():
assert pdeque([1, 2, 3]).pop(-1) == pdeque([1, 2, 3]).popleft(1)
assert pdeque([1, 2, 3]).popleft(-1) == pdeque([1, 2, 3]).pop(1)
def test_popleft():
x = pdeque([1, 2, 3, 4]).popleft()
assert x.left == 2
assert x.right == 4
x = x.popleft()
assert x.left == 3
assert x.right == 4
x = x.popleft()
assert x.right == 4
assert x.left == 4
x = x.popleft()
assert x == pdeque()
x = pdeque([1, 2]).popleft()
assert x == pdeque([2])
x = x.popleft()
assert x == pdeque()
assert pdeque().append(1).popleft() == pdeque()
assert pdeque().appendleft(1).popleft() == pdeque()
def test_popleft_multiple():
assert pdeque([1, 2, 3, 4]).popleft(3) == pdeque([4])
def test_left_on_empty_deque():
with pytest.raises(IndexError):
pdeque().left
def test_right_on_empty_deque():
with pytest.raises(IndexError):
pdeque().right
def test_pop_empty_deque_returns_empty_deque():
# The other option is to throw an index error, this is what feels best for now though
assert pdeque().pop() == pdeque()
assert pdeque().popleft() == pdeque()
def test_str():
assert str(pdeque([1, 2, 3])) == 'pdeque([1, 2, 3])'
assert str(pdeque([])) == 'pdeque([])'
assert str(pdeque([1, 2], maxlen=4)) == 'pdeque([1, 2], maxlen=4)'
def test_append():
assert pdeque([1, 2]).append(3).append(4) == pdeque([1, 2, 3, 4])
def test_append_with_maxlen():
assert pdeque([1, 2], maxlen=2).append(3).append(4) == pdeque([3, 4])
assert pdeque([1, 2], maxlen=3).append(3).append(4) == pdeque([2, 3, 4])
assert pdeque([], maxlen=0).append(1) == pdeque()
def test_appendleft():
assert pdeque([2, 1]).appendleft(3).appendleft(4) == pdeque([4, 3, 2, 1])
def test_appendleft_with_maxlen():
assert pdeque([2, 1], maxlen=2).appendleft(3).appendleft(4) == pdeque([4, 3])
assert pdeque([2, 1], maxlen=3).appendleft(3).appendleft(4) == pdeque([4, 3, 2])
assert pdeque([], maxlen=0).appendleft(1) == pdeque()
def test_extend():
assert pdeque([1, 2]).extend([3, 4]) == pdeque([1, 2, 3, 4])
def test_extend_with_maxlen():
assert pdeque([1, 2], maxlen=3).extend([3, 4]) == pdeque([2, 3, 4])
assert pdeque([1, 2], maxlen=2).extend([3, 4]) == pdeque([3, 4])
assert pdeque([], maxlen=2).extend([1, 2]) == pdeque([1, 2])
assert pdeque([], maxlen=0).extend([1, 2]) == pdeque([])
def test_extendleft():
assert pdeque([2, 1]).extendleft([3, 4]) == pdeque([4, 3, 2, 1])
def test_extendleft_with_maxlen():
assert pdeque([1, 2], maxlen=3).extendleft([3, 4]) == pdeque([4, 3, 1])
assert pdeque([1, 2], maxlen=2).extendleft([3, 4]) == pdeque([4, 3])
assert pdeque([], maxlen=2).extendleft([1, 2]) == pdeque([2, 1])
assert pdeque([], maxlen=0).extendleft([1, 2]) == pdeque([])
def test_count():
x = pdeque([1, 2, 3, 2, 1])
assert x.count(1) == 2
assert x.count(2) == 2
def test_remove():
assert pdeque([1, 2, 3, 4]).remove(2) == pdeque([1, 3, 4])
assert pdeque([1, 2, 3, 4]).remove(4) == pdeque([1, 2, 3])
# Right list must be reversed before removing element
assert pdeque([1, 2, 3, 3, 4, 5, 4, 6]).remove(4) == pdeque([1, 2, 3, 3, 5, 4, 6])
def test_remove_element_missing():
with pytest.raises(ValueError):
pdeque().remove(2)
with pytest.raises(ValueError):
pdeque([1, 2, 3]).remove(4)
def test_reverse():
assert pdeque([1, 2, 3, 4]).reverse() == pdeque([4, 3, 2, 1])
assert pdeque().reverse() == pdeque()
def test_rotate_right():
assert pdeque([1, 2, 3, 4, 5]).rotate(2) == pdeque([4, 5, 1, 2, 3])
assert pdeque([1, 2]).rotate(0) == pdeque([1, 2])
assert pdeque().rotate(2) == pdeque()
def test_rotate_left():
assert pdeque([1, 2, 3, 4, 5]).rotate(-2) == pdeque([3, 4, 5, 1, 2])
assert pdeque().rotate(-2) == pdeque()
def test_set_maxlen():
x = pdeque([], maxlen=4)
assert x.maxlen == 4
with pytest.raises(AttributeError):
x.maxlen = 5
def test_comparison():
small = pdeque([1, 2])
large = pdeque([1, 2, 3])
assert small < large
assert large > small
assert not small > large
assert not large < small
assert large != small
# Not equal to other types
assert small != [1, 2]
def test_pickling():
input = pdeque([1, 2, 3], maxlen=5)
output = pickle.loads(pickle.dumps(input, -1))
assert output == input
assert output.maxlen == input.maxlen
def test_indexing():
assert pdeque([1, 2, 3])[0] == 1
assert pdeque([1, 2, 3])[1] == 2
assert pdeque([1, 2, 3])[2] == 3
assert pdeque([1, 2, 3])[-1] == 3
assert pdeque([1, 2, 3])[-2] == 2
assert pdeque([1, 2, 3])[-3] == 1
def test_one_element_indexing():
assert pdeque([2])[0] == 2
assert pdeque([2])[-1] == 2
def test_empty_indexing():
with pytest.raises(IndexError):
assert pdeque([])[0] == 1
def test_indexing_out_of_range():
with pytest.raises(IndexError):
pdeque([1, 2, 3])[-4]
with pytest.raises(IndexError):
pdeque([1, 2, 3])[3]
with pytest.raises(IndexError):
pdeque([2])[-2]
def test_indexing_invalid_type():
with pytest.raises(TypeError) as e:
pdeque([1, 2, 3])['foo']
assert 'cannot be interpreted' in str(e.value)
def test_slicing():
assert pdeque([1, 2, 3])[1:2] == pdeque([2])
assert pdeque([1, 2, 3])[2:1] == pdeque([])
assert pdeque([1, 2, 3])[-2:-1] == pdeque([2])
assert pdeque([1, 2, 3])[::2] == pdeque([1, 3])
def test_hashing():
assert hash(pdeque([1, 2, 3])) == hash(pdeque().append(1).append(2).append(3))
def test_index():
assert pdeque([1, 2, 3]).index(3) == 2
def test_literalish():
assert dq(1, 2, 3) == pdeque([1, 2, 3])
def test_supports_weakref():
import weakref
weakref.ref(dq(1, 2))
def test_iterable():
"""
PDeques can be created from iterables even though they can't be len()
hinted.
"""
assert pdeque(iter("a")) == pdeque(iter("a"))
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