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#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import division, print_function
from nose.tools import assert_equal
from ..lru_cache import LRUCache
def test_cache_callback():
dropped = []
callback = lambda *args: dropped.append(args)
c = LRUCache(2, cache_drop_callback=callback)
for i in range(5):
c[i] = str(i)
expected = [(0, '0'), (1, '1'), (2, '2')]
assert_equal(expected, dropped)
def test_cache_len():
c = LRUCache(2)
assert_equal(0, len(c))
assert_equal(2, c.size)
c[0] = None
assert_equal(1, len(c))
assert_equal(2, c.size)
c[1] = None
assert_equal(2, len(c))
assert_equal(2, c.size)
c[2] = None
assert_equal(2, len(c))
assert_equal(2, c.size)
def test_cache_resize():
c = LRUCache(1)
c[0] = 0
c[1] = 1
assert_equal(1, len(c))
assert_equal(1, c.size)
assert 0 not in c
assert 1 in c
c.size = 3
assert_equal(1, len(c))
assert_equal(3, c.size)
assert 1 in c
c[2] = 2
assert_equal(2, len(c))
assert_equal(3, c.size)
assert 1 in c
assert 2 in c
c[3] = 3
assert_equal(3, len(c))
assert_equal(3, c.size)
assert 1 in c
assert 2 in c
assert 3 in c
c[4] = 4
assert_equal(3, len(c))
assert_equal(3, c.size)
assert 1 not in c
assert 2 in c
assert 3 in c
assert 4 in c
def test_cache_items():
c = LRUCache(2)
assert_equal([], c.items())
c[0] = str(0)
c[1] = str(1)
c[2] = str(2)
expected = [(1, '1'), (2, '2')]
assert_equal(expected, sorted(c.items()))
def test_cache_idempotency():
c = LRUCache(2)
c[1] = 1
assert_equal(1, len(c))
c[1] = 1
assert_equal(1, len(c))
c[2] = 2
assert_equal(2, len(c))
c[1] = 1
assert_equal(2, len(c))
c[2] = 2
assert_equal(2, len(c))
c[3] = 3
assert_equal(2, len(c))
c[3] = 3
assert_equal(2, len(c))
def test_cache_keys_values():
c = LRUCache(2)
assert_equal([], c.items())
c[0] = str(0)
c[1] = str(1)
c[2] = str(2)
expected = [1, 2]
assert_equal(expected, sorted(c.keys()))
assert_equal(map(str, expected), sorted(c.values()))
def test_cache_clear():
c = LRUCache(2)
for i in range(c.size):
c[i] = i
assert_equal(c.size, len(c))
c.clear()
assert_equal(0, len(c))
def test_cache_get():
c = LRUCache(2)
for i in range(c.size):
c[i] = i
assert_equal(0, c.get(0))
assert_equal(None, c.get(c.size))
def test_updated_event():
c = LRUCache(2)
events = []
# Traits can't handle builtins as handlers
c.on_trait_change(lambda x: events.append(x), 'updated')
c[0] = 0
print(c.keys())
assert_equal(sorted(events), [[0]])
c[1] = 1
assert_equal(sorted(events), [[0], [0, 1]])
c[2] = 2
assert_equal(sorted(events), [[0], [0, 1], [1, 2]])
# Getting items doesn't fire anything
c[1]
assert_equal(sorted(events), [[0], [0, 1], [1, 2]])
c.get(3)
assert_equal(sorted(events), [[0], [0, 1], [1, 2]])
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