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import unittest
from pytrie import SortedStringTrie
class TestTrie(unittest.TestCase):
def setUp(self):
self.words = 'an ant all allot alloy aloe are ate be'.split()
self.trie = SortedStringTrie(zip(self.words, range(len(self.words))))
def test_longest_prefix(self):
self.assertEqual(self.trie.longest_prefix('antonym'), 'ant')
self.assertEqual(self.trie.longest_prefix('are'), 'are')
self.assertEqual(self.trie.longest_prefix('alla'), 'all')
self.assertEqual(self.trie.longest_prefix('allo'), 'all')
self.assertRaises(KeyError, self.trie.longest_prefix_item, 'alumni')
self.assertEqual(self.trie.longest_prefix('alumni', default=None), None)
self.assertEqual(self.trie.longest_prefix('linux', default=-1), -1)
def test_longest_prefix_value(self):
self.assertEqual(self.trie.longest_prefix_value('antonym'), 1)
self.assertEqual(self.trie.longest_prefix_value('are'), 6)
self.assertEqual(self.trie.longest_prefix_value('alla'), 2)
self.assertEqual(self.trie.longest_prefix_value('allo'), 2)
self.assertRaises(KeyError, self.trie.longest_prefix_value, 'alumni')
self.assertEqual(self.trie.longest_prefix_value('alumni', default=None),
None)
self.assertEqual(self.trie.longest_prefix_value('linux', default=-1),
-1)
def test_longest_prefix_item(self):
self.assertEqual(self.trie.longest_prefix_item('antonym'), ('ant', 1))
self.assertEqual(self.trie.longest_prefix_item('are'), ('are', 6))
self.assertEqual(self.trie.longest_prefix_item('alla'), ('all', 2))
self.assertEqual(self.trie.longest_prefix_item('allo'), ('all', 2))
self.assertRaises(KeyError, self.trie.longest_prefix_item, 'alumni')
self.assertEqual(self.trie.longest_prefix_item('alumni', default=None),
None)
self.assertEqual(self.trie.longest_prefix_item('linux', default=-1), -1)
def test_iter_prefixes(self):
self.assertEqual(list(self.trie.iter_prefixes('antonym')),
['an', 'ant'])
self.assertEqual(list(self.trie.iter_prefixes('are')), ['are'])
self.assertEqual(list(self.trie.iter_prefixes('alumni')), [])
def test_iter_prefix_values(self):
self.assertEqual(list(self.trie.iter_prefix_values('antonym')), [0, 1])
self.assertEqual(list(self.trie.iter_prefix_values('are')), [6])
self.assertEqual(list(self.trie.iter_prefix_values('alumni')), [])
def test_iter_prefix_items(self):
self.assertEqual(list(self.trie.iter_prefix_items('antonym')),
[('an', 0), ('ant', 1)])
self.assertEqual(list(self.trie.iter_prefix_items('are')), [('are', 6)])
self.assertEqual(list(self.trie.iter_prefix_items('alumni')), [])
def test_keys_wprefix(self):
self.assertEqual(self.trie.keys('al'),
['all', 'allot', 'alloy', 'aloe'])
self.assertEqual(self.trie.keys('are'), ['are'])
self.assertEqual(self.trie.keys('ann'), [])
def test_values_wprefix(self):
self.assertEqual(self.trie.values('al'), [2, 3, 4, 5])
self.assertEqual(self.trie.values('are'), [6])
self.assertEqual(self.trie.values('ann'), [])
def test_items_wprefix(self):
self.assertEqual(self.trie.items('al'),
[('all', 2), ('allot', 3), ('alloy', 4), ('aloe', 5)])
self.assertEqual(self.trie.items('are'), [('are', 6)])
self.assertEqual(self.trie.items('ann'), [])
def test_consistency_wprefix(self):
trie = self.trie
for prefix in 'al', 'are', 'ann':
self.assertEqual(
trie.items(prefix),
list(zip(trie.keys(prefix), trie.values(prefix)))
)
def test_empty_string(self):
self.trie[''] = '!'
self.assertEqual(self.trie.keys(''),
['', 'all', 'allot', 'alloy', 'aloe', 'an', 'ant',
'are', 'ate', 'be'])
self.assertEqual(self.trie.values(''),
['!', 2, 3, 4, 5, 0, 1, 6, 7, 8])
self.assertEqual(self.trie.items(''),
[('', '!'), ('all', 2), ('allot', 3), ('alloy', 4),
('aloe', 5), ('an', 0), ('ant', 1), ('are', 6),
('ate', 7), ('be', 8)])
self.assertEqual(list(self.trie.iter_prefixes('foo')), [''])
self.assertEqual(list(self.trie.iter_prefix_values('foo')), ['!'])
self.assertEqual(list(self.trie.iter_prefix_items('foo')), [('', '!')])
self.assertEqual(self.trie.longest_prefix('foo'), '')
self.assertEqual(self.trie.longest_prefix_value('foo'), '!')
self.assertEqual(self.trie.longest_prefix_item('foo'), ('', '!'))
def test_pickle(self):
from pickle import dumps, loads, HIGHEST_PROTOCOL
for proto in range(HIGHEST_PROTOCOL):
unpickled = loads(dumps(self.trie, proto))
self.assertEqual(self.trie, unpickled)
self.assertTrue(type(self.trie) is type(unpickled))
self.assertTrue(self.trie is not unpickled)
def test_repr(self):
evaled = eval(repr(self.trie))
self.assertEqual(evaled, self.trie)
self.assertEqual(evaled.__class__, self.trie.__class__)
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