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from algorithms.map import (

HashTable, ResizableHashTable,

Node, SeparateChainingHashTable,

word_pattern,

is_isomorphic,

is_anagram,

longest_palindromic_subsequence,

)

import unittest

class TestHashTable(unittest.TestCase):

def test_one_entry(self):

m = HashTable(10)

m.put(1, '1')

self.assertEqual('1', m.get(1))

def test_add_entry_bigger_than_table_size(self):

m = HashTable(10)

m.put(11, '1')

self.assertEqual('1', m.get(11))

def test_get_none_if_key_missing_and_hash_collision(self):

m = HashTable(10)

m.put(1, '1')

self.assertEqual(None, m.get(11))

def test_two_entries_with_same_hash(self):

m = HashTable(10)

m.put(1, '1')

m.put(11, '11')

self.assertEqual('1', m.get(1))

self.assertEqual('11', m.get(11))

def test_get_on_full_table_does_halts(self):

# and does not search forever

m = HashTable(10)

for i in range(10, 20):

m.put(i, i)

self.assertEqual(None, m.get(1))

def test_delete_key(self):

m = HashTable(10)

for i in range(5):

m.put(i, i**2)

m.del_(1)

self.assertEqual(None, m.get(1))

self.assertEqual(4,m.get(2))

def test_delete_key_and_reassign(self):

m = HashTable(10)

m.put(1, 1)

del m[1]

m.put(1, 2)

self.assertEqual(2, m.get(1))

def test_assigning_to_full_table_throws_error(self):

m = HashTable(3)

m.put(1, 1)

m.put(2, 2)

m.put(3, 3)

with self.assertRaises(ValueError):

m.put(4, 4)

def test_len_trivial(self):

m = HashTable(10)

self.assertEqual(0, len(m))

for i in range(10):

m.put(i, i)

self.assertEqual(i + 1, len(m))

def test_len_after_deletions(self):

m = HashTable(10)

m.put(1, 1)

self.assertEqual(1, len(m))

m.del_(1)

self.assertEqual(0, len(m))

m.put(11, 42)

self.assertEqual(1, len(m))

def test_resizable_hash_table(self):

m = ResizableHashTable()

self.assertEqual(ResizableHashTable.MIN_SIZE, m.size)

for i in range(ResizableHashTable.MIN_SIZE):

m.put(i, 'foo')

self.assertEqual(ResizableHashTable.MIN_SIZE * 2, m.size)

self.assertEqual('foo', m.get(1))

self.assertEqual('foo', m.get(3))

self.assertEqual('foo', m.get(ResizableHashTable.MIN_SIZE - 1))

def test_fill_up_the_limit(self):

m = HashTable(10)

for i in range(10):

m.put(i,i**2)

for i in range(10):

self.assertEqual(i**2,m.get(i))

class TestSeparateChainingHashTable(unittest.TestCase):

def test_one_entry(self):

m = SeparateChainingHashTable(10)

m.put(1, '1')

self.assertEqual('1', m.get(1))

def test_two_entries_with_same_hash(self):

m = SeparateChainingHashTable(10)

m.put(1, '1')

m.put(11, '11')

self.assertEqual('1', m.get(1))

self.assertEqual('11', m.get(11))

def test_len_trivial(self):

m = SeparateChainingHashTable(10)

self.assertEqual(0, len(m))

for i in range(10):

m.put(i, i)

self.assertEqual(i + 1, len(m))

def test_len_after_deletions(self):

m = SeparateChainingHashTable(10)

m.put(1, 1)

self.assertEqual(1, len(m))

m.del_(1)

self.assertEqual(0, len(m))

m.put(11, 42)

self.assertEqual(1, len(m))

def test_delete_key(self):

m = SeparateChainingHashTable(10)

for i in range(5):

m.put(i, i**2)

m.del_(1)

self.assertEqual(None, m.get(1))

self.assertEqual(4, m.get(2))

def test_delete_key_and_reassign(self):

m = SeparateChainingHashTable(10)

m.put(1, 1)

del m[1]

m.put(1, 2)

self.assertEqual(2, m.get(1))

def test_add_entry_bigger_than_table_size(self):

m = SeparateChainingHashTable(10)

m.put(11, '1')

self.assertEqual('1', m.get(11))

def test_get_none_if_key_missing_and_hash_collision(self):

m = SeparateChainingHashTable(10)

m.put(1, '1')

self.assertEqual(None, m.get(11))

class TestWordPattern(unittest.TestCase):

def test_word_pattern(self):

self.assertTrue(word_pattern("abba", "dog cat cat dog"))

self.assertFalse(word_pattern("abba", "dog cat cat fish"))

self.assertFalse(word_pattern("abba", "dog dog dog dog"))

self.assertFalse(word_pattern("aaaa", "dog cat cat dog"))

class TestIsSomorphic(unittest.TestCase):

def test_is_isomorphic(self):

self.assertTrue(is_isomorphic("egg", "add"))

self.assertFalse(is_isomorphic("foo", "bar"))

self.assertTrue(is_isomorphic("paper", "title"))

class TestLongestPalindromicSubsequence(unittest.TestCase):

def test_longest_palindromic_subsequence_is_correct(self):

self.assertEqual(3,longest_palindromic_subsequence('BBABCBCAB'))

self.assertEqual(4,longest_palindromic_subsequence('abbaeae'))

self.assertEqual(7,longest_palindromic_subsequence('babbbababaa'))

self.assertEqual(4,longest_palindromic_subsequence('daccandeeja'))

def test_longest_palindromic_subsequence_is_incorrect(self):

self.assertNotEqual(4,longest_palindromic_subsequence('BBABCBCAB'))

self.assertNotEqual(5,longest_palindromic_subsequence('abbaeae'))

self.assertNotEqual(2,longest_palindromic_subsequence('babbbababaa'))

self.assertNotEqual(1,longest_palindromic_subsequence('daccandeeja'))

class TestIsAnagram(unittest.TestCase):

def test_is_anagram(self):

self.assertTrue(is_anagram("anagram", "nagaram"))

self.assertFalse(is_anagram("rat", "car"))

if __name__ == "__main__":

unittest.main()