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Edit: /opt/gsutil/third_party/cachetools/tests/test_keys.py

import unittest

import cachetools.keys

class CacheKeysTest(unittest.TestCase):
    def test_hashkey(self, key=cachetools.keys.hashkey):
        self.assertEqual(key(), key())
        self.assertEqual(hash(key()), hash(key()))
        self.assertEqual(key(1, 2, 3), key(1, 2, 3))
        self.assertEqual(hash(key(1, 2, 3)), hash(key(1, 2, 3)))
        self.assertEqual(key(1, 2, 3, x=0), key(1, 2, 3, x=0))
        self.assertEqual(hash(key(1, 2, 3, x=0)), hash(key(1, 2, 3, x=0)))
        self.assertNotEqual(key(1, 2, 3), key(3, 2, 1))
        self.assertNotEqual(key(1, 2, 3), key(1, 2, 3, x=None))
        self.assertNotEqual(key(1, 2, 3, x=0), key(1, 2, 3, x=None))
        self.assertNotEqual(key(1, 2, 3, x=0), key(1, 2, 3, y=0))
        with self.assertRaises(TypeError):
            hash(key({}))
        # untyped keys compare equal
        self.assertEqual(key(1, 2, 3), key(1.0, 2.0, 3.0))
        self.assertEqual(hash(key(1, 2, 3)), hash(key(1.0, 2.0, 3.0)))

def methodkey(self, key=cachetools.keys.methodkey):
        # similar to hashkey(), but ignores its first positional argument
        self.assertEqual(key("x"), key("y"))
        self.assertEqual(hash(key("x")), hash(key("y")))
        self.assertEqual(key("x", 1, 2, 3), key("y", 1, 2, 3))
        self.assertEqual(hash(key("x", 1, 2, 3)), hash(key("y", 1, 2, 3)))
        self.assertEqual(key("x", 1, 2, 3, x=0), key("y", 1, 2, 3, x=0))
        self.assertEqual(hash(key("x", 1, 2, 3, x=0)), hash(key("y", 1, 2, 3, x=0)))
        self.assertNotEqual(key("x", 1, 2, 3), key("x", 3, 2, 1))
        self.assertNotEqual(key("x", 1, 2, 3), key("x", 1, 2, 3, x=None))
        self.assertNotEqual(key("x", 1, 2, 3, x=0), key("x", 1, 2, 3, x=None))
        self.assertNotEqual(key("x", 1, 2, 3, x=0), key("x", 1, 2, 3, y=0))
        with self.assertRaises(TypeError):
            hash("x", key({}))
        # untyped keys compare equal
        self.assertEqual(key("x", 1, 2, 3), key("y", 1.0, 2.0, 3.0))
        self.assertEqual(hash(key("x", 1, 2, 3)), hash(key("y", 1.0, 2.0, 3.0)))

def test_typedkey(self, key=cachetools.keys.typedkey):
        self.assertEqual(key(), key())
        self.assertEqual(hash(key()), hash(key()))
        self.assertEqual(key(1, 2, 3), key(1, 2, 3))
        self.assertEqual(hash(key(1, 2, 3)), hash(key(1, 2, 3)))
        self.assertEqual(key(1, 2, 3, x=0), key(1, 2, 3, x=0))
        self.assertEqual(hash(key(1, 2, 3, x=0)), hash(key(1, 2, 3, x=0)))
        self.assertNotEqual(key(1, 2, 3), key(3, 2, 1))
        self.assertNotEqual(key(1, 2, 3), key(1, 2, 3, x=None))
        self.assertNotEqual(key(1, 2, 3, x=0), key(1, 2, 3, x=None))
        self.assertNotEqual(key(1, 2, 3, x=0), key(1, 2, 3, y=0))
        with self.assertRaises(TypeError):
            hash(key({}))
        # typed keys compare unequal
        self.assertNotEqual(key(1, 2, 3), key(1.0, 2.0, 3.0))

def test_typedmethodkey(self, key=cachetools.keys.typedmethodkey):
        # similar to typedkey(), but ignores its first positional argument
        self.assertEqual(key("x"), key("y"))
        self.assertEqual(hash(key("x")), hash(key("y")))
        self.assertEqual(key("x", 1, 2, 3), key("y", 1, 2, 3))
        self.assertEqual(hash(key("x", 1, 2, 3)), hash(key("y", 1, 2, 3)))
        self.assertEqual(key("x", 1, 2, 3, x=0), key("y", 1, 2, 3, x=0))
        self.assertEqual(hash(key("x", 1, 2, 3, x=0)), hash(key("y", 1, 2, 3, x=0)))
        self.assertNotEqual(key("x", 1, 2, 3), key("x", 3, 2, 1))
        self.assertNotEqual(key("x", 1, 2, 3), key("x", 1, 2, 3, x=None))
        self.assertNotEqual(key("x", 1, 2, 3, x=0), key("x", 1, 2, 3, x=None))
        self.assertNotEqual(key("x", 1, 2, 3, x=0), key("x", 1, 2, 3, y=0))
        with self.assertRaises(TypeError):
            hash(key("x", {}))
        # typed keys compare unequal
        self.assertNotEqual(key("x", 1, 2, 3), key("x", 1.0, 2.0, 3.0))

def test_addkeys(self, key=cachetools.keys.hashkey):
        self.assertIsInstance(key(), tuple)
        self.assertIsInstance(key(1, 2, 3) + key(4, 5, 6), type(key()))
        self.assertIsInstance(key(1, 2, 3) + (4, 5, 6), type(key()))
        self.assertIsInstance((1, 2, 3) + key(4, 5, 6), type(key()))

def test_pickle(self, key=cachetools.keys.hashkey):
        import pickle

for k in [key(), key("abc"), key("abc", 123), key("abc", q="abc")]:
            # white-box test: assert cached hash value is not pickled
            self.assertEqual(len(k.__dict__), 0)
            h = hash(k)
            self.assertEqual(len(k.__dict__), 1)
            pickled = pickle.loads(pickle.dumps(k))
            self.assertEqual(len(pickled.__dict__), 0)
            self.assertEqual(k, pickled)
            self.assertEqual(h, hash(pickled))

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