author | Gregory Szorc <gregory.szorc@gmail.com> |
Thu, 03 Mar 2022 17:34:00 +0100 | |
changeset 48875 | 6000f5b25c9b |
parent 43076 | 2372284d9457 |
permissions | -rw-r--r-- |
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import unittest |
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import silenttestrunner |
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formatting: blacken the codebase
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from mercurial import util |
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class testlrucachedict(unittest.TestCase): |
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def testsimple(self): |
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d = util.lrucachedict(4) |
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self.assertEqual(d.capacity, 4) |
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d.insert('a', 'va', cost=2) |
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d['b'] = 'vb' |
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d['c'] = 'vc' |
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d.insert('d', 'vd', cost=42) |
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self.assertEqual(d['a'], 'va') |
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self.assertEqual(d['b'], 'vb') |
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self.assertEqual(d['c'], 'vc') |
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self.assertEqual(d['d'], 'vd') |
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self.assertEqual(d.totalcost, 44) |
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# 'a' should be dropped because it was least recently used. |
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d['e'] = 've' |
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self.assertNotIn('a', d) |
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self.assertIsNone(d.get('a')) |
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self.assertEqual(d.totalcost, 42) |
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self.assertEqual(d['b'], 'vb') |
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self.assertEqual(d['c'], 'vc') |
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self.assertEqual(d['d'], 'vd') |
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self.assertEqual(d['e'], 've') |
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# Replacing item with different cost adjusts totalcost. |
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d.insert('e', 've', cost=4) |
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self.assertEqual(d.totalcost, 46) |
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# Touch entries in some order (both get and set). |
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d['e'] |
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d['c'] = 'vc2' |
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d['d'] |
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d['b'] = 'vb2' |
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# 'e' should be dropped now |
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d['f'] = 'vf' |
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self.assertNotIn('e', d) |
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self.assertEqual(d['b'], 'vb2') |
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self.assertEqual(d['c'], 'vc2') |
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self.assertEqual(d['d'], 'vd') |
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self.assertEqual(d['f'], 'vf') |
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d.clear() |
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for key in ('a', 'b', 'c', 'd', 'e', 'f'): |
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self.assertNotIn(key, d) |
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def testunfull(self): |
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d = util.lrucachedict(4) |
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d['a'] = 1 |
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d['b'] = 2 |
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d['a'] |
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d['b'] |
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for key in ('a', 'b'): |
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self.assertIn(key, d) |
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def testget(self): |
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d = util.lrucachedict(4) |
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d['a'] = 'va' |
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d['b'] = 'vb' |
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d['c'] = 'vc' |
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self.assertIsNone(d.get('missing')) |
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self.assertEqual(list(d), ['c', 'b', 'a']) |
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self.assertEqual(d.get('a'), 'va') |
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self.assertEqual(list(d), ['a', 'c', 'b']) |
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def testpeek(self): |
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d = util.lrucachedict(4) |
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d['a'] = 'va' |
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d['b'] = 'vb' |
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d['c'] = 'vc' |
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with self.assertRaises(KeyError): |
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d.peek('missing') |
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self.assertEqual(list(d), ['c', 'b', 'a']) |
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self.assertIsNone(d.peek('missing', None)) |
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self.assertEqual(list(d), ['c', 'b', 'a']) |
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self.assertEqual(d.peek('a'), 'va') |
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self.assertEqual(list(d), ['c', 'b', 'a']) |
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def testpop(self): |
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d = util.lrucachedict(4) |
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d['a'] = 'va' |
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d['b'] = 'vb' |
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d['c'] = 'vc' |
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with self.assertRaises(KeyError): |
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d.pop('missing') |
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self.assertEqual(list(d), ['c', 'b', 'a']) |
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self.assertIsNone(d.pop('missing', None)) |
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self.assertEqual(list(d), ['c', 'b', 'a']) |
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self.assertEqual(d.pop('b'), 'vb') |
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self.assertEqual(list(d), ['c', 'a']) |
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def testcopypartial(self): |
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d = util.lrucachedict(4) |
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d.insert('a', 'va', cost=4) |
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d.insert('b', 'vb', cost=2) |
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dc = d.copy() |
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self.assertEqual(len(dc), 2) |
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self.assertEqual(dc.totalcost, 6) |
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for key in ('a', 'b'): |
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self.assertIn(key, dc) |
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self.assertEqual(dc[key], 'v%s' % key) |
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self.assertEqual(len(d), 2) |
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for key in ('a', 'b'): |
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self.assertIn(key, d) |
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self.assertEqual(d[key], 'v%s' % key) |
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d['c'] = 'vc' |
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del d['b'] |
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self.assertEqual(d.totalcost, 4) |
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dc = d.copy() |
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self.assertEqual(len(dc), 2) |
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self.assertEqual(dc.totalcost, 4) |
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for key in ('a', 'c'): |
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self.assertIn(key, dc) |
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self.assertEqual(dc[key], 'v%s' % key) |
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def testcopyempty(self): |
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d = util.lrucachedict(4) |
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dc = d.copy() |
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self.assertEqual(len(dc), 0) |
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def testcopyfull(self): |
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d = util.lrucachedict(4) |
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d.insert('a', 'va', cost=42) |
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d['b'] = 'vb' |
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d['c'] = 'vc' |
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d['d'] = 'vd' |
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dc = d.copy() |
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for key in ('a', 'b', 'c', 'd'): |
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self.assertIn(key, dc) |
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self.assertEqual(dc[key], 'v%s' % key) |
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self.assertEqual(d.totalcost, 42) |
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self.assertEqual(dc.totalcost, 42) |
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# 'a' should be dropped because it was least recently used. |
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dc['e'] = 've' |
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self.assertNotIn('a', dc) |
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for key in ('b', 'c', 'd', 'e'): |
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self.assertIn(key, dc) |
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self.assertEqual(dc[key], 'v%s' % key) |
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|
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self.assertEqual(d.totalcost, 42) |
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self.assertEqual(dc.totalcost, 0) |
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|
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# Contents and order of original dict should remain unchanged. |
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dc['b'] = 'vb_new' |
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|
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self.assertEqual(list(iter(d)), ['d', 'c', 'b', 'a']) |
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for key in ('a', 'b', 'c', 'd'): |
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self.assertEqual(d[key], 'v%s' % key) |
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|
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d = util.lrucachedict(4, maxcost=42) |
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d.insert('a', 'va', cost=5) |
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d.insert('b', 'vb', cost=4) |
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d.insert('c', 'vc', cost=3) |
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dc = d.copy() |
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self.assertEqual(dc.maxcost, 42) |
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self.assertEqual(len(dc), 3) |
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|
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# Max cost can be lowered as part of copy. |
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dc = d.copy(maxcost=10) |
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self.assertEqual(dc.maxcost, 10) |
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self.assertEqual(len(dc), 2) |
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self.assertEqual(dc.totalcost, 7) |
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self.assertIn('b', dc) |
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self.assertIn('c', dc) |
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def testcopydecreasecapacity(self): |
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d = util.lrucachedict(5) |
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d.insert('a', 'va', cost=4) |
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d.insert('b', 'vb', cost=2) |
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d['c'] = 'vc' |
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d['d'] = 'vd' |
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|
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dc = d.copy(2) |
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self.assertEqual(dc.totalcost, 0) |
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for key in ('a', 'b'): |
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self.assertNotIn(key, dc) |
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for key in ('c', 'd'): |
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self.assertIn(key, dc) |
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self.assertEqual(dc[key], 'v%s' % key) |
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dc.insert('e', 've', cost=7) |
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self.assertEqual(dc.totalcost, 7) |
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self.assertNotIn('c', dc) |
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for key in ('d', 'e'): |
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self.assertIn(key, dc) |
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self.assertEqual(dc[key], 'v%s' % key) |
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|
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# Original should remain unchanged. |
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self.assertEqual(d.totalcost, 6) |
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for key in ('a', 'b', 'c', 'd'): |
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self.assertIn(key, d) |
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self.assertEqual(d[key], 'v%s' % key) |
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def testcopyincreasecapacity(self): |
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d = util.lrucachedict(5) |
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d['a'] = 'va' |
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d['b'] = 'vb' |
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d['c'] = 'vc' |
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d['d'] = 'vd' |
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|
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dc = d.copy(6) |
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for key in ('a', 'b', 'c', 'd'): |
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self.assertIn(key, dc) |
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self.assertEqual(dc[key], 'v%s' % key) |
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dc['e'] = 've' |
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dc['f'] = 'vf' |
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for key in ('a', 'b', 'c', 'd', 'e', 'f'): |
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self.assertIn(key, dc) |
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self.assertEqual(dc[key], 'v%s' % key) |
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|
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dc['g'] = 'vg' |
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self.assertNotIn('a', dc) |
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for key in ('b', 'c', 'd', 'e', 'f', 'g'): |
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self.assertIn(key, dc) |
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self.assertEqual(dc[key], 'v%s' % key) |
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|
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# Original should remain unchanged. |
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for key in ('a', 'b', 'c', 'd'): |
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self.assertIn(key, d) |
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self.assertEqual(d[key], 'v%s' % key) |
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def testpopoldest(self): |
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d = util.lrucachedict(4) |
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d.insert('a', 'va', cost=10) |
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d.insert('b', 'vb', cost=5) |
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self.assertEqual(len(d), 2) |
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self.assertEqual(d.popoldest(), ('a', 'va')) |
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self.assertEqual(len(d), 1) |
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self.assertEqual(d.totalcost, 5) |
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self.assertEqual(d.popoldest(), ('b', 'vb')) |
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self.assertEqual(len(d), 0) |
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self.assertEqual(d.totalcost, 0) |
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self.assertIsNone(d.popoldest()) |
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|
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d['a'] = 'va' |
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d['b'] = 'vb' |
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d['c'] = 'vc' |
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d['d'] = 'vd' |
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self.assertEqual(d.popoldest(), ('a', 'va')) |
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self.assertEqual(len(d), 3) |
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for key in ('b', 'c', 'd'): |
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self.assertEqual(d[key], 'v%s' % key) |
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d['a'] = 'va' |
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self.assertEqual(d.popoldest(), ('b', 'vb')) |
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def testmaxcost(self): |
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# Item cost is zero by default. |
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d = util.lrucachedict(6, maxcost=10) |
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d['a'] = 'va' |
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d['b'] = 'vb' |
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d['c'] = 'vc' |
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d['d'] = 'vd' |
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self.assertEqual(len(d), 4) |
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self.assertEqual(d.totalcost, 0) |
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d.clear() |
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|
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# Insertion to exact cost threshold works without eviction. |
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d.insert('a', 'va', cost=6) |
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d.insert('b', 'vb', cost=4) |
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self.assertEqual(len(d), 2) |
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self.assertEqual(d['a'], 'va') |
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self.assertEqual(d['b'], 'vb') |
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# Inserting a new element with 0 cost works. |
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d['c'] = 'vc' |
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self.assertEqual(len(d), 3) |
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# Inserting a new element with cost putting us above high |
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# water mark evicts oldest single item. |
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d.insert('d', 'vd', cost=1) |
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self.assertEqual(len(d), 3) |
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self.assertEqual(d.totalcost, 5) |
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self.assertNotIn('a', d) |
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for key in ('b', 'c', 'd'): |
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self.assertEqual(d[key], 'v%s' % key) |
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# Inserting a new element with enough room for just itself |
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# evicts all items before. |
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d.insert('e', 've', cost=10) |
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self.assertEqual(len(d), 1) |
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self.assertEqual(d.totalcost, 10) |
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self.assertIn('e', d) |
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# Inserting a new element with cost greater than threshold |
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# still retains that item. |
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d.insert('f', 'vf', cost=11) |
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self.assertEqual(len(d), 1) |
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self.assertEqual(d.totalcost, 11) |
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self.assertIn('f', d) |
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# Inserting a new element will evict the last item since it is |
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# too large. |
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d['g'] = 'vg' |
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self.assertEqual(len(d), 1) |
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self.assertEqual(d.totalcost, 0) |
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self.assertIn('g', d) |
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d.clear() |
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d.insert('a', 'va', cost=7) |
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d.insert('b', 'vb', cost=3) |
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self.assertEqual(len(d), 2) |
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# Replacing a value with smaller cost won't result in eviction. |
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d.insert('b', 'vb2', cost=2) |
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self.assertEqual(len(d), 2) |
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# Replacing a value with a higher cost will evict when threshold |
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# exceeded. |
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d.insert('b', 'vb3', cost=4) |
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self.assertEqual(len(d), 1) |
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self.assertNotIn('a', d) |
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def testmaxcostcomplex(self): |
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d = util.lrucachedict(100, maxcost=100) |
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d.insert('a', 'va', cost=9) |
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d.insert('b', 'vb', cost=21) |
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d.insert('c', 'vc', cost=7) |
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d.insert('d', 'vc', cost=50) |
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self.assertEqual(d.totalcost, 87) |
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# Inserting new element should free multiple elements so we hit |
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# low water mark. |
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d.insert('e', 'vd', cost=25) |
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self.assertEqual(len(d), 2) |
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self.assertNotIn('a', d) |
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self.assertNotIn('b', d) |
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self.assertNotIn('c', d) |
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self.assertIn('d', d) |
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self.assertIn('e', d) |
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if __name__ == '__main__': |
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silenttestrunner.main(__name__) |