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143 lines
3.8 KiB
Python
143 lines
3.8 KiB
Python
import unittest
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from sets import Set
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from test import test_support
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class G:
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'Sequence using __getitem__'
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def __init__(self, seqn):
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self.seqn = seqn
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def __getitem__(self, i):
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return self.seqn[i]
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class I:
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'Sequence using iterator protocol'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def __iter__(self):
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return self
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def next(self):
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if self.i >= len(self.seqn): raise StopIteration
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v = self.seqn[self.i]
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self.i += 1
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return v
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class Ig:
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'Sequence using iterator protocol defined with a generator'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def __iter__(self):
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for val in self.seqn:
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yield val
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class X:
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'Missing __getitem__ and __iter__'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def next(self):
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if self.i >= len(self.seqn): raise StopIteration
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v = self.seqn[self.i]
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self.i += 1
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return v
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class E:
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'Test propagation of exceptions'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def __iter__(self):
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return self
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def next(self):
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3/0
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class N:
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'Iterator missing next()'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def __iter__(self):
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return self
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class EnumerateTestCase(unittest.TestCase):
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enum = enumerate
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seq, res = 'abc', [(0,'a'), (1,'b'), (2,'c')]
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def test_basicfunction(self):
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self.assertEqual(type(self.enum(self.seq)), self.enum)
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e = self.enum(self.seq)
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self.assertEqual(iter(e), e)
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self.assertEqual(list(self.enum(self.seq)), self.res)
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self.enum.__doc__
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def test_getitemseqn(self):
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self.assertEqual(list(self.enum(G(self.seq))), self.res)
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e = self.enum(G(''))
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self.assertRaises(StopIteration, e.next)
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def test_iteratorseqn(self):
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self.assertEqual(list(self.enum(I(self.seq))), self.res)
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e = self.enum(I(''))
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self.assertRaises(StopIteration, e.next)
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def test_iteratorgenerator(self):
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self.assertEqual(list(self.enum(Ig(self.seq))), self.res)
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e = self.enum(Ig(''))
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self.assertRaises(StopIteration, e.next)
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def test_noniterable(self):
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self.assertRaises(TypeError, self.enum, X(self.seq))
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def test_illformediterable(self):
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self.assertRaises(TypeError, list, self.enum(N(self.seq)))
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def test_exception_propagation(self):
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self.assertRaises(ZeroDivisionError, list, self.enum(E(self.seq)))
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def test_argumentcheck(self):
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self.assertRaises(TypeError, self.enum) # no arguments
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self.assertRaises(TypeError, self.enum, 1) # wrong type (not iterable)
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self.assertRaises(TypeError, self.enum, 'abc', 2) # too many arguments
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def test_tuple_reuse(self):
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# Tests an implementation detail where tuple is reused
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# whenever nothing else holds a reference to it
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self.assertEqual(len(Set(map(id, list(self.seq)))), len(self.seq))
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self.assertEqual(len(Set(map(id, enumerate(self.seq)))), min(1,len(self.seq)))
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class MyEnum(enumerate):
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pass
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class SubclassTestCase(EnumerateTestCase):
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enum = MyEnum
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class TestEmpty(EnumerateTestCase):
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seq, res = '', []
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class TestBig(EnumerateTestCase):
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seq = range(10,20000,2)
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res = zip(range(20000), seq)
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def test_main(verbose=None):
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testclasses = (EnumerateTestCase, SubclassTestCase, TestEmpty, TestBig)
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test_support.run_unittest(*testclasses)
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# verify reference counting
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import sys
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if verbose and hasattr(sys, "gettotalrefcount"):
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counts = [None] * 5
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for i in xrange(len(counts)):
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test_support.run_unittest(*testclasses)
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counts[i] = sys.gettotalrefcount()
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print counts
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if __name__ == "__main__":
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test_main(verbose=True)
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