Guido van Rossum | 7dab242 | 2002-04-26 19:40:56 +0000 | [diff] [blame] | 1 | from __future__ import generators |
| 2 | import unittest |
| 3 | |
| 4 | import test_support |
| 5 | |
| 6 | seq, res = 'abc', [(0,'a'), (1,'b'), (2,'c')] |
| 7 | |
| 8 | class G: |
| 9 | 'Sequence using __getitem__' |
| 10 | def __init__(self, seqn): |
| 11 | self.seqn = seqn |
| 12 | def __getitem__(self, i): |
| 13 | return self.seqn[i] |
| 14 | |
| 15 | class I: |
| 16 | 'Sequence using iterator protocol' |
| 17 | def __init__(self, seqn): |
| 18 | self.seqn = seqn |
| 19 | self.i = 0 |
| 20 | def __iter__(self): |
| 21 | return self |
| 22 | def next(self): |
| 23 | if self.i >= len(self.seqn): raise StopIteration |
| 24 | v = self.seqn[self.i] |
| 25 | self.i += 1 |
| 26 | return v |
| 27 | |
| 28 | class Ig: |
| 29 | 'Sequence using iterator protocol defined with a generator' |
| 30 | def __init__(self, seqn): |
| 31 | self.seqn = seqn |
| 32 | self.i = 0 |
| 33 | def __iter__(self): |
| 34 | for val in self.seqn: |
| 35 | yield val |
| 36 | |
| 37 | class X: |
| 38 | 'Missing __getitem__ and __iter__' |
| 39 | def __init__(self, seqn): |
| 40 | self.seqn = seqn |
| 41 | self.i = 0 |
| 42 | def next(self): |
| 43 | if self.i >= len(self.seqn): raise StopIteration |
| 44 | v = self.seqn[self.i] |
| 45 | self.i += 1 |
| 46 | return v |
| 47 | |
| 48 | class E: |
| 49 | 'Test propagation of exceptions' |
| 50 | def __init__(self, seqn): |
| 51 | self.seqn = seqn |
| 52 | self.i = 0 |
| 53 | def __iter__(self): |
| 54 | return self |
| 55 | def next(self): |
| 56 | 3/0 |
| 57 | |
| 58 | class N: |
| 59 | 'Iterator missing next()' |
| 60 | def __init__(self, seqn): |
| 61 | self.seqn = seqn |
| 62 | self.i = 0 |
| 63 | def __iter__(self): |
| 64 | return self |
| 65 | |
| 66 | class EnumerateTestCase(unittest.TestCase): |
| 67 | |
| 68 | enum = enumerate |
| 69 | |
| 70 | def test_basicfunction(self): |
| 71 | self.assertEqual(type(self.enum(seq)), self.enum) |
| 72 | e = self.enum(seq) |
| 73 | self.assertEqual(iter(e), e) |
| 74 | self.assertEqual(list(self.enum(seq)), res) |
| 75 | self.enum.__doc__ |
| 76 | |
| 77 | def test_getitemseqn(self): |
| 78 | self.assertEqual(list(self.enum(G(seq))), res) |
| 79 | e = self.enum(G('')) |
| 80 | self.assertRaises(StopIteration, e.next) |
| 81 | |
| 82 | def test_iteratorseqn(self): |
| 83 | self.assertEqual(list(self.enum(I(seq))), res) |
| 84 | e = self.enum(I('')) |
| 85 | self.assertRaises(StopIteration, e.next) |
| 86 | |
| 87 | def test_iteratorgenerator(self): |
| 88 | self.assertEqual(list(self.enum(Ig(seq))), res) |
| 89 | e = self.enum(Ig('')) |
| 90 | self.assertRaises(StopIteration, e.next) |
| 91 | |
| 92 | def test_noniterable(self): |
| 93 | self.assertRaises(TypeError, self.enum, X(seq)) |
| 94 | |
| 95 | def test_illformediterable(self): |
| 96 | self.assertRaises(TypeError, list, self.enum(N(seq))) |
| 97 | |
| 98 | def test_exception_propagation(self): |
| 99 | self.assertRaises(ZeroDivisionError, list, self.enum(E(seq))) |
| 100 | |
| 101 | class MyEnum(enumerate): |
| 102 | pass |
| 103 | |
| 104 | class SubclassTestCase(EnumerateTestCase): |
| 105 | |
| 106 | enum = MyEnum |
| 107 | |
| 108 | def suite(): |
| 109 | suite = unittest.TestSuite() |
| 110 | suite.addTest(unittest.makeSuite(EnumerateTestCase)) |
| 111 | suite.addTest(unittest.makeSuite(SubclassTestCase)) |
| 112 | return suite |
| 113 | |
| 114 | def test_main(): |
| 115 | test_support.run_suite(suite()) |
| 116 | |
| 117 | if __name__ == "__main__": |
| 118 | test_main() |