/Lib/test/test___future__.py

 1#! /usr/bin/env python
 2import unittest
 3from test import test_support
 4import __future__
 5
 6GOOD_SERIALS = ("alpha", "beta", "candidate", "final")
 7
 8features = __future__.all_feature_names
 9
10class FutureTest(unittest.TestCase):
11
12    def test_names(self):
13        # Verify that all_feature_names appears correct.
14        given_feature_names = features[:]
15        for name in dir(__future__):
16            obj = getattr(__future__, name, None)
17            if obj is not None and isinstance(obj, __future__._Feature):
18                self.assert_(
19                    name in given_feature_names,
20                    "%r should have been in all_feature_names" % name
21                )
22                given_feature_names.remove(name)
23        self.assertEqual(len(given_feature_names), 0,
24               "all_feature_names has too much: %r" % given_feature_names)
25
26    def test_attributes(self):
27        for feature in features:
28            value = getattr(__future__, feature)
29
30            optional = value.getOptionalRelease()
31            mandatory = value.getMandatoryRelease()
32
33            a = self.assert_
34            e = self.assertEqual
35            def check(t, name):
36                a(isinstance(t, tuple), "%s isn't tuple" % name)
37                e(len(t), 5, "%s isn't 5-tuple" % name)
38                (major, minor, micro, level, serial) = t
39                a(isinstance(major, int), "%s major isn't int"  % name)
40                a(isinstance(minor, int), "%s minor isn't int" % name)
41                a(isinstance(micro, int), "%s micro isn't int" % name)
42                a(isinstance(level, basestring),
43                    "%s level isn't string" % name)
44                a(level in GOOD_SERIALS,
45                       "%s level string has unknown value" % name)
46                a(isinstance(serial, int), "%s serial isn't int" % name)
47
48            check(optional, "optional")
49            if mandatory is not None:
50                check(mandatory, "mandatory")
51                a(optional < mandatory,
52                       "optional not less than mandatory, and mandatory not None")
53
54            a(hasattr(value, "compiler_flag"),
55                   "feature is missing a .compiler_flag attr")
56            a(isinstance(getattr(value, "compiler_flag"), int),
57                   ".compiler_flag isn't int")
58
59def test_main():
60    test_support.run_unittest(FutureTest)
61
62if __name__ == "__main__":
63    test_main()