Lib/test/test___future__.py

   1 #! /usr/bin/env python
   2 import unittest
   3 from test import test_support
   4 import __future__
   5
   6 GOOD_SERIALS = ("alpha", "beta", "candidate", "final")
   7
   8 features = __future__.all_feature_names
   9
  10 class 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.assertTrue(
  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.assertTrue
  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             # Make sure the compile accepts the flag.
  57             compile("", "<test>", "exec", value.compiler_flag)
  58             a(isinstance(getattr(value, "compiler_flag"), int),
  59                    ".compiler_flag isn't int")
  60
  61
  62 def test_main():
  63     test_support.run_unittest(FutureTest)
  64
  65 if __name__ == "__main__":
  66     test_main()