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      1 # Test various flavors of legal and illegal future statements
      2 
      3 import unittest
      4 from test import test_support
      5 import re
      6 
      7 rx = re.compile('\((\S+).py, line (\d+)')
      8 
      9 def get_error_location(msg):
     10     mo = rx.search(str(msg))
     11     return mo.group(1, 2)
     12 
     13 class FutureTest(unittest.TestCase):
     14 
     15     def test_future1(self):
     16         test_support.unload('test_future1')
     17         from test import test_future1
     18         self.assertEqual(test_future1.result, 6)
     19 
     20     def test_future2(self):
     21         test_support.unload('test_future2')
     22         from test import test_future2
     23         self.assertEqual(test_future2.result, 6)
     24 
     25     def test_future3(self):
     26         test_support.unload('test_future3')
     27         from test import test_future3
     28 
     29     def test_badfuture3(self):
     30         try:
     31             from test import badsyntax_future3
     32         except SyntaxError, msg:
     33             self.assertEqual(get_error_location(msg), ("badsyntax_future3", '3'))
     34         else:
     35             self.fail("expected exception didn't occur")
     36 
     37     def test_badfuture4(self):
     38         try:
     39             from test import badsyntax_future4
     40         except SyntaxError, msg:
     41             self.assertEqual(get_error_location(msg), ("badsyntax_future4", '3'))
     42         else:
     43             self.fail("expected exception didn't occur")
     44 
     45     def test_badfuture5(self):
     46         try:
     47             from test import badsyntax_future5
     48         except SyntaxError, msg:
     49             self.assertEqual(get_error_location(msg), ("badsyntax_future5", '4'))
     50         else:
     51             self.fail("expected exception didn't occur")
     52 
     53     def test_badfuture6(self):
     54         try:
     55             from test import badsyntax_future6
     56         except SyntaxError, msg:
     57             self.assertEqual(get_error_location(msg), ("badsyntax_future6", '3'))
     58         else:
     59             self.fail("expected exception didn't occur")
     60 
     61     def test_badfuture7(self):
     62         try:
     63             from test import badsyntax_future7
     64         except SyntaxError, msg:
     65             self.assertEqual(get_error_location(msg), ("badsyntax_future7", '3'))
     66         else:
     67             self.fail("expected exception didn't occur")
     68 
     69     def test_badfuture8(self):
     70         try:
     71             from test import badsyntax_future8
     72         except SyntaxError, msg:
     73             self.assertEqual(get_error_location(msg), ("badsyntax_future8", '3'))
     74         else:
     75             self.fail("expected exception didn't occur")
     76 
     77     def test_badfuture9(self):
     78         try:
     79             from test import badsyntax_future9
     80         except SyntaxError, msg:
     81             self.assertEqual(get_error_location(msg), ("badsyntax_future9", '3'))
     82         else:
     83             self.fail("expected exception didn't occur")
     84 
     85     def test_parserhack(self):
     86         # test that the parser.c::future_hack function works as expected
     87         # Note: although this test must pass, it's not testing the original
     88         #       bug as of 2.6 since the with statement is not optional and
     89         #       the parser hack disabled. If a new keyword is introduced in
     90         #       2.6, change this to refer to the new future import.
     91         try:
     92             exec "from __future__ import print_function; print 0"
     93         except SyntaxError:
     94             pass
     95         else:
     96             self.fail("syntax error didn't occur")
     97 
     98         try:
     99             exec "from __future__ import (print_function); print 0"
    100         except SyntaxError:
    101             pass
    102         else:
    103             self.fail("syntax error didn't occur")
    104 
    105     def test_multiple_features(self):
    106         test_support.unload("test.test_future5")
    107         from test import test_future5
    108 
    109     def test_unicode_literals_exec(self):
    110         scope = {}
    111         exec "from __future__ import unicode_literals; x = ''" in scope
    112         self.assertIsInstance(scope["x"], unicode)
    113 
    114 
    115 def test_main():
    116     test_support.run_unittest(FutureTest)
    117 
    118 if __name__ == "__main__":
    119     test_main()
    120