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1# Test various flavors of legal and illegal future statements
2
3import unittest
4from test import test_support
5import re
6
7rx = re.compile('\((\S+).py, line (\d+)')
8
9def get_error_location(msg):
10    mo = rx.search(str(msg))
11    return mo.group(1, 2)
12
13class 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
115def test_main():
116    test_support.run_unittest(FutureTest)
117
118if __name__ == "__main__":
119    test_main()
120