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1"""Verify that warnings are issued for global statements following use."""
2
3from test.support import run_unittest, check_syntax_error, check_warnings
4import unittest
5import warnings
6
7
8class GlobalTests(unittest.TestCase):
9
10    def setUp(self):
11        self._warnings_manager = check_warnings()
12        self._warnings_manager.__enter__()
13        warnings.filterwarnings("error", module="<test string>")
14
15    def tearDown(self):
16        self._warnings_manager.__exit__(None, None, None)
17
18
19    def test1(self):
20        prog_text_1 = """\
21def wrong1():
22    a = 1
23    b = 2
24    global a
25    global b
26"""
27        check_syntax_error(self, prog_text_1, lineno=4, offset=4)
28
29    def test2(self):
30        prog_text_2 = """\
31def wrong2():
32    print(x)
33    global x
34"""
35        check_syntax_error(self, prog_text_2, lineno=3, offset=4)
36
37    def test3(self):
38        prog_text_3 = """\
39def wrong3():
40    print(x)
41    x = 2
42    global x
43"""
44        check_syntax_error(self, prog_text_3, lineno=4, offset=4)
45
46    def test4(self):
47        prog_text_4 = """\
48global x
49x = 2
50"""
51        # this should work
52        compile(prog_text_4, "<test string>", "exec")
53
54
55def test_main():
56    with warnings.catch_warnings():
57        warnings.filterwarnings("error", module="<test string>")
58        run_unittest(GlobalTests)
59
60if __name__ == "__main__":
61    test_main()
62