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✏️ test_future.py

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# Test various flavors of legal and illegal future statements

import unittest
from test import test_support
import re

rx = re.compile('\((\S+).py, line (\d+)')

def get_error_location(msg):
    mo = rx.search(str(msg))
    return mo.group(1, 2)

class FutureTest(unittest.TestCase):

def test_future1(self):
        test_support.unload('test_future1')
        from test import test_future1
        self.assertEqual(test_future1.result, 6)

def test_future2(self):
        test_support.unload('test_future2')
        from test import test_future2
        self.assertEqual(test_future2.result, 6)

def test_future3(self):
        test_support.unload('test_future3')
        from test import test_future3

def test_badfuture3(self):
        try:
            from test import badsyntax_future3
        except SyntaxError, msg:
            self.assertEqual(get_error_location(msg), ("badsyntax_future3", '3'))
        else:
            self.fail("expected exception didn't occur")

def test_badfuture4(self):
        try:
            from test import badsyntax_future4
        except SyntaxError, msg:
            self.assertEqual(get_error_location(msg), ("badsyntax_future4", '3'))
        else:
            self.fail("expected exception didn't occur")

def test_badfuture5(self):
        try:
            from test import badsyntax_future5
        except SyntaxError, msg:
            self.assertEqual(get_error_location(msg), ("badsyntax_future5", '4'))
        else:
            self.fail("expected exception didn't occur")

def test_badfuture6(self):
        try:
            from test import badsyntax_future6
        except SyntaxError, msg:
            self.assertEqual(get_error_location(msg), ("badsyntax_future6", '3'))
        else:
            self.fail("expected exception didn't occur")

def test_badfuture7(self):
        try:
            from test import badsyntax_future7
        except SyntaxError, msg:
            self.assertEqual(get_error_location(msg), ("badsyntax_future7", '3'))
        else:
            self.fail("expected exception didn't occur")

def test_badfuture8(self):
        try:
            from test import badsyntax_future8
        except SyntaxError, msg:
            self.assertEqual(get_error_location(msg), ("badsyntax_future8", '3'))
        else:
            self.fail("expected exception didn't occur")

def test_badfuture9(self):
        try:
            from test import badsyntax_future9
        except SyntaxError, msg:
            self.assertEqual(get_error_location(msg), ("badsyntax_future9", '3'))
        else:
            self.fail("expected exception didn't occur")

def test_parserhack(self):
        # test that the parser.c::future_hack function works as expected
        # Note: although this test must pass, it's not testing the original
        #       bug as of 2.6 since the with statement is not optional and
        #       the parser hack disabled. If a new keyword is introduced in
        #       2.6, change this to refer to the new future import.
        try:
            exec "from __future__ import print_function; print 0"
        except SyntaxError:
            pass
        else:
            self.fail("syntax error didn't occur")

try:
            exec "from __future__ import (print_function); print 0"
        except SyntaxError:
            pass
        else:
            self.fail("syntax error didn't occur")

def test_multiple_features(self):
        test_support.unload("test.test_future5")
        from test import test_future5

def test_unicode_literals_exec(self):
        scope = {}
        exec "from __future__ import unicode_literals; x = ''" in scope
        self.assertIsInstance(scope["x"], unicode)

def test_main():
    test_support.run_unittest(FutureTest)

if __name__ == "__main__":
    test_main()

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✏️ test_future.py