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bpo-35798: Add test.support.check_syntax_warning(). (#11895)

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It checks that a SyntaxWarning is raised when compile specified
statement, that it is raised only once, that it is converted to
a SyntaxError when raised as exception, and that both warning and
exception objects have corresponding attributes.
This commit is contained in:
Serhiy Storchaka 2019-02-19 08:30:15 +02:00 • committed by GitHub
parent ee0f927bd8
commit e7a4bb554e
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5 changed files with 62 additions and 55 deletions
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32
Lib/test/test_grammar.py
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@ -1,7 +1,7 @@
# Python test set -- part 1, grammar.
# This just tests whether the parser accepts them all.
from test.support import check_syntax_error
from test.support import check_syntax_error, check_syntax_warning
import inspect
import unittest
import sys
@ -101,7 +101,7 @@ INVALID_UNDERSCORE_LITERALS = [
class TokenTests(unittest.TestCase):
check_syntax_error = check_syntax_error
from test.support import check_syntax_error
def test_backslash(self):
# Backslash means line continuation:
@ -276,7 +276,7 @@ class CNS:
class GrammarTests(unittest.TestCase):
check_syntax_error = check_syntax_error
from test.support import check_syntax_error, check_syntax_warning
# single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE
# XXX can't test in a script -- this rule is only used when interactive
@ -1109,12 +1109,10 @@ class GrammarTests(unittest.TestCase):
else:
self.fail("AssertionError not raised by 'assert False'")
with self.assertWarnsRegex(SyntaxWarning, 'assertion is always true'):
compile('assert(x, "msg")', '<testcase>', 'exec')
self.check_syntax_warning('assert(x, "msg")',
'assertion is always true')
with warnings.catch_warnings():
warnings.filterwarnings('error', category=SyntaxWarning)
with self.assertRaisesRegex(SyntaxError, 'assertion is always true'):
compile('assert(x, "msg")', '<testcase>', 'exec')
warnings.simplefilter('error', SyntaxWarning)
compile('assert x, "msg"', '<testcase>', 'exec')
@ -1243,12 +1241,7 @@ class GrammarTests(unittest.TestCase):
def test_comparison_is_literal(self):
def check(test, msg='"is" with a literal'):
with self.assertWarnsRegex(SyntaxWarning, msg):
compile(test, '<testcase>', 'exec')
with warnings.catch_warnings():
warnings.filterwarnings('error', category=SyntaxWarning)
with self.assertRaisesRegex(SyntaxError, msg):
compile(test, '<testcase>', 'exec')
self.check_syntax_warning(test, msg)
check('x is 1')
check('x is "thing"')
@ -1257,7 +1250,7 @@ class GrammarTests(unittest.TestCase):
check('x is not 1', '"is not" with a literal')
with warnings.catch_warnings():
warnings.filterwarnings('error', category=SyntaxWarning)
warnings.simplefilter('error', SyntaxWarning)
compile('x is None', '<testcase>', 'exec')
compile('x is False', '<testcase>', 'exec')
compile('x is True', '<testcase>', 'exec')
@ -1265,12 +1258,7 @@ class GrammarTests(unittest.TestCase):
def test_warn_missed_comma(self):
def check(test):
with self.assertWarnsRegex(SyntaxWarning, msg):
compile(test, '<testcase>', 'exec')
with warnings.catch_warnings():
warnings.filterwarnings('error', category=SyntaxWarning)
with self.assertRaisesRegex(SyntaxError, msg):
compile(test, '<testcase>', 'exec')
self.check_syntax_warning(test, msg)
msg=r'is not callable; perhaps you missed a comma\?'
check('[(1, 2) (3, 4)]')
@ -1342,7 +1330,7 @@ class GrammarTests(unittest.TestCase):
check('[[1, 2] [...]]')
with warnings.catch_warnings():
warnings.filterwarnings('error', category=SyntaxWarning)
warnings.simplefilter('error', SyntaxWarning)
compile('[(lambda x, y: x) (3, 4)]', '<testcase>', 'exec')
compile('[[1, 2] [i]]', '<testcase>', 'exec')
compile('[[1, 2] [0]]', '<testcase>', 'exec')