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Check that failed writerow() doesn't produce change a file.

This commit is contained in:
Serhiy Storchaka 2015-03-25 19:16:15 +02:00
parent 1b87ae0c91
commit 0b4e355b8e
1 changed files with 16 additions and 14 deletions
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30
Lib/test/test_csv.py
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@ -124,12 +124,19 @@ class Test_Csv(unittest.TestCase):
self.assertEqual(fileobj.read(),
expect + writer.dialect.lineterminator)
def _write_error_test(self, exc, fields, **kwargs):
with TemporaryFile("w+", newline='') as fileobj:
writer = csv.writer(fileobj, **kwargs)
with self.assertRaises(exc):
writer.writerow(fields)
fileobj.seek(0)
self.assertEqual(fileobj.read(), '')
def test_write_arg_valid(self):
self.assertRaises(csv.Error, self._write_test, None, '')
self._write_error_test(csv.Error, None)
self._write_test((), '')
self._write_test([None], '""')
self.assertRaises(csv.Error, self._write_test,
[None], None, quoting = csv.QUOTE_NONE)
self._write_error_test(csv.Error, [None], quoting = csv.QUOTE_NONE)
# Check that exceptions are passed up the chain
class BadList:
def __len__(self):
@ -137,11 +144,11 @@ class Test_Csv(unittest.TestCase):
def __getitem__(self, i):
if i > 2:
raise OSError
self.assertRaises(OSError, self._write_test, BadList(), '')
self._write_error_test(OSError, BadList())
class BadItem:
def __str__(self):
raise OSError
self.assertRaises(OSError, self._write_test, [BadItem()], '')
self._write_error_test(OSError, [BadItem()])
def test_write_bigfield(self):
# This exercises the buffer realloc functionality
@ -151,10 +158,8 @@ class Test_Csv(unittest.TestCase):
def test_write_quoting(self):
self._write_test(['a',1,'p,q'], 'a,1,"p,q"')
self.assertRaises(csv.Error,
self._write_test,
['a',1,'p,q'], 'a,1,p,q',
quoting = csv.QUOTE_NONE)
self._write_error_test(csv.Error, ['a',1,'p,q'],
quoting = csv.QUOTE_NONE)
self._write_test(['a',1,'p,q'], 'a,1,"p,q"',
quoting = csv.QUOTE_MINIMAL)
self._write_test(['a',1,'p,q'], '"a",1,"p,q"',
@ -167,10 +172,8 @@ class Test_Csv(unittest.TestCase):
def test_write_escape(self):
self._write_test(['a',1,'p,q'], 'a,1,"p,q"',
escapechar='\\')
self.assertRaises(csv.Error,
self._write_test,
['a',1,'p,"q"'], 'a,1,"p,\\"q\\""',
escapechar=None, doublequote=False)
self._write_error_test(csv.Error, ['a',1,'p,"q"'],
escapechar=None, doublequote=False)
self._write_test(['a',1,'p,"q"'], 'a,1,"p,\\"q\\""',
escapechar='\\', doublequote = False)
self._write_test(['"'], '""""',
@ -1063,7 +1066,6 @@ class TestUnicode(unittest.TestCase):
self.assertEqual(fileobj.read(), expected)
def test_main():
mod = sys.modules[__name__]
support.run_unittest(