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Diffstat (limited to 'Lib/test/test_csv.py')
| -rw-r--r-- | Lib/test/test_csv.py | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/Lib/test/test_csv.py b/Lib/test/test_csv.py index 03ab1840dd0..fe248019a0f 100644 --- a/Lib/test/test_csv.py +++ b/Lib/test/test_csv.py @@ -207,10 +207,29 @@ class Test_Csv(unittest.TestCase): with TemporaryFile("w+", newline='') as fileobj: writer = csv.writer(fileobj) self.assertRaises(TypeError, writer.writerows, None) - writer.writerows([['a','b'],['c','d']]) + writer.writerows([['a', 'b'], ['c', 'd']]) fileobj.seek(0) self.assertEqual(fileobj.read(), "a,b\r\nc,d\r\n") + def test_writerows_with_none(self): + with TemporaryFile("w+", newline='') as fileobj: + writer = csv.writer(fileobj) + writer.writerows([['a', None], [None, 'd']]) + fileobj.seek(0) + self.assertEqual(fileobj.read(), "a,\r\n,d\r\n") + + with TemporaryFile("w+", newline='') as fileobj: + writer = csv.writer(fileobj) + writer.writerows([[None], ['a']]) + fileobj.seek(0) + self.assertEqual(fileobj.read(), '""\r\na\r\n') + + with TemporaryFile("w+", newline='') as fileobj: + writer = csv.writer(fileobj) + writer.writerows([['a'], [None]]) + fileobj.seek(0) + self.assertEqual(fileobj.read(), 'a\r\n""\r\n') + @support.cpython_only def test_writerows_legacy_strings(self): import _testcapi |