diff options
Diffstat (limited to 'Lib/test')
| -rw-r--r-- | Lib/test/test_csv.py | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Lib/test/test_csv.py b/Lib/test/test_csv.py index 976e620..479ebd9 100644 --- a/Lib/test/test_csv.py +++ b/Lib/test/test_csv.py @@ -570,6 +570,18 @@ class TestDictFields(unittest.TestCase): fileobj = StringIO() self.assertRaises(TypeError, csv.DictWriter, fileobj) + def test_write_fields_not_in_fieldnames(self): + with TemporaryFile("w+", newline='') as fileobj: + writer = csv.DictWriter(fileobj, fieldnames = ["f1", "f2", "f3"]) + # Of special note is the non-string key (issue 19449) + with self.assertRaises(ValueError) as cx: + writer.writerow({"f4": 10, "f2": "spam", 1: "abc"}) + exception = str(cx.exception) + self.assertIn("fieldnames", exception) + self.assertIn("'f4'", exception) + self.assertNotIn("'f2'", exception) + self.assertIn("1", exception) + def test_read_dict_fields(self): with TemporaryFile("w+") as fileobj: fileobj.write("1,2,abc\r\n") |