1 files changed, 14 insertions, 0 deletions
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 3c2c1025d0..eef100f7ea 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -653,6 +653,20 @@ class IOTest(unittest.TestCase):
             fileio.close()
             f2.readline()
 
+    def test_nonbuffered_textio(self):
+        with warnings.catch_warnings(record=True) as recorded:
+            with self.assertRaises(ValueError):
+                self.open(support.TESTFN, 'w', buffering=0)
+            support.gc_collect()
+        self.assertEqual(recorded, [])
+
+    def test_invalid_newline(self):
+        with warnings.catch_warnings(record=True) as recorded:
+            with self.assertRaises(ValueError):
+                self.open(support.TESTFN, 'w', newline='invalid')
+            support.gc_collect()
+        self.assertEqual(recorded, [])
+
 
 class CIOTest(IOTest):