1 files changed, 18 insertions, 0 deletions
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 57b22c6..64c66d88 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -1072,6 +1072,12 @@ class CBufferedReaderTest(BufferedReaderTest, SizeofTest):
         support.gc_collect()
         self.assertTrue(wr() is None, wr)
 
+    def test_args_error(self):
+        # Issue #17275
+        with self.assertRaisesRegex(TypeError, "BufferedReader"):
+            self.tp(io.BytesIO(), 1024, 1024, 1024)
+
+
 class PyBufferedReaderTest(BufferedReaderTest):
     tp = pyio.BufferedReader
 
@@ -1363,6 +1369,11 @@ class CBufferedWriterTest(BufferedWriterTest, SizeofTest):
         with self.open(support.TESTFN, "rb") as f:
             self.assertEqual(f.read(), b"123xxx")
 
+    def test_args_error(self):
+        # Issue #17275
+        with self.assertRaisesRegex(TypeError, "BufferedWriter"):
+            self.tp(io.BytesIO(), 1024, 1024, 1024)
+
 
 class PyBufferedWriterTest(BufferedWriterTest):
     tp = pyio.BufferedWriter
@@ -1715,6 +1726,7 @@ class BufferedRandomTest(BufferedReaderTest, BufferedWriterTest):
     # You can't construct a BufferedRandom over a non-seekable stream.
     test_unseekable = None
 
+
 class CBufferedRandomTest(BufferedRandomTest, SizeofTest):
     tp = io.BufferedRandom
 
@@ -1732,6 +1744,12 @@ class CBufferedRandomTest(BufferedRandomTest, SizeofTest):
         CBufferedReaderTest.test_garbage_collection(self)
         CBufferedWriterTest.test_garbage_collection(self)
 
+    def test_args_error(self):
+        # Issue #17275
+        with self.assertRaisesRegex(TypeError, "BufferedRandom"):
+            self.tp(io.BytesIO(), 1024, 1024, 1024)
+
+
 class PyBufferedRandomTest(BufferedRandomTest):
     tp = pyio.BufferedRandom