#19307: Improve error message for json.load(s) while passing objects of the wrong type.

1 files changed, 8 insertions, 1 deletions

diff --git a/Lib/test/test_json/test_decode.py b/Lib/test/test_json/test_decode.py
index d23e285909..05d07b7219 100644
--- a/Lib/test/test_json/test_decode.py
+++ b/Lib/test/test_json/test_decode.py
@@ -1,5 +1,5 @@
 import decimal
-from io import StringIO
+from io import StringIO, BytesIO
 from collections import OrderedDict
 from test.test_json import PyTest, CTest
 
@@ -70,5 +70,12 @@ class TestDecode:
         msg = 'escape'
         self.assertRaisesRegex(ValueError, msg, self.loads, s)
 
+    def test_invalid_input_type(self):
+        msg = 'the JSON object must be str'
+        for value in [1, 3.14, b'bytes', b'\xff\x00', [], {}, None]:
+            self.assertRaisesRegex(TypeError, msg, self.loads, value)
+        with self.assertRaisesRegex(TypeError, msg):
+            self.json.load(BytesIO(b'[1,2,3]'))
+
 class TestPyDecode(TestDecode, PyTest): pass
 class TestCDecode(TestDecode, CTest): pass