tests: Add tests for numeric response data in stat() method

Author: Mr-Sunglasses

Lib/test/test_poplib.py

@@ -289,6 +289,27 @@ def test_pass_(self):
     def test_stat(self):
         self.assertEqual(self.client.stat(), (10, 100))
 
+        original_shortcmd = self.client._shortcmd
+        def mock_shortcmd_invalid_format(cmd):
+            if cmd == 'STAT':
+                return b'+OK'
+            return original_shortcmd(cmd)
+
+        self.client._shortcmd = mock_shortcmd_invalid_format
+        with self.assertRaises(poplib.error_proto):
+            self.client.stat()
+
+        def mock_shortcmd_invalid_data(cmd):
+            if cmd == 'STAT':
+                return b'+OK abc def'
+            return original_shortcmd(cmd)
+
+        self.client._shortcmd = mock_shortcmd_invalid_data
+        with self.assertRaises(poplib.error_proto):
+            self.client.stat()
+
+        self.client._shortcmd = original_shortcmd
+
     def test_list(self):
         self.assertEqual(self.client.list()[1:],
                          ([b'1 1', b'2 2', b'3 3', b'4 4', b'5 5'],