PYTHON-5421 continued - update changelog, update docstring, and add testing

doc/changelog.rst

@@ -13,6 +13,7 @@ PyMongo 4.14 brings a number of changes including:
 
 - Introduces a minor breaking change. When encoding :class:`bson.binary.BinaryVector`, a ``ValueError`` will be raised
   if the 'padding' metadata field is < 0 or > 7, or non-zero for any type other than PACKED_BIT.
+- Changed :meth:`~pymongo.uri_parser.parse_uri`'s 'options' to be type ``dict`` instead of ``_CaseInsensitiveDictionary``.
 
 Changes in Version 4.13.2 (2025/06/17)
 --------------------------------------

pymongo/asynchronous/uri_parser.py

@@ -80,6 +80,9 @@ async def parse_uri(
           wait for a response from the DNS server.
     :param srv_service_name: A custom SRV service name
 
+    .. versionchanged:: 4.14
+       'options' is now type ``dict`` as opposed to a ``_CaseInsensitiveDictionary``.
+
     .. versionchanged:: 4.6
        The delimiting slash (``/``) between hosts and connection options is now optional.
        For example, "mongodb://example.com?tls=true" is now a valid URI.

pymongo/synchronous/uri_parser.py

@@ -80,6 +80,9 @@ def parse_uri(
           wait for a response from the DNS server.
     :param srv_service_name: A custom SRV service name
 
+    .. versionchanged:: 4.14
+       'options' is now type ``dict`` as opposed to a ``_CaseInsensitiveDictionary``.
+
     .. versionchanged:: 4.6
        The delimiting slash (``/``) between hosts and connection options is now optional.
        For example, "mongodb://example.com?tls=true" is now a valid URI.

test/test_uri_parser.py

@@ -555,6 +555,10 @@ def test_port_with_whitespace(self):
         with self.assertRaisesRegex(ValueError, r"Port contains whitespace character: '\\n'"):
             parse_uri("mongodb://localhost:27\n017")
 
+    def test_parse_uri_options_type(self):
+        opts = parse_uri("mongodb://localhost:27017")["options"]
+        self.assertIsInstance(opts, dict)
+
 
 if __name__ == "__main__":
     unittest.main()