feat!: MVR release preparation (#766)

* feat!: MVR release preparation

* fix: added test for json data in http client

CHANGES.md

@@ -3,44 +3,6 @@ twilio-python Changelog
 
 Here you can see the full list of changes between each twilio-python release.
 
-[2024-02-09] Version 9.0.0-rc.2
--------------------------------
-**Library - Chore**
-- [PR #765](https://github.com/twilio/twilio-python/pull/765): disables cluster test. Thanks to [@tiwarishubham635](https://github.com/tiwarishubham635)!
-
-**Flex**
-- Adding `flex_instance_sid` to Flex Configuration
-
-**Insights**
-- add flag to restrict access to unapid customers
-
-**Lookups**
-- Remove `carrier` field from `sms_pumping_risk` and leave `carrier_risk_category` **(breaking change)**
-- Remove carrier information from call forwarding package **(breaking change)**
-
-**Messaging**
-- Add update instance endpoints to us_app_to_person api
-
-**Push**
-- Migrated to new Push API V4 with Resilient Notification Delivery.
-
-**Trusthub**
-- Add optional field NotificationEmail to the POST /v1/ComplianceInquiries/Customers/Initialize API
-
-**Verify**
-- `Tags` property added again to Public Docs **(breaking change)**
-
-
-[2024-01-08] Version 9.0.0-rc.1
--------------------------------
-**Library - Chore**
-- [PR #743](https://github.com/twilio/twilio-python/pull/743): sync with main. Thanks to [@tiwarishubham635](https://github.com/tiwarishubham635)!
-
-
-[2023-12-06] Version 9.0.0-rc.0
----------------------------
-- Release Candidate preparation
-
 [2023-12-14] Version 8.11.0
 ---------------------------
 **Library - Chore**

UPGRADE.md

@@ -3,14 +3,13 @@
 _`MAJOR` version bumps will have upgrade notes
 posted here._
 
-## [2023-12-06] 8.x.x to 9.x.x-rc.x
-
----
+## [2024-02-20] 8.x.x to 9.x.x
 ### Overview
 
-#### Twilio Python Helper Library’s major version 9.0.0-rc.x is now available. We ensured that you can upgrade to Python helper Library 9.0.0-rc.x version without any breaking changes
+##### Twilio Python Helper Library’s major version 9.0.0 is now available. We ensured that you can upgrade to Python helper Library 9.0.0 version without any breaking changes of existing apis
 
-Support for JSON payloads has been added in the request body
+Behind the scenes Python Helper is now auto-generated via OpenAPI with this release. This enables us to rapidly add new features and enhance consistency across versions and languages.
+We're pleased to inform you that version 9.0.0 adds support for the application/json content type in the request body.
 
 
 ## [2023-04-05] 7.x.x to 8.x.x

tests/unit/http/test_http_client.py

@@ -145,6 +145,32 @@ def test_last_request_last_response_exist(self):
                 "testing-unicode: Ω≈ç√, 💩", self.client._test_only_last_response.text
             )
 
+    def test_request_with_json(self):
+        self.request_mock.url = "https://api.twilio.com/"
+        self.request_mock.headers = {"Host": "other.twilio.com"}
+
+        self.client.request(
+            "doesnt-matter-method",
+            "doesnt-matter-url",
+            {"params-value": "params-key"},
+            {"json-key": "json-value"},
+            {"Content-Type": "application/json"},
+        )
+
+        self.assertIsNotNone(self.client._test_only_last_request)
+        self.assertEqual(
+            {"Content-Type": "application/json"},
+            self.client._test_only_last_request.headers,
+        )
+
+        self.assertIsNotNone(self.client._test_only_last_response)
+
+        if self.client._test_only_last_response is not None:
+            self.assertEqual(200, self.client._test_only_last_response.status_code)
+            self.assertEqual(
+                "testing-unicode: Ω≈ç√, 💩", self.client._test_only_last_response.text
+            )
+
     def test_last_response_empty_on_error(self):
         self.session_mock.send.side_effect = Exception("voltron")