Rework handling tahoe_dip user_sync receiver in tests

Just patch with a no-op

openedx/core/djangoapps/appsembler/tahoe_idp/tests/test_tahoe_idp_account_deletion.py

@@ -8,7 +8,6 @@
 
 from django.urls import reverse
 from django.contrib.auth import get_user_model
-from django.test import override_settings
 from rest_framework.test import APITestCase
 from rest_framework import status
 
@@ -65,12 +64,12 @@ def deactivate_user(self, color, username=None):
         })
         return response
 
+    @patch('tahoe_idp.receivers.user_sync_to_idp')  # no-op
     @patch('tahoe_idp.api.get_tahoe_idp_id_by_user')
     @patch('tahoe_idp.api.deactivate_user')
     @patch.dict('django.conf.settings.FEATURES', {'ENABLE_TAHOE_IDP': True})
-    @override_settings(TAHOE_IDP_CONFIGS={'API_KEY':'fake', 'BASE_URL': 'http://localhost'})
     def test_disallow_email_reuse_after_deactivate(
-        self, mock_deactivate_user, mock_get_tahoe_idp_id_by_user
+        self, mock_deactivate_user, mock_get_tahoe_idp_id_by_user, mock_user_sync_to_idp
     ):
         """
         Test the account deletion with Tahoe IdP support.

openedx/core/djangoapps/appsembler/tahoe_idp/tests/test_tahoe_idp_reset_password.py

@@ -6,7 +6,7 @@
 
 from django.conf import settings
 from django.core import mail
-from django.test import override_settings, RequestFactory, TestCase
+from django.test import RequestFactory, TestCase
 from unittest.mock import Mock, patch
 from openedx.core.djangoapps.user_authn.views.password_reset import password_reset
 from openedx.core.djangolib.testing.utils import skip_unless_lms
@@ -16,14 +16,14 @@
 
 @ddt.ddt
 @skip_unless_lms
+@patch('tahoe_idp.receivers.user_sync_to_idp')  # no-op
 @patch('tahoe_idp.api.request_password_reset')
 class TahoeIdpResetPasswordTests(TestCase):
     """
     Tests that clicking reset works with both Tahoe IdP and non-idp logic.
     """
     request_factory = RequestFactory()
 
-    @override_settings(TAHOE_IDP_CONFIGS={'API_KEY':'fake', 'BASE_URL': 'http://localhost'})
     @ddt.unpack
     @ddt.data({
         'enable_tahoe_idp': False,
@@ -32,7 +32,7 @@ class TahoeIdpResetPasswordTests(TestCase):
         'enable_tahoe_idp': True,
         'message': 'Tahoe 2.0 logic: should NOT send email via Open edX, `tahoe_idp` takes care of that',
     })
-    def test_reset_password_with_tahoe_idp(self, mock_request_password_reset, enable_tahoe_idp, message):
+    def test_reset_password_with_tahoe_idp(self, mock_request_password_reset, mock_user_sync_to_idp, enable_tahoe_idp, message):
         """
         Tests Tahoe IdP/non-idp password reset.
         """

openedx/core/djangoapps/appsembler/tahoe_idp/tests/test_tahoe_registration_api.py

@@ -4,7 +4,6 @@
 import ddt
 from mock import patch
 
-from django.test import override_settings
 from django.urls import reverse_lazy
 from rest_framework import status
 from rest_framework.test import APITestCase
@@ -52,13 +51,13 @@ def test_api_without_tahoe_idp(self, url):
             content = response.content.decode('utf-8')
             assert response.status_code == status.HTTP_200_OK, '{} {}'.format(color1, content)
 
-    @override_settings(TAHOE_IDP_CONFIGS={'API_KEY':'fake', 'BASE_URL': 'http://localhost'})
+    @patch('tahoe_idp.receivers.user_sync_to_idp')  # no-op
     @patch.dict('django.conf.settings.FEATURES', {'ENABLE_TAHOE_IDP': True})
     @ddt.data(
         reverse_lazy('tahoe-api:v1:registrations-list'),
         reverse_lazy('tahoe-api:v2:registrations-list'),
     )
-    def test_api_wit_tahoe_idp(self, url):
+    def test_api_wit_tahoe_idp(self, mock_user_sync_to_idp, url):
         """
         Both v1 and v2 API shouldn't work with Tahoe IdP.
         """