Use a mock when making external calls in tests.

spiffworkflow-backend/tests/spiffworkflow_backend/unit/test_service_task_delegate.py

@@ -1,8 +1,8 @@
 """Test_various_bpmn_constructs."""
 import pytest
 from flask.app import Flask
+from unittest.mock import Mock, patch
 from tests.spiffworkflow_backend.helpers.base_test import BaseTest
-
 from spiffworkflow_backend.services.secret_service import SecretService
 from spiffworkflow_backend.services.service_task_service import ConnectorProxyError
 from spiffworkflow_backend.services.service_task_service import ServiceTaskDelegate
@@ -37,8 +37,12 @@ class TestServiceTaskDelegate(BaseTest):
     def test_invalid_call_returns_good_error_message(
         self, app: Flask, with_db_and_bpmn_file_cleanup: None
     ) -> None:
-        with pytest.raises(ConnectorProxyError) as ae:
-            ServiceTaskDelegate.call_connector("my_invalid_operation", {}, {})
+        with patch('requests.post') as mock_post:
+            mock_post.return_value.status_code = 404
+            mock_post.return_value.ok = True
+            mock_post.return_value.json.return_value = ""
+            with pytest.raises(ConnectorProxyError) as ae:
+                ServiceTaskDelegate.call_connector("my_invalid_operation", {}, {})
         assert "404" in str(ae)
         assert "The service did not find the requested resource." in str(ae)
         assert (