Fix doReturnErrors test

Azure no longer lets us have a GPT-3.5 deployment

Author: hjh320

tests/hopenAIChat.m

@@ -17,7 +17,6 @@
         constructor
         defaultModel
         visionModel
-        gpt35Model
     end
 
     methods (Abstract)
@@ -171,10 +170,8 @@ function assignValueToProperty(property, value)
         end
 
         function doReturnErrors(testCase)
-            % This input is considerably longer than accepted as input for
-            % GPT-3.5 (16385 tokens)
-            wayTooLong = string(repmat('a ',1,20000));
-            testCase.verifyError(@() generate(testCase.gpt35Model,wayTooLong), "llms:apiReturnedError");
+            testCase.verifyError(@() generate(testCase.defaultModel, "Hello", ResponseFormat="{bad json}"), ...
+                "llms:apiReturnedError");
         end
 
         function createChatWithStreamFunc(testCase)

tests/tazureChat.m

@@ -16,7 +16,6 @@
         defaultModel = azureChat;
         visionModel = azureChat(Deployment="gpt-4o");
         structuredModel = azureChat("Deployment","gpt-4o-2024-08-06");
-        gpt35Model = azureChat(DeploymentID="gpt-35-turbo-16k-0613");
     end
 
     methods (Test) % not calling the server

tests/topenAIChat.m

@@ -16,7 +16,6 @@
         defaultModel = openAIChat;
         visionModel = openAIChat;
         structuredModel = openAIChat;
-        gpt35Model = openAIChat(ModelName="gpt-3.5-turbo");
     end
 
     methods(Test)
@@ -83,14 +82,6 @@ function jsonFormatWithSystemPrompt(testCase)
                 generate(chat,"create some address",ResponseFormat="json"), ...
                 "string");
         end
-
-        function doReturnErrors(testCase)
-            chat = openAIChat(ModelName="gpt-3.5-turbo");
-            % This input is considerably longer than accepted as input for
-            % GPT-3.5 (16385 tokens)
-            wayTooLong = string(repmat('a ',1,20000));
-            testCase.verifyError(@() generate(chat,wayTooLong), "llms:apiReturnedError");
-        end
     end
 
     methods