Added test cases

+llms/+utils/errorMessageCatalog.m

@@ -49,8 +49,10 @@
 catalog("llms:mustBeMessagesOrTxt") = "Messages must be text with one or more characters or an openAIMessages objects.";
 catalog("llms:invalidOptionAndValueForModel") = "'{1}' with value '{2}' is not supported for ModelName '{3}'";
 catalog("llms:invalidOptionForModel") = "{1} is not supported for ModelName '{2}'";
+catalog("llms:invalidContentTypeForModel") = "{1} is not supported for ModelName '{2}'";
 catalog("llms:functionNotAvailableForModel") = "This function is not supported for ModelName '{1}'";
 catalog("llms:promptLimitCharacter") = "Prompt must have a maximum length of {1} characters for ModelName '{2}'";
 catalog("llms:pngExpected") = "Argument must be a PNG image.";
 catalog("llms:warningJsonInstruction") = "When using JSON mode, you must also prompt the model to produce JSON yourself via a system or user message.";
+catalog("llms:apiReturnedError") = "OpenAI API Error: {1}";
 end

openAIChat.m

@@ -216,6 +216,13 @@
                 messagesStruct = messages.Messages;
             end
 
+            if iscell(messagesStruct{end}.content) && any(cellfun(@(x) isfield(x,"image_url"), messagesStruct{end}.content))
+                if ~ismember(this.ModelName,["gpt-4-turbo","gpt-4-turbo-2024-04-09"]) 
+                 error("llms:invalidContentTypeForModel", ...
+                       llms.utils.errorMessageCatalog.getMessage("llms:invalidContentTypeForModel", "Image content", this.ModelName));
+                end
+            end
+
             if ~isempty(this.SystemPrompt)
                 messagesStruct = horzcat(this.SystemPrompt, messagesStruct);
             end
@@ -227,6 +234,13 @@
                 PresencePenalty=this.PresencePenalty, FrequencyPenalty=this.FrequencyPenalty, ...
                 ResponseFormat=this.ResponseFormat,Seed=nvp.Seed, ...
                 ApiKey=this.ApiKey,TimeOut=this.TimeOut, StreamFun=this.StreamFun);
+
+            if isfield(response.Body.Data,"error")
+                err = response.Body.Data.error.message;
+                text = llms.utils.errorMessageCatalog.getMessage("llms:apiReturnedError",err);
+                message = struct("role","assistant","content",text);
+            end
+
         end
 
         function this = set.Temperature(this, temperature)

tests/topenAIChat.m

@@ -100,7 +100,21 @@ function assignValueToProperty(property, value)
             end
 
             testCase.verifyError(@()assignValueToProperty(InvalidValuesSetters.Property,InvalidValuesSetters.Value), InvalidValuesSetters.Error);
-        end      
+        end
+
+        function invalidGenerateInputforModel(testCase)
+            chat = openAIChat(ApiKey="this-is-not-a-real-key");
+            image_path = "peppers.png";
+            emptyMessages = openAIMessages;
+            inValidMessages = addUserMessageWithImages(emptyMessages,"What is in the image?",image_path);
+            testCase.verifyError(@()generate(chat,inValidMessages), "llms:invalidContentTypeForModel")
+        end
+
+        function noStopSequencesNoMaxNumTokens(testCase)
+            chat = openAIChat(ApiKey="this-is-not-a-real-key");
+            testCase.verifyWarningFree(@()generate(chat,"This is okay"));
+        end
+
     end    
 end