unit test fix

lib/instrumentation/@google/genai.js

@@ -167,8 +167,7 @@ function instrumentStream ({ agent, shim, request, response, segment, transactio
             candidates: [
               { content, finishReason }
             ],
-            modelVersion,
-            text: entireMessage
+            modelVersion
           }
           recordChatCompletionMessages({
             agent: shim.agent,

lib/llm-events/google-genai/chat-completion-message.js

@@ -23,7 +23,8 @@ module.exports = class LlmChatCompletionMessage extends LlmEvent {
     this.role = message?.role ?? 'user' // Role is only defined if it is 'model'
     this.sequence = index
     this.completion_id = completionId
-    this.is_response = response?.text === message?.parts?.[0]?.text
+    const responseText = response?.text ?? response?.candidates?.[0]?.content?.parts?.[0]?.text
+    this.is_response = responseText === message?.parts?.[0]?.text
 
     if (agent.config.ai_monitoring.record_content.enabled === true) {
       this.content = this.is_response ? message?.parts?.[0]?.text : message