QA: Reasoning (Default Render) — LlamaIndex

Prerequisites

• Demo is deployed and accessible
• Agent backend is healthy (check /api/health)

Test Steps

1. Basic Functionality

• Navigate to the reasoning-default-render demo page
• Verify the chat interface loads with placeholder "Type a message"
• Send a basic question such as "Explain briefly: why does ice float?"
• Verify the agent responds with a text answer

2. Built-in Reasoning Slot

• Verify the default CopilotChatReasoningMessage renders (when reasoning tokens surface) as a collapsible card
• Verify the card can be expanded/collapsed
• Confirm no custom reasoning block is used (page passes no slot override)

3. Regression

• Multiple turns preserve conversation history
• Default reasoning card re-collapses between messages