重建会话记录逻辑

tests/routes/chatSession.test.ts

@@ -2,6 +2,7 @@ import { describe, expect, it } from "bun:test";
 
 import {
   buildPromptWithLearningContext,
+  extractLatestFrontendTurn,
   generateSessionTitle,
   shouldGenerateSessionTitle,
 } from "../../src/routes/chatSession.js";
@@ -161,3 +162,24 @@ describe("buildPromptWithLearningContext", () => {
     expect(prompt).toBe("基于刚才结果继续分析");
   });
 });
+
+describe("extractLatestFrontendTurn", () => {
+  it("extracts the latest valid frontend user and assistant turn", () => {
+    const turn = extractLatestFrontendTurn([
+      { role: "user", content: "检查 DMA-2 漏损" },
+      {
+        role: "assistant",
+        content: "DMA-2 夜间最小流量持续抬升。",
+        progress: [{ id: "tool-dma", phase: "tool" }],
+      },
+      { role: "user", content: "继续分析相邻分区" },
+      { role: "assistant", content: "⚠️ **请求已中断**", isError: true },
+    ]);
+
+    expect(turn).toEqual({
+      assistantMessage: "DMA-2 夜间最小流量持续抬升。",
+      toolCallCount: 1,
+      userMessage: "检查 DMA-2 漏损",
+    });
+  });
+});