test: add E2E tests for session-level system prompt override

Co-authored-by: CodeFree <codefree@chinatelcom.cn>

e2e/global-setup.ts

@@ -57,7 +57,9 @@ function startMockLlm(): Promise<void> {
             ? parsed.messages.find((m: any) => m.role === "system")
             : undefined;
           if (systemMsg?.content) {
-            (globalThis as any).__lastMockSystemPrompt = systemMsg.content;
+            try {
+              writeFileSync("/tmp/e2e-last-system-prompt.txt", String(systemMsg.content));
+            } catch {}
           }
           const chars = Array.from(MOCK_REPLY);
           res.writeHead(200, {

e2e/specs/agent-chat.spec.ts

@@ -1,8 +1,17 @@
 import { test, expect } from "@playwright/test";
+import { readFileSync } from "node:fs";
 import { E2E_ADMIN, FIXED_CAPTCHA } from "../fixtures/test-users";
 
 const MOCK_REPLY = "你好！这是一个测试回复。";
 
+function getLastSystemPrompt(): string {
+  try {
+    return readFileSync("/tmp/e2e-last-system-prompt.txt", "utf-8");
+  } catch {
+    return "";
+  }
+}
+
 async function loginViaUI(page: import("@playwright/test").Page) {
   await page.goto("/auth/login");
   await page.fill("#login-username", E2E_ADMIN.username);
@@ -127,4 +136,76 @@ test.describe("Agent 对话", () => {
     await expect(page.locator(".agent-message.is-user")).toHaveCount(2, { timeout: 10000 });
     await expect(page.locator(".agent-message.is-assistant")).toHaveCount(2, { timeout: 30000 });
   });
+
+  test("修改系统提示词后发送消息使用自定义提示词", async ({ page }) => {
+    await loginViaUI(page);
+
+    const createBody = await page.evaluate(async () => {
+      const res = await fetch("/api/agents/default/sessions", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ systemPrompt: "You are a pirate. Always respond in pirate speak." }),
+      });
+      return res.json();
+    });
+    const sessionId = createBody.data.id;
+
+    await page.goto(`/chat/default?session=${sessionId}`);
+    await page.waitForTimeout(1000);
+    const newChatBtn = page.locator(".new-chat-btn").first();
+    if (await newChatBtn.isVisible()) {
+      await newChatBtn.click();
+      await page.waitForTimeout(500);
+    }
+
+    await page.fill(".agent-textarea", "hello");
+    await page.click(".btn-send");
+
+    await expect(
+      page.locator(".agent-message.is-assistant .agent-markdown").first(),
+    ).toContainText(MOCK_REPLY, { timeout: 30000 });
+
+    const lastPrompt = getLastSystemPrompt();
+    expect(lastPrompt).toBe("You are a pirate. Always respond in pirate speak.");
+  });
+
+  test("重置系统提示词后回退到 Agent 默认", async ({ page }) => {
+    await loginViaUI(page);
+
+    const createBody = await page.evaluate(async () => {
+      const res = await fetch("/api/agents/default/sessions", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ systemPrompt: "temporary custom prompt" }),
+      });
+      return res.json();
+    });
+    const sessionId = createBody.data.id;
+
+    await page.evaluate(async (id) => {
+      await fetch(`/api/agents/default/sessions/${id}/config`, {
+        method: "PUT",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ systemPrompt: null }),
+      });
+    }, sessionId);
+
+    await page.goto(`/chat/default?session=${sessionId}`);
+    await page.waitForTimeout(1000);
+    const newChatBtn = page.locator(".new-chat-btn").first();
+    if (await newChatBtn.isVisible()) {
+      await newChatBtn.click();
+      await page.waitForTimeout(500);
+    }
+
+    await page.fill(".agent-textarea", "hello again");
+    await page.click(".btn-send");
+
+    await expect(
+      page.locator(".agent-message.is-assistant .agent-markdown").first(),
+    ).toContainText(MOCK_REPLY, { timeout: 30000 });
+
+    const lastPrompt = getLastSystemPrompt();
+    expect(lastPrompt).toBe("You are a helpful AI assistant.");
+  });
 });