test: verify /acp works in pi-web (SDK embedded host)

tests/pi-web-acp.test.ts

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+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { mkdtempSync, mkdirSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+
+// tsup defines CURRENT_VERSION at build time; under the node test runner it
+// is bare, so stub it before the module graph reads it.
+(globalThis as Record<string, unknown>).CURRENT_VERSION ??= "0.0.0-test";
+
+const { createAgentSession, DefaultResourceLoader, SessionManager } = await import(
+  "@earendil-works/pi-coding-agent"
+);
+const { createAcpExtension } = await import("../src/index.js");
+
+type Notify = { msg: string; type?: string };
+
+interface PiWebSession {
+  session: Awaited<ReturnType<typeof createAgentSession>>["session"];
+  notifications: Notify[];
+  cleanup: () => Promise<void>;
+}
+
+// Simulate a pi-web host: embeds the pi SDK in another node process, drives the
+// agent via AgentSession.prompt(), and surfaces extension output through a UI
+// context whose notify() reaches the web chat. Mirrors that contract so /acp is
+// verified end-to-end without the real pi-web app installed.
+async function createPiWebSession(): Promise<PiWebSession> {
+  const base = mkdtempSync(join(tmpdir(), "piweb-test-"));
+  const agentDir = join(base, "agent");
+  const cwd = join(base, "cwd");
+  const sessionDir = join(base, "sessions");
+  for (const d of [agentDir, cwd, sessionDir]) mkdirSync(d, { recursive: true });
+
+  const factory = createAcpExtension({ autoUpdate: false });
+  const resourceLoader = new DefaultResourceLoader({
+    cwd,
+    agentDir,
+    extensionFactories: [factory],
+  });
+  // createAgentSession does NOT reload a caller-supplied loader; do it here.
+  await resourceLoader.reload();
+
+  const sessionManager = SessionManager.create(cwd, sessionDir);
+  const { session } = await createAgentSession({
+    cwd,
+    agentDir,
+    resourceLoader,
+    sessionManager,
+  });
+
+  const notifications: Notify[] = [];
+  const uiContext = new Proxy(
+    {},
+    {
+      has: () => true,
+      get(_t, prop) {
+        if (prop === "notify")
+          return (msg: string, type?: string) => notifications.push({ msg, type });
+        if (prop === "select") return async () => undefined;
+        if (prop === "confirm") return async () => false;
+        if (prop === "input") return async () => undefined;
+        if (prop === "custom") return async () => undefined;
+        return () => {};
+      },
+    },
+  );
+  await session.bindExtensions({ uiContext, mode: "rpc" });
+
+  return {
+    session,
+    notifications,
+    cleanup: async () => {
+      await session.dispose?.();
+      rmSync(base, { recursive: true, force: true });
+    },
+  };
+}
+
+test("pi-web: /acp renders the ACP status panel via ui.notify", async () => {
+  const { session, notifications, cleanup } = await createPiWebSession();
+  try {
+    await session.prompt("/acp");
+    assert.equal(notifications.length, 1);
+    assert.match(notifications[0].msg, /ACP Context Analysis/);
+    assert.match(notifications[0].msg, /billion-context-pi@/);
+    assert.match(notifications[0].msg, /Sent to LLM/);
+    assert.match(notifications[0].msg, /Nudge:/);
+    assert.match(notifications[0].msg, /Blocks:/);
+  } finally {
+    await cleanup();
+  }
+});
+
+test("pi-web: /acp-status, /acp-search, /acp-subagents all notify", async () => {
+  const { session, notifications, cleanup } = await createPiWebSession();
+  try {
+    await session.prompt("/acp-status");
+    assert.equal(notifications.length, 1);
+    assert.match(notifications[0].msg, /ACP Context Analysis/);
+
+    notifications.length = 0;
+    await session.prompt("/acp-search context");
+    assert.ok(notifications.length >= 1, "acp-search should notify a result");
+
+    notifications.length = 0;
+    await session.prompt("/acp-subagents");
+    assert.ok(notifications.length >= 1, "acp-subagents should notify a result");
+  } finally {
+    await cleanup();
+  }
+});