test: isolate legacy plugin-sdk root import check

src/plugins/loader.test.ts

@@ -1,10 +1,15 @@
+import { execFileSync } from "node:child_process";
 import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
+import { pathToFileURL } from "node:url";
 import { afterAll, afterEach, describe, expect, it, vi } from "vitest";
 import { withEnv } from "../test-utils/env.js";
 async function importFreshPluginTestModules() {
   vi.resetModules();
+  vi.unmock("node:fs");
+  vi.unmock("node:fs/promises");
+  vi.unmock("node:module");
   vi.unmock("./hook-runner-global.js");
   vi.unmock("./hooks.js");
   vi.unmock("./loader.js");
@@ -1337,7 +1342,7 @@ describe("loadOpenClawPlugins", () => {
     expect(record?.status).toBe("loaded");
   });
 
-  it("supports legacy plugins importing monolithic plugin-sdk root", () => {
+  it("supports legacy plugins importing monolithic plugin-sdk root", async () => {
     useNoBundledPlugins();
     const plugin = writePlugin({
       id: "legacy-root-import",
@@ -1349,15 +1354,37 @@ describe("loadOpenClawPlugins", () => {
 };`,
     });
 
-    const registry = loadRegistryFromSinglePlugin({
-      plugin,
-      pluginConfig: {
-        allow: ["legacy-root-import"],
-      },
-    });
+    const loaderModuleUrl = pathToFileURL(
+      path.join(process.cwd(), "src", "plugins", "loader.ts"),
+    ).href;
+    const script = `
+      import { loadOpenClawPlugins } from ${JSON.stringify(loaderModuleUrl)};
+      const registry = loadOpenClawPlugins({
+        cache: false,
+        workspaceDir: ${JSON.stringify(plugin.dir)},
+        config: {
+          plugins: {
+            load: { paths: [${JSON.stringify(plugin.file)}] },
+            allow: ["legacy-root-import"],
+          },
+        },
+      });
+      const record = registry.plugins.find((entry) => entry.id === "legacy-root-import");
+      if (!record || record.status !== "loaded") {
+        console.error(record?.error ?? "legacy-root-import missing");
+        process.exit(1);
+      }
+    `;
 
-    const record = registry.plugins.find((entry) => entry.id === "legacy-root-import");
-    expect({ status: record?.status, error: record?.error }).toMatchObject({ status: "loaded" });
+    execFileSync(process.execPath, ["--import", "tsx", "--input-type=module", "-e", script], {
+      cwd: process.cwd(),
+      env: {
+        ...process.env,
+        OPENCLAW_BUNDLED_PLUGINS_DIR: "/nonexistent/bundled/plugins",
+      },
+      encoding: "utf-8",
+      stdio: "pipe",
+    });
   });
 
   it("prefers dist plugin-sdk alias when loader runs from dist", () => {