test: cover concurrent registry and close cleanup

backend/test/workspace-registry.test.ts

@@ -254,18 +254,21 @@ test("bootstraps a checkout and activates a validated immutable snapshot", async
   });
 });
 
-test("first list lazily bootstraps a clean registry", async () => {
+test("concurrent first lists lazily bootstrap a clean registry once safely", async () => {
   const remote = await fixture();
   const root = join(remote.root, "registry");
   const registry = new WorkspaceRegistry(config(root, remote.remote));
 
-  await expect(registry.list()).resolves.toEqual([
-    expect.objectContaining({
-      id: "psd-clinical",
-      commit: remote.initialCommit,
-      state: "operational",
-    }),
-  ]);
+  const [first, second] = await Promise.all([registry.list(), registry.list()]);
+  for (const revisions of [first, second]) {
+    expect(revisions).toEqual([
+      expect.objectContaining({
+        id: "psd-clinical",
+        commit: remote.initialCommit,
+        state: "operational",
+      }),
+    ]);
+  }
   expect(existsSync(join(root, "state", "active.json"))).toBe(true);
 });