[tests] Clean up handle

Author: jamesgpearce

test/unit/persisters/persisters.test.ts

@@ -324,10 +324,11 @@ describe.each([
   test('does not autoLoad from non-existent', async () => {
     if (persistable.testMissing) {
       store.setTables({t1: {r1: {c1: 1}}});
-      await persistable
+      const persister = await persistable
         .getPersister(store, join(tmp.dirSync().name, '_'))
         .startAutoLoad();
       expect(store.getTables()).toEqual({t1: {r1: {c1: 1}}});
+      persister.destroy();
     }
   });