diff --git a/test/shared/mutex.test.ts b/test/shared/mutex.test.ts
index 933122c..aeaf8d2 100644
--- a/test/shared/mutex.test.ts
+++ b/test/shared/mutex.test.ts
@@ -57,6 +57,10 @@ describe('Mutex', () => {
     const guard = m.tryLock();
     assert.ok(guard);
     assert.equal(typeof guard[Symbol.dispose], 'function');
+    guard[Symbol.dispose]();
+    // Should be able to lock again after dispose
+    const guard2 = m.tryLock();
+    assert.ok(guard2);
     m.unlock();
   });