improved deferred reject assertion

src/helpers/deferred.test.ts

@@ -10,6 +10,5 @@ test("reject", async () => {
   const deferred = createDeferred()
   const error = new Error("oops")
   setTimeout(() => deferred.reject(error))
-  const caught = await Promise.resolve(deferred).catch((error) => error)
+  await expect(deferred).rejects.toThrow(error)
-  expect(caught).toBe(error)
 })