Sometimes we want to test async stuff:
it("does something async", async () => {
await something();
expect(thing).toBe("foo");
});
For this to work, notice that the second argument to the it function call is now marked as async. This is a hint to how the test runner must change: it must assume that the test body returns a Promise object, which is what the async method means.
But with our current test runner, our tests will complete, reporting no failures for any test that awaits a Promise, because our test runner won’t ...
