Simple Deno test fails with superoak - testing

Question

Context:
deno 1.13.2 (release, aarch64-apple-darwin) => on mac m1.
v8 9.3.345.11.
typescript 4.3.5
I'm very new with superoak and Deno tests, so I have just started with a very simple test... but this test fails.
import { Application, Router, RouterContext } from "https://deno.land/x/oak#v9.0.0/mod.ts";
import { superoak } from "https://deno.land/x/superoak#4.4.0/mod.ts";
const router = new Router();
router.get("/", (ctx: RouterContext) => {
ctx.response.body = "Hello Deno!";
});
const app = new Application();
app.use(router.routes());
app.use(router.allowedMethods());
// Send simple GET request
Deno.test("it will allow you to make assertions if you await it", async () => {
const request = await superoak(app);
await request.get("/").expect(200).expect("Hello Deno!");
});
So, as you can see, it comes from the superoak doc.
My result is similar to this issue on github, but I do an action after the get("/"). So, I don't see what I'm missing.
deno test --allow-env --allow-net ./src/app.test.ts
Check file:///Users/manu/workspace/zikstock-core/src/app.test.ts
running 1 test from file:///Users/manu/workspace/zikstock-core/src/app.test.ts
test it will allow you to make assertions if you await it ... FAILED (14ms)
failures:
it will allow you to make assertions if you await it
AssertionError: Test case is leaking async ops.
Before:
- dispatched: 2
- completed: 2
After:
- dispatched: 11
- completed: 10
Make sure to await all promises returned from Deno APIs before
finishing test case.
at assert (deno:runtime/js/06_util.js:42:13)
at asyncOpSanitizer (deno:runtime/js/40_testing.js:48:7)
at async resourceSanitizer (deno:runtime/js/40_testing.js:72:7)
at async exitSanitizer (deno:runtime/js/40_testing.js:99:9)
at async runTest (deno:runtime/js/40_testing.js:215:7)
at async Object.runTests (deno:runtime/js/40_testing.js:283:22)
at async file:///Users/manu/workspace/zikstock-core/01336b7f-6f80-4dfc-a186-d813c04240e0$deno$test.js:4:1
failures:
it will allow you to make assertions if you await it
test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out
My first surprise is that the test fails, even before having the error after the failures list.
Indeed, If I do a test which I known will fail, the result seems ok:
Deno.test("it will allow you to make assertions if you await it", async () => {
const request = await superoak(app);
const result = await request.get("/");
console.log(`Is the test ok? ${result.text === "Hello Deno!"}`);
assert(result.text === "Hello Deno!");
});
Result:
deno test --allow-env --allow-net ./src/app.test.ts
Check file:///Users/manu/workspace/zikstock-core/src/app.test.ts
running 1 test from file:///Users/manu/workspace/zikstock-core/src/app.test.ts
test it will allow you to make assertions if you await it ...Is the test ok? true
FAILED (14ms)
...
I guess it's very easy to find but need help to see it :-) Anybody can help me?