How to use the rxjs-marbles/ava.marbles function in rxjs-marbles

import test from "ava";
import { marbles } from "rxjs-marbles/ava";
import { map } from "rxjs/operators";

test(
  "should support marble tests without values",
  marbles((m, t) => {
    t.plan(2);

    const source = m.hot("  --^-a-b-c-|");
    const subs = "            ^-------!";
    const expected = m.cold(" --b-c-d-|");

    const destination = source.pipe(
      map(value => String.fromCharCode(value.charCodeAt(0) + 1))
    );
    m.expect(destination).toBeObservable(expected);
    m.expect(source).toHaveSubscriptions(subs);
  })
);

test(
  "should support marble tests with values",