main.spec.ts

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

describe("rxjs-marbles", () => {
  it(
    "should support marble tests",
    marbles(m => {
      const source = m.hot("--^-a-b-c-|");
      const subs = "^-------!";
      const expected = "--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);
    })
  );
});