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

it(
    "should support marble tests with errors",
    marbles(m => {
      const source = m.hot("  --^-a-b-c-#");
      const subs = "            ^-------!";
      const expected = m.cold(" --a-b-c-#");

      const destination = source;
      m.expect(destination).toBeObservable(expected);
      m.expect(source).toHaveSubscriptions(subs);
    })
  );

  it(
    "should support marble tests with explicit errors",
    marbles(m => {
      const inputs = {
        a: 1,
        b: 2,
        c: 3
      };
      const outputs = {
        x: 2,
        y: 3,
        z: 4
      };

      const source = m.hot("  --^-a-b-c-#", inputs, new Error("Boom!"));
      const subs = "            ^-------!";
      const expected = m.cold(" --x-y-z-#", outputs, new Error("Boom!"));

      const destination = source.pipe(map(value => value + 1));