Trying to TDD with jest

[jimmythecode]

Is your feature request related to a problem? Please describe.
I'm trying to test as I develop with jest.

Describe the solution you'd like
A working example would be really helpful

Describe alternatives you've considered
I've tried to figure it out myself. I got as far as the following code, but I get the Jest has detected the following 1 open handle potentially keeping Jest from exiting: error:

import { SubmissionStream } from "snoostorm";
import { redditApiClientInfo } from "./redditApi";

let submissionStream: SubmissionStream;
beforeAll(() => {
    submissionStream = new SubmissionStream(redditApiClientInfo, {
        subreddit: "malefashionadvice",
        pollTime: 1000, // runs every 1 seconds
        limit: 2,
    });
});

afterAll(async () => {
   return submissionStream.end()
});

export async function getLatestWaywtPost(submissionStream: SubmissionStream) {
    let submissionsCount = 0;
    submissionStream.on("item", async submission => {
        console.log(submission);
        submissionsCount ++;
    })
    if(submissionsCount === 2){
        console.log("ending stream, count:", submissionsCount);
        return submissionsCount;
    }
}

test("getLatestWaywtPost()", async () => {
    const latestPostLength = await getLatestWaywtPost(submissionStream)
    await new Promise((r) => setTimeout(r, 2000));
    expect(latestPostLength).toBe(2)
});

Additional context
N/A

[brenapp]

Related to #59, currently there is no way for you to handle exceptions encountered, but it wouldn't be too difficult to add. I will add it to my todo list :-)