Jest not awaiting timeout before test completes - async-await

Question

I have a test that awaits an async function, then awaits a timeout, then awaits another async function.
it('runs a snipe successfully', async () => {
const exitCode = await john.chat.sendMoneyInChat(channel.topicName, channel.name, "0.01", botUsername);
console.log('timeout?')
await timeout(3000);
console.log('timeout!');
console.log('running bal check')
let values;
const nbl = await croupier.checkWalletBalance(process.env.CROUPIER_RINGO_USERNAME);
expect(nbl).toEqual(123);
})
Based on my console.log output, the afterAll teardown process begins right after the timeout? log statement. In other words, I don't see "timeout!" in the console log – I see the console.log statements within the afterAll teardown.
What gives?
EDIT:
Thanks to #Metalmi's help, I've fixed one bug. Now my code is:
it('runs a snipe successfully', async () => {
jest.useFakeTimers()
const exitCode = await john.chat.sendMoneyInChat(channel.topicName, channel.name, "0.01", botUsername);
console.log('timeout?')
jest.advanceTimersByTime(20000)
console.log('timeout.');
console.log('running bal check')
let values;
const nbl = await croupier.checkWalletBalance(process.env.CROUPIER_RINGO_USERNAME);
expect(nbl).toEqual(123);
});
Here's the checkWalletBalance function:
public checkWalletBalance(username: string): Promise<any> {
let balance: number = 0;
const self = this;
return new Promise(async (resolve) => {
try {
const acct = await self.bot1.wallet.lookup(username);
console.log("acct", acct);
const balances = await self.bot2.wallet.balances(acct.accountId);
console.log("balances", balances);
balances.forEach((acctDetail) => {
console.log(acctDetail.balance[0].amount);
balance += parseFloat(acctDetail.balance[0].amount);
});
resolve(balance);
} catch (e) {
console.log(e);
throw e;
}
});
}
I am guessing there is some problem of having async functions inside the Promise?
The Jest teardown starts before console.log("acct", acct) happens within checkWalletBalance, so something's still wrong.

Answer 1

To use/test standard timer functions, you need to instruct jest to use fake timers: jest.useFakeTimers(). Then you need to manually advance time: jest.advanceTimersByTime(msToRun)
EDIT:
Issue is that you declared Promise as async, and not the checkWalletBalance() itself. Changing that should fix it.
Also, to be sure about assertion being checked, you can call expect.assertions(1) at the beginning of test, so jest knows that test must have at least one assertion and won't finish before it's checked.