How to write test jest of async/await is toHaveBeenCalled? - node.js

Question

`Trying to run a test for the following code using Jest.I mocked the function and checked if it runs with the desired intent. I think the error is in the promise but I can't find a solution. Can you help me?
Why redis.set not call
i get error
expect(jest.fn()).toHaveBeenCalled()
Expected number of calls: >= 1
Received number of calls: 0
mailparser.js
mail parser will call with mgs(‘body’,(stream)=>{parser})
const parser = async (stream) => {
try {
const mail = await simpleParser(stream)
const isAvailable = await redis.set(
[`mail_message_id_${mail.messageId}`],
[`${mail.messageId}`],
{
flag: 'NX',
expiry: 60 * 30,
}
)
if (!isAvailable) {
return console.log(`${mail.messageId} is already processed.`)
}
} catch (err) {
console.error(err, 'failed to parser mail')
}
}
Here my unit Ttesting
const stream = 'stream'
const mockParser = {
simpleParser: jest.fn(),
}
const mockRedis = {
set: jest.fn(),
}
beforeAll(() => {
jest.mock('./redis', () => {
return {
set: mockRedis.set,
}
})
jest.mock('mailparser', () => {
return {
simpleParser: mockParser.simpleParser,
}
})
jest.fn().mockImplementation(() => mockMgs)
})
beforeEach(() => {
mockMgs.on.mockImplementationOnce((event, fn) => {
fn(stream)
})
})
afterEach(async () => {
await jest.clearAllMocks()
})
describe('mailparser', () => {
test('should call redis.set with params correctly', async () => {
const mailparser = require('./mailparser')
await mockParser.simpleParser.mockImplementation(() =>
Promise.resolve(mail) //mail is object data
)
mockRedis.set.mockImplementationOnce(() => Promise.resolve('OK'))
mailparser(mockMgs, 1)
expect(mockRedis.set).toHaveBeenCalled()
})