Shouldn’t await and then behave the same way?

Until today, I thought that await and then were 2 different ways to handle promises results.

I used nodemailer.createTestAccount to do some e2e testing and I stumbled in this counter-intuitive behaviour.

This is what the below code does:

• I have 2 test functions: testA and testB (they should do the same exact thing)
• I call the 2 functions and I get some output
• testA seems to work properly returning different value every call
• testB seems to return always the same value

const nodemailer = require("nodemailer");

const testA = async () => {
  nodemailer.createTestAccount().then(account => { console.log("testA:", account.user) })
  nodemailer.createTestAccount().then(account => { console.log("testA:", account.user) })
  nodemailer.createTestAccount().then(account => { console.log("testA:", account.user) })
}

const testB = async () => {
  const test1 = await nodemailer.createTestAccount()
  console.log("testB:", test1.user)

  const test2 = await nodemailer.createTestAccount()
  console.log("testB:", test2.user)

  const test3 = await nodemailer.createTestAccount()
  console.log("testB:", test3.user)
}

testA()
testB()

The result (hand sorted for readability):

testA: [email protected]
testA: [email protected]
testA: [email protected]

testB: [email protected]
testB: [email protected]
testB: [email protected]

Can someone explain me why is this happening?