ERC20 transfer not updating account values

I’m doing the DAPP university create a token tutorial as a way to learn solidity,etc.
Things look good – except that the transfer function doesn’t see to actually do anything.
When the contract deploys account[0] has 5001 tokens in it.

When i run a simply test of the transfer function moving 1000 from account[0] to account[1] the function returns successful.

But the assert fail because the amount isn’t actually change in either account[0] or accounts[1].
I did use truffle debug – and when I step through it it does work fine and I can see the account values change.

When I run my test Js file though – it looks like the values refuse to change. Also when I do it by hand in the console as shown below. I’m a bit baffled. perhaps I’m not defining the hash correctly?

Code:

mapping(address => uint256) public balanceOf;    
    ...       
           function transfer(address receiver, uint256 numTokens) public returns (bool) {
                require(numTokens <= balanceOf[msg.sender]);
                balanceOf[msg.sender] = balanceOf[msg.sender] - numTokens;
                balanceOf[receiver]   = balanceOf[receiver]   + numTokens;
                emit Transfer(msg.sender, receiver, numTokens);
                return true;
            }

javascript test

Contract: xfer
    1) The Big Bang (aka Constuct)
    > No events were emitted

  0 passing (487ms)
  1 failing

  1) Contract: xfer
       The Big Bang (aka Constuct):

      AssertionError: expected 5001 to equal 4001
      + expected - actual

      -5001
      +4001

truffle console test:

 PS D:\morte\token> truffle console
    truffle(development)> let token = await Token.deployed();
    undefined
    truffle(development)> token.totalSupply().then(function(s) {total = s;});
    undefined
    truffle(development)> total.toNumber();
    5001
    truffle(development)> token.balanceOf(accounts[0]).then(function(t) {acct0bal = t;});
    undefined
    truffle(development)> acct0bal.toNumber();
    5001
    truffle(development)> token.balanceOf(accounts[1]).then(function(t) {acct1bal = t;});
    undefined
    truffle(development)> acct1bal.toNumber();
    0
    truffle(development)> token.transfer.call(accounts[1],1000,{from: accounts[0]}).then(function(suc){success=suc});
    undefined
    truffle(development)> success
    true
    truffle(development)> token.balanceOf(accounts[0]).then(function(t) {acct0bal = t;});
    undefined
    truffle(development)> acct0bal.toNumber();
    5001
    truffle(development)> token.balanceOf(accounts[1]).then(function(t) {acct1bal = t;});
    undefined
    truffle(development)> acct1bal.toNumber();
    0

truffle transaction Debug:

olidity built-ins:

msg: {

data: hex'a9059cbb0000000000000000000000007ef620e82589275cdb4a45821ecfdb883e8739d400000000000000000000000000000000000000000000000000000000000003e8',

sig: 0xa9059cbb,

sender: 0xb1A934bed6cF1B0093DB1290CB0F9f4eEaD05785,

value: 0

}

tx: {

origin: 0xb1A934bed6cF1B0093DB1290CB0F9f4eEaD05785,

gasprice: 20000000000

}

block: {

coinbase: 0x0000000000000000000000000000000000000000,

difficulty: 0,

gaslimit: 6721975,

number: 6,

timestamp: 1625597037

}

this: 0x46bd6d8Eb8033e2edaA33AfaD522A70347778617 (KairosToken)

now: 1625597037

Contract variables:

name: ''

symbol: ''

totalSupply: 0

fullPotential: 0

lifeExpectancy: 0

potentialSupply: 0

balanceOf: Map(2) {

0xb1A934bed6cF1B0093DB1290CB0F9f4eEaD05785 => 3001,

0x7EF620E82589275CDB4A45821ecfDB883E8739d4 => 2000

}

minted: Map(0) {}

potential: Map(0) {}

Local variables:

_to: 0x7EF620E82589275CDB4A45821ecfDB883E8739d4

_value: 1000

Answer

Attribution
Source : Link , Question Author : WhenDingo , Answer Author : Ioana Roceanu