Lesson 12 testing _burn function ERC20

[obc92]

I have been trying to test the _burn function from the openZeppelin contract but once called from the test it sends me the error that the function does not exist, anyone understand why?
Test code:

describe("Burn amount", async function () {//
                it("Burning from the second account", async function () {
                    const {second} = await getNamedAccounts()
                    console.log(`Second: ${second}`)
                    
                    await OurToken.transfer(second, Quantity)
                    const balanceAddr1 = await OurToken.balanceOf(second)
                    console.log(`Balance: ${balanceAddr1}`)

                    await OurToken._burn(second, 1000000)
                    const balanceburn = await OurToken.balanceOf(second)
                    console.log(`BalanceBurned: ${balanceburn}`)
                    assert.equal(balanceburn, 0)

                    const InitSupply = await OurToken.totalSupply()
                    console.log(`NewSupply: ${InitSupply}`)
                    assert.equal(InitSupply, "4000000")
                })
              })

Initialpply is 5000000, and Im sending 1000000 to a second account that calls _burn() to burn them. And at the end the suplly = 4000000.
It is clear for me that the _burn() function exists in the openZeppelin contract, so I don't understand what I am doing wring:

function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

Thansk guys I appreciate you all.

[adityabhattad2021]

You are getting error because _burn function is an internal function

function _burn(address account, uint256 amount) internal virtual {...}

which means that it can only be called within the contract.

[adityabhattad2021]

Hope this helps!

[obc92]

Thank you! didn't realize. I created a burn() function inside the contract that calls _burn and now it works!