Unit Testing ERC721

Smart Contracts
,
1

I am trying to unit test one of my contracts; ERC721. I am getting the below error...

AssertionError: expected <BN: 1> to be false, highlighting the below line in the error message.

"assert.isFalse(balance.valueOf(), ZERO_BALANCE, "Inital balance should be 0 credits");"

What is the problem here? Am i writing the unit test incorrectly?

I want to test that if an account tries to mint but doesn't have the authority to mint, it will throw an error to say "you don't have the authority to mint"

Account[0] is the authoritative account.

  it('should not mint for non minter role', async () => {
    const MinterAddress = accounts[1];
    
    // Balance of non minter address
    let balance = await ERC721Instance.balanceOf.call(MinterAddress);
    
    assert.isFalse(balance.valueOf(), ZERO_BALANCE, "Inital balance should be 0 credits");
    
    await expectRevert(
      ERC721Instance.mint(MinterAddress, 1, tokenURI, digest, { from: MinterAddress }),
      `is missing role ${MINTER_ROLE}`,
    );
    
    // Balance should still be zero
    balance = await ERC721Instance.balanceOf.call(MinterAddress);
    
    assert.equal(balance.valueOf(), ZERO_BALANCE, "Inital balance should be 0 credits");
    
    await ERC721Instance.grantRole(MINTER_ROLE, MinterAddress);
    
    // Retry mint
    await ERC721Instance.mint(MinterAddress, 1, tokenURI, digest, { from: MinterAddress });
    
    balance = await ERC721Instance.balanceOf.call(MinterAddress);
    
    assert.equal(balance.valueOf(), 1, "Minted balance should be 1 asset token");
  });