Solidity returns totalSupply() as 1 trillion + the 9 decimals as 1trillion concat with 9 zeroes.
So when I try to do a mocha test to check the supply is 1T, it fails because the number has 9 extra zeroes at the end and no decimal point.
So how to change
BigNumber { value: "1000000000000000000000" } to 1000000000000 so my test passes.
This is my test which fails;
it('Should correctly set totalSupply to: 1T', async () => {
const totalSupply = await hardhatToken.totalSupply();
var tokenBalance = totalSupply.toString();
console.log(tokenBalance);
console.log(ethers.BigNumber.from(totalSupply, 9));
expect(totalSupply).should.be.bignumber.equal(1000000000000);
});
I have the BN.js library but I cant work out the process! I'd like to do it properly without just chopping off the last 9 digits as there will be other tests to write with similar issues.
I write my test in a way that I calculate decimals separately and In assertion, I concatenate decimals zeros with value.
it('Should correctly set totalSupply to: 1T', async () => {
const totalSupply = await hardhatToken.totalSupply();
const decimals = ethers.BigNumber.from(10).pow(9);
expect(totalSupply).to.equal(
ethers.BigNumber.from(1_000_000_000_000).mul(decimals)
);
});