Account balance does not decrease after send ether

Question

For example here is my example function in smart contract:

function adoptCreeptomas(uint256 beastQuantity, address referrer
) public payable whenNotPaused {
    msg.sender.transfer(50);
}

And then I try to test this contract:

describe("adopted creeptoma", async function() {
    it('adopted', async function() {
        let instance = await CreeptomaPresale.deployed();

        let pre = convertEther(getBalance(investor));
        await instance.adoptCreeptomas.call(beastQuantity, 0 {from: investor, value: ether(100)});
        let after = convertEther(getBalance(investor));
        console.log("before: " + pre + "--after: " + after);
    });
});

The printing log is: before: 100--after: 100

Here is my getBalance method:

export function getBalance(address) {
    return web3.eth.getBalance(address)
}

I don't know why balance of account doesn't decrease. Please help me.

Thanks

Answer 1

You are saying call() when you adoptCreeptomas. call() makes it explicitly a read-only, not state-changing, dry-run operation. It is not signed or sent to the network for mining, so the next time you look, nothing has changed.

Have a look over here for detailed explanation. What is the difference between a transaction and a call?

Hope it helps.