@ethereum-waffle/chai/dist/esm/src/matchers/changeBalance.js

A sweet set of chai matchers for your blockchain testing needs.

import { BigNumber } from 'ethers';
import { getAddressOf } from './misc/account';
import { getBalanceChange } from './changeEtherBalance';
import { callPromise } from '../call-promise';
export function supportChangeBalance(Assertion) {
    Assertion.addMethod('changeBalance', function (account, balanceChange) {
        callPromise(this);
        const isNegated = this.__flags.negate === true;
        const derivedPromise = this.callPromise.then(() => {
            if (!('txResponse' in this)) {
                throw new Error('The changeBalance matcher must be called on a transaction');
            }
            return Promise.all([
                getBalanceChange(this.txResponse, account, { includeFee: true }),
                getAddressOf(account)
            ]);
        }).then(([actualChange, address]) => {
            const isCurrentlyNegated = this.__flags.negate === true;
            this.__flags.negate = isNegated;
            this.assert(actualChange.eq(BigNumber.from(balanceChange)), `Expected "${address}" to change balance by ${balanceChange} wei, ` +
                `but it has changed by ${actualChange} wei`, `Expected "${address}" to not change balance by ${balanceChange} wei,`, balanceChange, actualChange);
            this.__flags.negate = isCurrentlyNegated;
        });
        this.then = derivedPromise.then.bind(derivedPromise);
        this.catch = derivedPromise.catch.bind(derivedPromise);
        this.callPromise = derivedPromise;
        return this;
    });
}
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