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

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

import { BigNumber } from 'ethers';
import { callPromise } from '../call-promise';
import { getBalanceChanges } from './changeEtherBalances';
import { getAddresses } from './misc/balance';
export function supportChangeBalances(Assertion) {
    Assertion.addMethod('changeBalances', function (accounts, balanceChanges) {
        callPromise(this);
        const isNegated = this.__flags.negate === true;
        const derivedPromise = this.callPromise.then(() => {
            if (!('txResponse' in this)) {
                throw new Error('The changeBalances matcher must be called on a transaction');
            }
            return Promise.all([
                getBalanceChanges(this.txResponse, accounts, { includeFee: true }),
                getAddresses(accounts)
            ]);
        }).then(([actualChanges, accountAddresses]) => {
            const isCurrentlyNegated = this.__flags.negate === true;
            this.__flags.negate = isNegated;
            this.assert(actualChanges.every((change, ind) => change.eq(BigNumber.from(balanceChanges[ind]))), `Expected ${accountAddresses} to change balance by ${balanceChanges} wei, ` +
                `but it has changed by ${actualChanges} wei`, `Expected ${accountAddresses} to not change balance by ${balanceChanges} wei,`, balanceChanges.map((balanceChange) => balanceChange.toString()), actualChanges.map((actualChange) => actualChange.toString()));
            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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