73 lines
2.7 KiB
JavaScript
73 lines
2.7 KiB
JavaScript
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const { accounts, contract, web3 } = require('@openzeppelin/test-environment');
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const { ether, expectEvent } = require('@openzeppelin/test-helpers');
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const gsn = require('@openzeppelin/gsn-helpers');
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const { expect } = require('chai');
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const GSNRecipientERC20FeeMock = contract.fromArtifact('GSNRecipientERC20FeeMock');
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const ERC20 = contract.fromArtifact('ERC20');
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const IRelayHub = contract.fromArtifact('IRelayHub');
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describe('GSNRecipientERC20Fee', function () {
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const [ sender ] = accounts;
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const name = 'FeeToken';
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const symbol = 'FTKN';
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beforeEach(async function () {
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this.recipient = await GSNRecipientERC20FeeMock.new(name, symbol);
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this.token = await ERC20.at(await this.recipient.token());
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});
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describe('token', function () {
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it('has a name', async function () {
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expect(await this.token.name()).to.equal(name);
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});
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it('has a symbol', async function () {
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expect(await this.token.symbol()).to.equal(symbol);
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});
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it('has 18 decimals', async function () {
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expect(await this.token.decimals()).to.be.bignumber.equal('18');
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});
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});
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context('when called directly', function () {
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it('mock function can be called', async function () {
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const { logs } = await this.recipient.mockFunction();
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expectEvent.inLogs(logs, 'MockFunctionCalled');
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});
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});
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context('when relay-called', function () {
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beforeEach(async function () {
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await gsn.fundRecipient(web3, { recipient: this.recipient.address });
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this.relayHub = await IRelayHub.at('0xD216153c06E857cD7f72665E0aF1d7D82172F494');
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});
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it('charges the sender for GSN fees in tokens', async function () {
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// The recipient will be charged from its RelayHub balance, and in turn charge the sender from its sender balance.
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// Both amounts should be roughly equal.
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// The sender has a balance in tokens, not ether, but since the exchange rate is 1:1, this works fine.
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const senderPreBalance = ether('2');
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await this.recipient.mint(sender, senderPreBalance);
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const recipientPreBalance = await this.relayHub.balanceOf(this.recipient.address);
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const { tx } = await this.recipient.mockFunction({ from: sender, useGSN: true });
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await expectEvent.inTransaction(tx, IRelayHub, 'TransactionRelayed', { status: '0' });
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const senderPostBalance = await this.token.balanceOf(sender);
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const recipientPostBalance = await this.relayHub.balanceOf(this.recipient.address);
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const senderCharge = senderPreBalance.sub(senderPostBalance);
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const recipientCharge = recipientPreBalance.sub(recipientPostBalance);
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expect(senderCharge).to.be.bignumber.closeTo(recipientCharge, recipientCharge.divn(10));
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});
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});
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});
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