松露测试中的时间延迟答案

【问题标题】：Time delay in Truffle Tests松露测试中的时间延迟
【发布时间】：2018-08-21 08:44:19
【问题描述】：

我正在为我的合同编写测试用例，并且必须延迟断言检查，因为它对时间敏感。 getCompletedCampaigns() 将包含截止日期已过的活动的地址。

it("Time sensitive check", async () => {

    var deadLine = Math.round(Date.now() / 1000) + 3;
    let eventDetails = await contract.createCampaign("Campaign name",deadLine,
    {
        from: accounts[0]
    });

    addressFromEvent = eventDetails['logs'][1]['args']['campaignAddress'];

    async function checker() {
        let deployedCampaigns = await factory.getCompletedCampaigns();
        assert.equal(addressFromEvent, deployedCampaigns[0]);
    }

    function timeout(ms) {
        return new Promise(resolve => setTimeout(resolve, ms));
    }

    async function sleep() {
        await timeout(5000);
        return checker();
    }

    sleep();
});

即使断言应该失败，测试也会通过。断言发生在测试套件完成执行所有测试并强制提示来自truffle develop 控制台，因为如果它失败了。在下面的测试中，我故意没有通过测试。

Contract: Testing CrowdCoin
    ✓ CampaignFactory deployment
    ✓ Create a new Campaign (168ms)
    ✓ Get ongoing Campaigns (246ms)
    ✓ Get completed Campaigns (189ms)


  4 passing (1s)

truffle(develop)> 
/home/vagrant/code/test/crowdcoin.test.js:82
            assert.equal(0, deployedCampaigns[1]);
          ^
AssertionError: expected 0 to equal '0x806ea81c279b6000b9fd9f14d2845dec87fc3544'
    at checker (/home/vagrant/code/test/crowdcoin.test.js:82:11)
    at process._tickCallback (internal/process/next_tick.js:68:7)

我如何确保测试检查随着时间延迟发生？

【问题讨论】：

标签： javascript ethereum truffle

【解决方案1】：

it("Time sensitive check", async () => {

    var deadLine = Math.round(Date.now() / 1000) + 3;
    let eventDetails = await contract.createCampaign("Campaign name",deadLine,
    {
        from: accounts[0]
    });

    function timeout(ms) {
        return new Promise(resolve => setTimeout(resolve, ms));
    }

    await timeout(5000);

    addressFromEvent = eventDetails['logs'][1]['args']['campaignAddress'];
    let deployedCampaigns = await factory.getCompletedCampaigns();
    await assert.equal(addressFromEvent, deployedCampaigns[0]);
});

通过将整个延迟逻辑移动到不同的方法和所有以 await 开头的逻辑语句，除非 timeout() 完成，否则所述逻辑语句的执行和测试完成不会完成。

【讨论】：

【解决方案2】：

实际上您可以尝试在@openzeppelin/test-helper 中使用time 来加速您的测试用例，因为您无需等待在此测试用例上运行3 秒。

const { time } = require("@openzeppelin/test-helpers");

it("Time sensitive check", async () => {
    let duration = time.duration.seconds(3);
    let eventDetails = await contract.createCampaign("Campaign name",duration,
    {
        from: accounts[0]
    });

    await time.increase(duration);

    addressFromEvent = eventDetails['logs'][1]['args']['campaignAddress'];
    let deployedCampaigns = await factory.getCompletedCampaigns();
    await assert.equal(addressFromEvent, deployedCampaigns[0]);
});

这对在区块链中测试时间戳更有意义。

文档：https://docs.openzeppelin.com/test-helpers/0.5/api#time

@openzeppelin 团队如何处理测试用例的示例，您可以查看： https://github.com/OpenZeppelin/openzeppelin-contracts/blob/24a0bc23cfe3fbc76f8f2510b78af1e948ae6651/test/token/ERC20/utils/TokenTimelock.test.js

【讨论】：