如何让Mocha失败测试

Question

我有以下测试:

it.only('validation should fail', function(done) {
    var body = {
        title: "dffdasfsdfsdafddfsadsa",
        description: "Postman Description",
        beginDate: now.add(3, 'd').format(),
        endDate: now.add(4, 'd').format()
    }


    var rules = eventsValidation.eventCreationRules();
    var valMessages = eventsValidation.eventCreationMessages();

    indicative
        .validateAll(rules, body, valMessages)
        .then(function(data) {
            console.log("SHOULD NOT GET HERE");
            should.fail("should not get here");
            done();

        })
        .catch(function(error) {
            console.log("SHOULD GET HERE");
            console.log(error);
        });
    done();
});

测试执行路径是正确的.当我验证数据时,它会"不应该在这里".测试真的是确保它没有.当我输入非验证数据时,代码会转到"应该在这里".因此验证规则有效.

我正在尝试做的是确保当我有错误的验证数据并且验证时测试失败.然而,当我运行它,因为它有良好的数据,它验证,运行失败,但摩卡仍然标记为传递.如果执行"不应该在这里",我希望它失败.

我试过抛出新的错误("失败"); 也没有运气.在这两种情况下,它实际上似乎也在.catch块中运行代码.

有什么建议？我在类似的问题中找到了解决方案.写这个问题是因为这些解决方案似乎对我不起作用.

Answer 1

你可以打电话assert.fail:

it("should return empty set of tags", function()
{
    assert.fail("actual", "expected", "Error message");
});

此外,如果done()使用参数调用函数,Mocha会认为测试失败.

例如:

it("should return empty set of tags", function(done)
{
    done(new Error("Some error message here"));
});

虽然第一个看起来更清晰.

Answer 2

使用chai-as-promised,使用本机Mocha承诺处理程序.

var chai = require('chai').use(require('chai-as-promised'));
var should = chai.should(); // This will enable .should for promise assertions

您不再需要done,只需返回承诺.

// Remove `done` from the line below
it.only('validation should fail', function(/* done */) {
    var body = {
        title: "dffdasfsdfsdafddfsadsa",
        description: "Postman Description",
        beginDate: now.add(3, 'd').format(),
        endDate: now.add(4, 'd').format()
    }

    var rules = eventsValidation.eventCreationRules();
    var valMessages = eventsValidation.eventCreationMessages();

    // Return the promise
    return indicative
        .validateAll(rules, body, valMessages)
        .should.be.rejected; // The test will pass only if the promise is rejected

    // Remove done, we no longer need it
    // done();
});

Answer 3

在ES2017 async/ await世界chai-as-promised中不需要那么多.虽然简单的拒绝是一个地方chai-as-promised使用起来有点整洁,但catch如果你想更详细地测试错误,则需要a .

it.only('validation should fail', async function(){
    let body = { ... }
    let rules = eventsValidation.eventCreationRules()
    let valMessages = eventsValidation.eventCreationMessages()

    try {
        await indicative.validateAll(rules, body, valMessages)
    } catch (error) {
        expect(error).to.be.instanceOf(Error)
        expect(error.message).to.match(/Oh no!/)
        return
    }
    expect.fail(null, null, 'validateAll did not reject with an error')
    // or throw new Error('validateAll did not reject with an error')
})

async/ await需要Node.js 7.6+或像Babel这样的编译器

Answer 4

这个简单的投掷对我有用

describe('Lead', () => {
  it('should create a new lead', async () => {
     throw 'not implemented'
  })
})