node.js - Mocha 并非永远不会调用“then”函数进行断言检查

Question

我在 Mocha 中编写了以下测试用例，其中我的代码使用 Q 模块。

var expect = require("chai").expect;
var utils = require("../Utils.js");
var utils1 = require("../a.js");
var sinon = require('sinon');
var request = require('requestretry');
var querySys = require('../b.js');
var Q = require("q");

describe("Sample", function () {
    var results;
    describe("#get()", function () {
        before(function (done) {
            done();
        });
        it("equal", function () {
            var deferred = Q.defer();
            var responseData = {};
            responseData.code = 200;
            responseData.data = [{a:1,b:2}];
            deferred.resolve(responseData);
            //querySys1 method uses Q promises. That is how I stubbed the response.
            sinon.stub(querySys, 'querySys1').returns(deferred.promise);

            //get function internally calls querySys1. Hence I have stubbed that.
            results = utils1.get(specification);
            results.then(function (data) {
                //Here I do see data coming as {in:1, out:1}. But still the test case is passing when compare it with {}.
                console.log(data);
                //Ideally, it should have failed. But it is passing.
                expect(data).to.be.equal({});
            });
        });
        after(function (done) {
            done();
        })
    });
});

所以，如果你看到的话，我正在尝试在 results.then 部分中进行断言检查。我已经打印了我收到的回复。这正如预期的那样。 但我故意尝试匹配错误的值，但测试用例仍然通过。

Answer 1

由于您的测试不包含回调，因此执行将通过主 block 运行并声明测试已通过，而无需等待 then 函数的结果。您需要让 mocha 知道等待回调:

it("equal", function (done) {
    ...
    results.then(function (data) {
        console.log(data);
        expect(data).to.be.equal({});
        return done();
    });
});