Mocha / Chai测试预期与实际的对象数组

时间:2014-01-01 00:11:35

标签: javascript testing mocha matcher chai

当两者都是对象数组时,断言预期结果与实际结果相匹配的最佳方法是什么?我的直接想法是使用Array原型过滤器并检查交叉点是否与预期的大小相同,即:

describe('select',function(){
  it("should return selected columns", function(done) {
    var query = "select lunchTime, name";

    var actual = ... results of the query, an array of anonymous objects ...

    // expected results
    var expected = [{"lunchTime": "12:00:00", "name": "John"}, 
                   {"lunchTime": "12:00:00", "name": "Dave"}, 
                   {"lunchTime": "13:00:00", "name": "Sally"}, 
                   {"lunchTime": "12:00:00", "name": "Ben"}, 
                   {"lunchTime": "12:00:00", "name": "Dana"}, 
                   {"lunchTime": "13:00:00", "name": "Mike"}];

    var intersection = actual.filter(function(n) {
        return expected.indexOf(n) != -1
    });

    expect(intersection).to.have.length(expected.length);
    expect(actual).to.have.length(expected.length);
  });
});

这种方法有意义吗?有没有更好的方法断言查询结果符合预期?

2 个答案:

答案 0 :(得分:11)

如您所述,对于集合,您可以使用:

expect(actual).to.have.members(expected);

如果您想确保actual中没有expected之内的成员,那么:

expect(actual).to.have.same.members(expected);

最后,如果您要比较对象,您可能需要深入比较:

expect(actual).to.deep.have.same.members(expected);

e.g:

expect([{a:'a'}, {a:'b'}]).to.deep.have.same.members([{a:'a'}, {a:'b'}]);

答案 1 :(得分:7)

Chai有members matcher可以满足我的需要:

expect(actual).to.have.members(expected);