Mocha/Chai测试预期与实际的对象数组

Question

当两者都是对象数组时,断言预期结果是否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集是否与预期相同,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？

Answer 1

如您所述,对于集合,您可以使用:

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

如果你想确保有中没有成员expected,在没有actual的话:

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

最后,如果你要比较对象,你可能想深入比较:

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

例如:

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

Answer 2

Chai有一个成员匹配器可以满足我的需求:

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