这篇文章会通过具体例子介绍chakram模块的常用验证方法。
HTTP GET
使用chakram.get(url, params)完成一次HTTP GET请求。此方法返回的promise对象最终会被resolve成一个ChakramResponse对象。
Chakram把HTTP请求的结果封装到了一个ChakramResponse对象里面。这个对象常用的属性有
- body - The response body
- url - The request's original URL
- responseTime - The time taken to make the request (including redirects) at millisecond resolution
- response - An http.IncomingMessage object
const chakram = require('../node_modules/chakram/lib/chakram.js'),
expect = chakram.expect;
describe("Simple Request", function(){
let testURL = "https://api.douban.com/v2/movie/subject/26794215";
it("should allow checking of HTTP headers", function () {
return chakram.get(testURL).then(function(response){
console.log(response.body);
console.log(response.url);
console.log(response.responseTime);
console.log(response.response);
});
});
})
HTTP post
使用chakram.post(url, data, params)完成一次HTTP POST请求。此方法返回的promise对象最终会被resolve成一个ChakramResponse对象。
const chakram = require('../node_modules/chakram/lib/chakram.js'),
expect = chakram.expect;
describe("Test HTTP POST", function(){
var postRequest;
before(function() {
postRequest = chakram.post("http://httpbin.org/post", {
nba : "nba",
cba : "cba"
});
});
it("should ensure matches json exactly", function () {
return expect(postRequest).to.have.json('json',{
nba : "nba",
cba : "cba"
})
}
)
})
Three Promises Related Methods
chakram.all
chakram.all(promiseArray)接受promises数组作为参数，返回一个promise，并且要在数组中所有promises被完成之后，promise状态才会变为fulfilled，表示异步操作成功。可以用于对多个promises一起处理。
it("should return a different username on each request", function () {
this.timeout(10000);
var multipleResponses = [];
for(var ct = 0; ct < 5; ct++) {
multipleResponses.push(chakram.get("http://api.randomuser.me/0.6?gender=female"));
}
return chakram.all(multipleResponses).then(function(responses) {
var returnedUsernames = responses.map(function(response) {
return response.body.results[0].user.username;
});
while (returnedUsernames.length > 0) {
var username = returnedUsernames.pop();
expect(returnedUsernames.indexOf(username)).to.equal(-1);
}
});
});
可以实现两个response的值比对
it("should support an offset parameter", function () {
var first = chakram.get("https://api.spotify.com/v1/search?q=random&type=artist&limit=1");
var second = chakram.get("https://api.spotify.com/v1/search?q=random&type=artist&limit=1&offset=1");
expect(first).to.have.json("artists.offset", 0);
expect(second).to.have.json("artists.offset", 1);
return chakram.all([first,second]).then(function(responses) {
expect(responses[0].body.artists.items[0].id).not.to.equal(responses[1].body.artists.items[0].id);
return chakram.wait();
});
});
chakram.wait
chakram.wait()返回一个promise，并且要在所有chakram expectations被完成之后，promise状态才会变为fulfilled，表示异步操作成功。这个方法通过记录在it()中所有chakram expectations的调用情况以及等待所有的expectation的完成，之后才使得返回的promise fulfilled，达到自动等待异步测试完成的效果。
it("should support auto waiting for tests", function() {
var response = chakram.get("http://httpbin.org/get");
expect(response).to.have.status(200);
expect(response).not.to.have.status(404);
return chakram.wait();
});
chakram.waitFor
chakram.waitFor(promiseArray)接受promises数组作为参数，返回一个promise，并且要在数组中所有promises被完成之后，promise状态才会变为fulfilled，表示异步操作成功。这个方法和chakram.all很类似，除了这个返回的promise状态变为fulfilled的条件是数组中最后一个promise的状态变为fulfilled，而不是全部数组的promise。
it("should support grouping multiple tests", function () {
var response = chakram.get("http://httpbin.org/get");
return chakram.waitFor([
expect(response).to.have.status(200),
expect(response).not.to.have.status(404)
]);
});
两种自定义assertion方法
chakram.addProperty
使用chakram.addProperty(name, plugin)可以给Chakram添加不带参数的验证方法。
第二个参数plugin的类型是function，这个function接受一个ChakramResponse对象作为参数，这样就可以在方法体内对这个对象进行处理判断。
chakram.addMethod
使用chakram.addMethod(name, plugin)可以给Chakram添加带参数的验证方法。第二个参数plugin的类型是function，这个function接受一个或多个参数，且第一个参数必须是ChakramResponse对象，这样就可以在方法体内对这个对象进行处理判断。
下面是这两个方法使用的例子
const chakram = require('../node_modules/chakram/lib/chakram.js'),
expect = chakram.expect;
describe("Check Wolf Warrir 2", function(){
before(function(){
chakram.addProperty("WJisDirector", function (respObj) {
let hostMatches = /1000525/.test(respObj.body.directors[0].id);
this.assert(hostMatches,
'expected director of this movie is: '+respObj.body.directors[0].id,
'expected director of this movie is: '+respObj.body.directors[0].id
);
});
chakram.addMethod("haveHighAverageRating", function (respObj, average) {
let ratingRangeResult = respObj.body.rating.average >= average;
this.assert(ratingRangeResult,
'expected average rating of this movie is: '+ respObj.body.rating.average
);
});
chakram.addMethod("BeOnYearAt", function (respObj, year) {
expect(respObj).to.have.json("year", year);
});
});
it("should be a movie directed by WuJing", function () {
let response = chakram.get("https://api.douban.com/v2/movie/subject/26363254");
return chakram.waitFor([
expect(response).to.be.WJisDirector,
expect(response).to.be.BeOnYearAt("2017"),
expect(response).to.have.haveHighAverageRating(7)
])
});
})
