我无法理解为什么这不起作用。我有一个模块,它使用native nodejs http模块发送包含一些有效负载的HTTP POST请求。我正在使用sinon对请求方法进行存根,并为请求和响应流传递PassThrough流。
DummyModule.js
const http = require('http');
module.exports = {
getStuff: function(arg1, arg2, cb) {
let request = http.request({}, function(response) {
let data = '';
response.on('data', function(chunk) {
data += chunk;
});
response.on('end', function() {
// spy should be called here
cb(null, "success");
});
});
request.on('error', function(err) {
cb(err);
});
// payload
request.write(JSON.stringify({some: "data"}));
request.end();
}
};
test_get_stuff.js
const sinon = require('sinon');
const http = require('http');
const PassThrough = require('stream').PassThrough;
describe('DummyModule', function() {
let someModule,
stub;
beforeEach(function() {
someModule = require('./DummyModule');
});
describe('success', function() {
beforeEach(function() {
stub = sinon.stub(http, 'request');
});
afterEach(function() {
http.request.restore()
});
it('should return success as string', function() {
let request = new PassThrough(),
response = new PassThrough(),
callback = sinon.spy();
response.write('success');
response.end();
stub.callsArgWith(1, response).returns(request);
someModule.getStuff('arg1', 'arg2', callback);
sinon.assert.calledWith(callback, null, 'success');
});
});
});
没有调用间谍,测试因AssertError: expected spy to be called with arguments
而失败。因此,response.on('end', ...)
不会被调用,因此测试失败。是否需要以某种方式触发响应流上的结束事件?
答案 0 :(得分:1)
现在正在运作。首先,需要使用emit method发出事件。 其次,事件需要在someModule.getStuff(...)方法调用之后立即发出:
...
someModule.getStuff('arg1', 'arg2', callback);
response.emit('data', 'success');
response.emit('end');
sinon.assert.calledWith(callback, null, 'success');
...