假设我正在使用页面对象模式来构建我的angularjs protractor e2e测试套件。
我会尽可能地将页面对象代码分开放在不同的文件中。
实现页面对象继承有哪些好的方法？经典的javascript继承？基于Object.create()的继承？其他？
应该将期望值保留在页面对象中吗？还是更喜欢Martin Fowler optinion通过将它们移动到一个断言库？在这种情况下，这个JavaScript-Node.js技术栈会是什么样子？
我已经准备了live jsfiddle playground here，所以你可以在上面尝试进行改进。
或者只需在答案中粘贴代码，我将在下面粘贴jsfiddle内容以便更清晰地阅读：
loginPage.js
"use strict";
// A Page Object is a Singleton, so no need to constructors or classic js inheritance,
// please tell me if I'm wrong or what's the utility of creating a (new LoginPage())
// every time a spec need to use this login page.
var loginPage = {
// Page Object Elements
userElm: $('.user.loginPage'),
// Page Object Assertions
// Martin Fowler [doesn't favor](http://martinfowler.com/bliki/PageObject.html)
// assertions in page objects, I'm open to suggestions on how to move
// the assertions away from the Page Object and see how an assertion library
// could like like in protractor.
assertInputsDisplayed: function() {
return ('Assertion: this.userElm: '+this.userElm);
},
// Page Object Actions
get: function () {
return ('navigating to LoginPage with userElm: '+this.userElm);
}
};
module.exports.loginPage = loginPage;
loginDialog.js
"use strict";
var loginPage = require('./loginPage.js').loginPage;
var helpers = require('./helpers.js');
// Inherit properties from another Page Object
var loginDialog = helpers.extend({}, Object.create(loginPage), {
// Page Object Elements
userElm: $('.user.loginDialog'),
// Page Object Actions
get: function () {
return ('navigating to LoginDialog with userElm: '+this.userElm);
},
logout: function () {
return ('logging out of Dialog. user was: '+this.userElm);
}
});
module.exports.loginDialog = loginDialog;
helpers.js
"use strict";
// some helper to avoid adding an external dependency for now
var extend = function(target) {
var sources = [].slice.call(arguments, 1);
sources.forEach(function (source) {
for (var prop in source) {
target[prop] = source[prop];
}
});
return target;
};
usage.js
"use strict";
// Mock $() for easy unit testing this on nodejs REPL
global.$ = function(args) { return ('$BUILT '+args); };
var loginPage = require('./loginPage.js').loginPage;
var loginDialog = require('./loginDialog.js').loginDialog;
console.log(loginPage.userElm); //=> '$BUILT .user.loginPage'
console.log(loginDialog.userElm); //=> '$BUILT .user.loginDialog'
console.log(loginPage.get()); //=> 'navigating to LoginPage with userElm: $BUILT .user.loginPage'
console.log(loginDialog.get()); //=> 'navigating to LoginPage with userElm: $BUILT .user.loginDialog'
console.log(loginPage.assertInputsDisplayed()); //=> 'LoginPage assertion: this.userElm: $BUILT .user.loginPage'
console.log(loginDialog.assertInputsDisplayed()); //=> 'LoginPage assertion: this.userElm: $BUILT .user.loginDialog'
//loginPage.logout(); //=> TypeError: Object #<Object> has no method 'logout'
console.log(loginDialog.logout()); //=> 'logging out of Dialog. user was: $BUILT .user.loginDialog'