Javascript 使用jest模拟jquery单击事件
我正在尝试为下面的javascript函数编写单元测试Javascript 使用jest模拟jquery单击事件,javascript,node.js,jestjs,Javascript,Node.js,Jestjs,我正在尝试为下面的javascript函数编写单元测试 const $ = require("jquery"); const Toggle = (function (toggle, $) { toggle.clickHandler = () => { $(".active").not(this).removeClass("active").next().hide(300); $(this).toggleCla
const $ = require("jquery");
const Toggle = (function (toggle, $) {
toggle.clickHandler = () => {
$(".active").not(this).removeClass("active").next().hide(300);
$(this).toggleClass("active");
if (false == $(this).next().is(":visible")) {
$("#accordion > ul").slideUp(300);
}
$(this).next().slideToggle(300);
};
$("#accordion > li > div").on("click", toggle.clickHandler);
return {
toggle,
};
})({}, $);
module.exports = Toggle.toggle;
我写了下面的笑话测试
const toggle = require("./toggle");
const $ = require("jquery");
jest.dontMock("jquery");
jest.dontMock("./acc");
describe("Toggle", () => {
it("It should call click handler", () => {
document.body.innerHTML = ` <ul id="accordion">
<li>
<div>Sports</div>
<ul>
<li><a href="#">Golf</a></li>
<li><a href="#">Cricket</a></li>
<li><a href="#">Football</a></li>
</ul>
</li>
</ul>
`;
const spy = jest.spyOn(toggle, "clickHandler");
$("div").trigger("click");
$("div").trigger("click");
expect(spy).toBeCalledTimes(2);
});
});
const toggle=require(“./toggle”);
const$=require(“jquery”);
jest.dontMock(“jquery”);
开玩笑的唐托克(“附件”);
描述(“切换”,()=>{
它(“它应该调用click处理程序”,()=>{
document.body.innerHTML=`
-
体育
`;
const spy=jest.spyOn(切换“clickHandler”);
$(“div”)。触发器(“单击”);
$(“div”)。触发器(“单击”);
期望(间谍)。被催缴的时间(2);
});
});
但是当我运行测试时,我得到了以下错误
预期调用数:2收到的调用数:0当您在测试文件开始时从js文件导入时,您将在那时运行所有可调用的代码 这意味着,即使在测试初始化之前,
$(“#accordion>li>div”).on(“click”,toggle.clickHandler)代码>执行,此时DOM中有注释,单击处理程序未注册
正确的方法是公开一个方法来附加click处理程序,并从测试/代码中调用它。比如:
toggle.js
const $ = require("jquery");
const Toggle = (function (toggle, $) {
toggle.clickHandler = () => {
$(".active").not(this).removeClass("active").next().hide(300);
$(this).toggleClass("active");
if (false == $(this).next().is(":visible")) {
$("#accordion > ul").slideUp(300);
}
$(this).next().slideToggle(300);
console.log("clicked!");
};
toggle.attach = () => { // exposing method to attach handlers
$("#accordion > li > div").on("click", toggle.clickHandler);
};
return {
toggle
};
})({}, $);
module.exports = Toggle.toggle;
describe("Toggle", () => {
it("It should call click handler", async () => {
document.body.innerHTML = ` <ul id="accordion">
<li>
<div>Sports</div>
<ul>
<li><a href="#">Golf</a></li>
<li><a href="#">Cricket</a></li>
<li><a href="#">Football</a></li>
</ul>
</li>
</ul>
`;
const spy = jest.spyOn(toggle, "clickHandler");
toggle.attach(); // attach handlers
$("div").trigger("click");
$("div").trigger("click");
return new Promise((res, rej) => {
expect(spy).toBeCalledTimes(2);
res();
});
});
});
toggle.test.js
const $ = require("jquery");
const Toggle = (function (toggle, $) {
toggle.clickHandler = () => {
$(".active").not(this).removeClass("active").next().hide(300);
$(this).toggleClass("active");
if (false == $(this).next().is(":visible")) {
$("#accordion > ul").slideUp(300);
}
$(this).next().slideToggle(300);
console.log("clicked!");
};
toggle.attach = () => { // exposing method to attach handlers
$("#accordion > li > div").on("click", toggle.clickHandler);
};
return {
toggle
};
})({}, $);
module.exports = Toggle.toggle;
describe("Toggle", () => {
it("It should call click handler", async () => {
document.body.innerHTML = ` <ul id="accordion">
<li>
<div>Sports</div>
<ul>
<li><a href="#">Golf</a></li>
<li><a href="#">Cricket</a></li>
<li><a href="#">Football</a></li>
</ul>
</li>
</ul>
`;
const spy = jest.spyOn(toggle, "clickHandler");
toggle.attach(); // attach handlers
$("div").trigger("click");
$("div").trigger("click");
return new Promise((res, rej) => {
expect(spy).toBeCalledTimes(2);
res();
});
});
});
description(“切换”),()=>{
它(“它应该调用click处理程序”,async()=>{
document.body.innerHTML=`
-
体育
`;
const spy=jest.spyOn(切换“clickHandler”);
toggle.attach();//附加处理程序
$(“div”)。触发器(“单击”);
$(“div”)。触发器(“单击”);
返回新承诺((res,rej)=>{
期望(间谍)。被催缴的时间(2);
res();
});
});
});
这难道没有意义吗?附加事件侦听器后,您正在加载html。@DipenShah:谢谢您的评论。我不明白你能不能解释得更详细一点补充回答。