我正在对Aurelia项目中的一个组件进行单元测试。我想在我的单元测试中访问我的组件的 viewModel，但到目前为止没有任何运气。
我遵循了 https://aurelia.io/docs/testing/components#manually-handling-lifecycle 提供的示例，但我不断得到component.viewModel是undefined.
这是单元测试：
describe.only('some basic tests', function() {
let component, user;
before(() => {
user = new User({ id: 100, first_name: "Bob", last_name: "Schmoe", email: 'joe@schmoe.com'});
user.save();
});
beforeEach( () => {
component = StageComponent
.withResources('modules/users/user')
.inView('<user></user>')
.boundTo( user );
});
it('check for ', () => {
return component.create(bootstrap)
.then(() => {
expect(2).to.equal(2);
return component.viewModel.activate({user: user});
});
});
it('can manually handle lifecycle', () => {
return component.manuallyHandleLifecycle().create(bootstrap)
.then(() => component.bind({user: user}))
.then(() => component.attached())
.then(() => component.unbind() )
.then(() => {
expect(component.viewModel.name).toBe(null);
return Promise.resolve(true);
});
});
afterEach( () => {
component.dispose();
});
});
这是我得到的错误：
1) my aurelia tests
can manually handle lifecycle:
TypeError: Cannot read property 'name' of undefined
下面是定义component对象上的viewModel的行，但前提是设置了aurelia.root.controllers.length。我不确定如何在我的 aurelia 代码中设置控制器，或者我是否需要这样做。
我想我的问题是： 如何在单元测试中访问组件的视图模型？
编辑 #2：
我还想指出，您自己的答案与我在评论中首次提出的解决方案基本相同。这相当于直接实例化视图模型，而不验证组件是否实际工作。
编辑：
我在本地尝试了 karma+webpack+mocha 设置(因为 webpack 是当今流行的选择(，并且有一些注意事项可以使其正常工作。我不确定您的其余设置是什么，所以我无法准确地告诉您错误在哪里(如果您告诉我有关您的设置的更多信息，我可能会指出这一点(。
无论如何，这里有一个使用 karma+webpack+mocha 的工作设置，可以正确验证绑定和渲染：
https://github.com/fkleuver/aurelia-karma-webpack-testing
测试代码：
import './setup';
import { Greeter } from './../src/greeter';
import { bootstrap } from 'aurelia-bootstrapper';
import { StageComponent, ComponentTester } from 'aurelia-testing';
import { PLATFORM } from 'aurelia-framework';
import { assert } from 'chai';
describe('Greeter', () => {
let el: HTMLElement;
let tester: ComponentTester;
let sut: Greeter;
beforeEach(async () => {
tester = StageComponent
.withResources(PLATFORM.moduleName('greeter'))
.inView(`<greeter name.bind="name"></greeter>`)
.manuallyHandleLifecycle();
await tester.create(bootstrap);
el = <HTMLElement>tester.element;
sut = tester.viewModel;
});
it('binds correctly', async () => {
await tester.bind({ name: 'Bob' });
assert.equal(sut.name, 'Bob');
});
it('renders correctly', async () => {
await tester.bind({ name: 'Bob' });
await tester.attached();
assert.equal(el.innerText.trim(), 'Hello, Bob!');
});
});
迎宾员.html
<template>
Hello, ${name}!
</template>
迎宾员
import { bindable } from 'aurelia-framework';
export class Greeter {
@bindable()
public name: string;
}
设置.ts
import 'aurelia-polyfills';
import 'aurelia-loader-webpack';
import { initialize } from 'aurelia-pal-browser';
initialize();
业力.js
const { AureliaPlugin } = require('aurelia-webpack-plugin');
const { resolve } = require('path');
module.exports = function configure(config) {
const options = {
frameworks: ['source-map-support', 'mocha'],
files: ['test/**/*.ts'],
preprocessors: { ['test/**/*.ts']: ['webpack', 'sourcemap'] },
webpack: {
mode: 'development',
entry: { setup: './test/setup.ts' },
resolve: {
extensions: ['.ts', '.js'],
modules: [
resolve(__dirname, 'src'),
resolve(__dirname, 'node_modules')
]
},
devtool: 'inline-source-map',
module: {
rules: [{
test: /.html$/i,
loader: 'html-loader'
}, {
test: /.ts$/i,
loader: 'ts-loader',
exclude: /node_modules/
}]
},
plugins: [new AureliaPlugin()]
},
singleRun: false,
colors: true,
logLevel: config.browsers && config.browsers[0] === 'ChromeDebugging' ? config.LOG_DEBUG : config.LOG_INFO, // for troubleshooting mode
mime: { 'text/x-typescript': ['ts'] },
webpackMiddleware: { stats: 'errors-only' },
reporters: ['mocha'],
browsers: config.browsers || ['ChromeHeadless'],
customLaunchers: {
ChromeDebugging: {
base: 'Chrome',
flags: [ '--remote-debugging-port=9333' ]
}
}
};
config.set(options);
};
tsconfig.json
{
"compilerOptions": {
"experimentalDecorators": true,
"emitDecoratorMetadata": true,
"importHelpers": true,
"lib": ["es2018", "dom"],
"module": "esnext",
"moduleResolution": "node",
"sourceMap": true,
"target": "es2018"
},
"include": ["src"]
}
包.json
{
"scripts": {
"test": "karma start --browsers=ChromeHeadless"
},
"dependencies": {
"aurelia-bootstrapper": "^2.3.0",
"aurelia-loader-webpack": "^2.2.1"
},
"devDependencies": {
"@types/chai": "^4.1.6",
"@types/mocha": "^5.2.5",
"@types/node": "^10.12.0",
"aurelia-testing": "^1.0.0",
"aurelia-webpack-plugin": "^3.0.0",
"chai": "^4.2.0",
"html-loader": "^0.5.5",
"karma": "^3.1.1",
"karma-chrome-launcher": "^2.2.0",
"karma-mocha": "^1.3.0",
"karma-mocha-reporter": "^2.2.5",
"karma-source-map-support": "^1.3.0",
"karma-sourcemap-loader": "^0.3.7",
"karma-webpack": "^3.0.5",
"mocha": "^5.2.0",
"path": "^0.12.7",
"ts-loader": "^5.2.2",
"typescript": "^3.1.3",
"webpack": "^4.23.1",
"webpack-dev-server": "^3.1.10"
}
}
原答案
如果您手动执行生命周期，则需要自己传入一个可以绑定到:)的 ViewModel
我不记得严格来说需要什么，所以我很确定有一些冗余(例如，传入的两个绑定上下文之一不应该是必需的(。但这是一般的想法：
const view = "<div>${msg}</div>";
const bindingContext = { msg: "foo" };
StageComponent
.withResources(resources/*optional*/)
.inView(view)
.boundTo(bindingContext)
.manuallyHandleLifecycle()
.create(bootstrap)
.then(component => {
component.bind(bindingContext);
}
.then(component => {
component.attached();
}
.then(component => {
expect(component.host.textContent).toEqual("foo");
}
.then(component => {
bindingContext.msg = "bar";
}
.then(component => {
expect(component.host.textContent).toEqual("bar");
};
不用说，由于您自己创建了视图模型(本示例中bindingContext变量(，因此您只需访问声明的变量即可。
为了让它工作，我不得不使用Container：
import { UserCard } from '../../src/modules/users/user-card';
import { Container } from 'aurelia-dependency-injection';
describe.only('some basic tests', function() {
let component, user;
before(() => {
user = new User({ id: 100, first_name: "Bob", last_name: "Schmoe", email: 'joe@schmoe.com'});
user.save();
});
beforeEach(() => {
container = new Container();
userCard = container.get( UserCard );
component = StageComponent
.withResources('modules/users/user-card')
.inView('<user-card></user-card>')
.boundTo( user );
});
it('check for ', () => {
return component.create(bootstrap)
.then(() => {
expect(2).to.equal(2);
return userCard.activate({user: user});
});
});
});