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我正在构建一个使用Angular 2，SystemJS和Karma进行测试的Web应用程序。用SystemJS和Karma在Angular 2中加载节点模块
我试图加载节点模块ngrx/store在测试：
import {
it, describe, expect, beforeEach, inject
} from 'angular2/testing';
import { Store } from '@ngrx/store';
describe('Graphs store',() => {
let graphs;
beforeEach(inject([Store], (store: Store<any>) => {
graphs = store.select('graphs');
}));
it('works',() => {
// expect graphs to do something...
});
});
但是，我的测试中失败，出现以下消息：
404: /@ngrx/store
Chrome 48.0.2564 (Mac OS X 10.11.3) ERROR
Error: XHR error (404 Not Found) loading http://localhost:9876/@ngrx/store
其实我有在开发中同样的问题而且事实证明，SystemJS不知道在哪里可以找到@ngrx/store。为了解决这个问题，我做了这个：
System.config({
packages: {
src: {
format: 'register',
defaultExtension: 'js'
}
},
map: { '@ngrx/store' : 'node_modules/@ngrx/store/dist/store.js' } // <-- this
});
我修改了我的Karma填充文件来做同样的事情。一旦运行测试的第二次，我现在得到一个不同的错误：
404: /node_modules/@ngrx/store/dist/store.js
Chrome 48.0.2564 (Mac OS X 10.11.3) ERROR
Error: XHR error (404 Not Found) loading http://localhost:9876/node_modules/@ngrx/store/dist/store.js
这意味着它必须服用我给它考虑了明确的路径，但它仍然无法找到该模块。然而，这是模块的正确路径，并且在浏览器中加载时工作正常。
我很遗憾接下来要做什么。有人能指引我朝着正确的方向吗？
有几件事情需要注意：
- 添加节点模块噶的
files阵列是不是一种选择，因为它的依赖需要与SystemJS - 这仅与节点模块恰好解决了这SystemJS需要他们所在位置的自定义说明。我可以加载其他模块只是在我的测试中细而不提供具体位置，只要SystemJS能够找到它
这里是我的噶配置：
// Set up with the help of
// http://twofuckingdevelopers.com/2016/01/testing-angular-2-with-karma-and-jasmine/
module.exports = function(config) {
config.set({
basePath: '.',
frameworks: ['jasmine'],
files: [
// paths loaded by Karma
{pattern: 'node_modules/angular2/bundles/angular2-polyfills.js', included: true, watched: true},
{pattern: 'node_modules/systemjs/dist/system.src.js', included: true, watched: true},
{pattern: 'node_modules/rxjs/bundles/Rx.js', included: true, watched: true},
{pattern: 'node_modules/angular2/bundles/angular2.dev.js', included: true, watched: true},
{pattern: 'node_modules/angular2/bundles/testing.dev.js', included: true, watched: true},
{pattern: 'karma-test-shim.js', included: true, watched: true},
// paths loaded via module imports
{pattern: 'src/**/*.js', included: false, watched: true},
// paths to support debugging with source maps in dev tools
{pattern: 'src/**/*.ts', included: false, watched: false},
{pattern: 'src/**/*.js.map', included: false, watched: false}
],
// proxied base paths
proxies: {
// required for component assets fetched by Angular's compiler
'/src/': '/base/src/'
},
port: 9876,
logLevel: config.LOG_INFO,
colors: true,
autoWatch: true,
browsers: ['Chrome'],
// Karma plugins loaded
plugins: [
'karma-jasmine',
'karma-coverage',
'karma-chrome-launcher'
],
// // Coverage reporter generates the coverage
// reporters: ['progress', 'dots', 'coverage'],
//
// // Source files that you wanna generate coverage for.
// // Do not include tests or libraries (these files will be instrumented by Istanbul)
// preprocessors: {
// 'src/**/!(*spec).js': ['coverage']
// },
// coverageReporter: {
// reporters:[
// {type: 'json', subdir: '.', file: 'coverage-final.json'}
// ]
// },
singleRun: true
})
};
这里是我的噶垫片：
// Tun on full stack traces in errors to help debugging
Error.stackTraceLimit = Infinity;
jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000;
// // Cancel Karma's synchronous start,
// // we will call `__karma__.start()` later, once all the specs are loaded.
__karma__.loaded = function() {};
System.config({
packages: {
'base/src': {
defaultExtension: 'js',
format: 'register',
map: Object.keys(window.__karma__.files).filter(onlyAppFiles).reduce(createPathRecords, {})
}
},
// This makes it work in the browser, but not in my tests!
paths: { '@ngrx/store' : 'node_modules/@ngrx/store/dist/store.js' }
});
System.import('angular2/src/platform/browser/browser_adapter')
.then(function(browser_adapter) { browser_adapter.BrowserDomAdapter.makeCurrent(); })
.then(function() { return Promise.all(resolveTestFiles()); })
.then(function() { __karma__.start(); }, function(error) { __karma__.error(error.stack || error); });
function createPathRecords(pathsMapping, appPath) {
// creates local module name mapping to global path with karma's fingerprint in path, e.g.:
// './vg-player/vg-player':
// '/base/src/vg-player/vg-player.js?f4523daf879cfb7310ef6242682ccf10b2041b3e'
var pathParts = appPath.split('/');
var moduleName = './' + pathParts.slice(Math.max(pathParts.length - 2, 1)).join('/');
moduleName = moduleName.replace(/\.js$/, '');
pathsMapping[moduleName] = appPath + '?' + window.__karma__.files[appPath];
return pathsMapping;
}
function onlyAppFiles(filePath) {
return /\/base\/src\/(?!.*\.spec\.js$).*\.js$/.test(filePath);
}
function onlySpecFiles(path) {
return /\.spec\.js$/.test(path);
}
function resolveTestFiles() {
return Object.keys(window.__karma__.files) // All files served by Karma.
.filter(onlySpecFiles)
.map(function(moduleName) {
// loads all spec files via their global module names (e.g.
// 'base/src/vg-player/vg-player.spec')
return System.import(moduleName);
});
}
更新
有一个例子库与错误here。您可以看到导致错误here的具体更改。运行$ npm install和$ npm test以获取错误。
从测试时，我面临着类似的问题浏览器。路径似乎是这里的问题。有关此问题的任何更新或解决了您的问题？ – Gary
尚未解决。考虑开设赏金。我需要解决这个问题。 – weltschmerz
你可以上传[mcve]（http://stackoverflow.com/help/mcve）作为git回购吗？ –