我正在使用Karma和Jasmine为Angular 4应用程序编写测试。我一直都会遇到这样的错误：
Error: Fetch error: 404 Not Found
at http://localhost:9876/base/node_modules/systemjs/dist/system.src.js?bf790cd9754a0743ba99db88ebac7a7c840dafaa:1500:13
at ZoneDelegate.invoke (http://localhost:9876/base/node_modules/zone.js/dist/zone.js?082dc1d83c7a42ddda9b652319d281eef1d450d5:391:26)
at Zone.run (http://localhost:9876/base/node_modules/zone.js/dist/zone.js?082dc1d83c7a42ddda9b652319d281eef1d450d5:141:43)
at http://localhost:9876/base/node_modules/zone.js/dist/zone.js?082dc1d83c7a42ddda9b652319d281eef1d450d5:818:57
at ZoneDelegate.invokeTask (http://localhost:9876/base/node_modules/zone.js/dist/zone.js?082dc1d83c7a42ddda9b652319d281eef1d450d5:424:31)
at Zone.runTask (http://localhost:9876/base/node_modules/zone.js/dist/zone.js?082dc1d83c7a42ddda9b652319d281eef1d450d5:191:47)
at drainMicroTaskQueue (http://localhost:9876/base/node_modules/zone.js/dist/zone.js?082dc1d83c7a42ddda9b652319d281eef1d450d5:584:35)
at <anonymous>'
我已经看过我试图包含的库/模块，它们似乎都使用XMLHTTPRequest()（或它的抽象）。其中包括mockBackend和karma-read-json。
我的karma.conf.js文件位于以下位置：
// Karma configuration
// Used for Angular app unit testing
'use strict';
var argv = require('yargs').argv;
var minimatch = require("minimatch");
module.exports = function (config) {
config.set({
// base path that will be used to resolve all patterns (eg. files, exclude)
basePath: './',
// frameworks to use
// available frameworks: https://npmjs.org/browse/keyword/karma-adapter
frameworks: ['jasmine'],
// list of files / patterns to load in the browser
files: [
// Polyfills.
'node_modules/core-js/client/shim.min.js',
'node_modules/intl/dist/Intl.min.js',
'node_modules/traceur/bin/traceur.js',
// System.js for module loading
'node_modules/systemjs/dist/system.src.js',
// Zone.js dependencies
'node_modules/zone.js/dist/zone.js',
'node_modules/zone.js/dist/long-stack-trace-zone.js',
'node_modules/zone.js/dist/async-test.js',
'node_modules/zone.js/dist/fake-async-test.js',
'node_modules/zone.js/dist/sync-test.js',
'node_modules/zone.js/dist/proxy.js',
'node_modules/zone.js/dist/jasmine-patch.js',
// karma-read-json
{ pattern: 'node_modules/karma-read-json/karma-read-json.js', included: false },
// RxJs.
{ pattern: 'node_modules/rxjs/**/*.js', included: false, watched: false },
{ pattern: 'node_modules/rxjs/**/*.js.map', included: false, watched: false },
// paths loaded via module imports
// Angular itself
{ pattern: 'node_modules/@angular/**/*.js', included: false, watched: true },
{ pattern: 'node_modules/@angular/**/*.js.map', included: false, watched: false },
{ pattern: 'dist/client/dev/**/*.js', included: false, watched: true },
{ pattern: 'dist/client/dev/**/*.html', included: false, watched: true, served: true },
{ pattern: 'dist/client/dev/**/*.css', included: false, watched: true, served: true },
{ pattern: 'node_modules/systemjs/dist/system-polyfills.js', included: false, watched: false }, // PhantomJS2 (and possibly others) might require it
// Dependencies for translation
{ pattern: 'node_modules/@ngx-translate/core/bundles/*.js', included:false, watched: false },
{ pattern: 'node_modules/@ngx-translate/http-loader/bundles/*.js', included:false, watched: false },
// Other libraries
{ pattern: 'node_modules/lodash/*.js', included:false, watched: false },
{ pattern: 'node_modules/cron-converter/*.js', included:false, watched: false },
{ pattern: 'node_modules/cron-converter/src/*.js', included:false, watched: false },
{ pattern: 'node_modules/sprintf-js/src/*.js', included:false, watched: false },
{ pattern: 'node_modules/moment-timezone/*.js', included:false, watched: false },
{ pattern: 'node_modules/moment/*.js', included:false, watched: false },
// suppress annoying 404 warnings for resources, images, etc.
{ pattern: 'dist/dev/assets/**/*', watched: false, included: false, served: true },
// i18n files to be included for translate to work
{ pattern: 'src/client/assets/i18n/*.json', included: false},
'test-config.js',
'dist/client/dev/app/system-config.js',
'test-main.js'
],
// must go along with above, suppress annoying 404 warnings.
proxies: {
'/assets/': '/base/dist/dev/assets/'
},
// list of files to exclude
exclude: [
'node_modules/**/*spec.js'
],
systemjs: {
serveFiles: [
'node_modules/**/*.js',
'src/client/app/**/*.js',
'src/client/assets/i18n/*.json'
]
},
// preprocess matching files before serving them to the browser
// available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
// test results reporter to use
// possible values: 'dots', 'progress'
// available reporters: https://npmjs.org/browse/keyword/karma-reporter
reporters: ['mocha'],
// web server port
port: 9876,
// enable / disable colors in the output (reporters and logs)
colors: true,
// level of logging
// possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
logLevel: config.LOG_INFO,
// enable / disable watching file and executing tests whenever any file changes
autoWatch: true,
// start these browsers
// available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
browsers: [
'Chrome'
],
customLaunchers: {
Chrome_travis_ci: {
base: 'Chrome',
flags: ['--no-sandbox']
}
},
// Continuous Integration mode
// if true, Karma captures browsers, runs the tests and exits
singleRun: false,
// Passing command line arguments to tests
client: {
files: argv.files ? minimatch.makeRe(argv.files).source : null
}
});
if (process.env.APPVEYOR) {
config.browsers = ['IE'];
config.singleRun = true;
config.browserNoActivityTimeout = 90000; // Note: default value (10000) is not enough
}
if (process.env.TRAVIS || process.env.CIRCLECI) {
config.browsers = ['Chrome_travis_ci'];
config.singleRun = true;
config.browserNoActivityTimeout = 90000;
}
};
我正在处理的应用程序也使用SystemJS进行捆绑，如有必要，我可以提供配置。
是否有可以包含的polyfill或者其他东西可以让Karma使用XMLHTTPRequest？
答案 0 :(得分：-1)
我遇到了同样的问题，我发现，在将另一个分支合并到我正在处理的分支之后，一些文件已经改变了位置，并且业力在旧路径中寻找它们。我只需要重新启动业力任务（在我的情况下也重新启动IDE）问题就解决了。希望能帮助到你！ ;-P