I'm building a web app using Angular 2, SystemJS, and Karma for tests.
I'm trying to load the node module ngrx/store in a test:
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...
});
});
However, my tests fail with the following message:
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
I actually had the same problem in dev as well, and it turns out SystemJS did not know where to find @ngrx/store. To solve this, I did this:
System.config({
packages: {
src: {
format: 'register',
defaultExtension: 'js'
}
},
map: { '@ngrx/store' : 'node_modules/@ngrx/store/dist/store.js' } // <-- this
});
I modified my Karma shim file to do the same. Upon the running the tests a second time, I now get a different error:
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
This means it must be taking the explicit path I gave it into account, but it still cannot find the module. It is the correct path to the module, however, and works when loaded in a browser.
I'm pretty lost on what to do next. Can someone point me in the right direction?
A few things to note:
- Adding the node module to Karma's
filesarray is not an option, since its dependencies need to be resolved with SystemJS - This only happens with node modules for which SystemJS needs custom instructions on where they are located. I can load other modules just fine in my tests without providing a specific location as long SystemJS is able to find it
Here is my Karma configuration:
// 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
})
};
And here is my Karma shim:
// 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);
});
}
Update
There is an example repository with the error here. You can see the specific changes that cause the error here. Run $ npm install and $ npm test to get the error.
