karma-test-shim.js

Error.stackTraceLimit = 0;
jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000;

// (1)
var builtPaths = (__karma__.config.builtPaths || ['test/'])
    .map(function (p) { return '/base/' + p; });

// (2)
__karma__.loaded = function () { };

// (3)
function isJsFile(path) {
    return path.slice(-3) == '.js';
}

// (4)
function isSpecFile(path) {
    return /\.spec\.(.*\.)?js$/.test(path);
}

// (5)
function isBuiltFile(path) {
    return isJsFile(path) &&
        builtPaths.reduce(function (keep, bp) {
            return keep || (path.substr(0, bp.length) === bp);
        }, false);
}

// (6)
var allSpecFiles = Object.keys(window.__karma__.files)
    .filter(isSpecFile)
    .filter(isBuiltFile);

// (7)
System.config({
    baseURL: 'base',

    map: {
        '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
        '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
        '@angular/forms/testing': 'npm:@angular/forms/bundles/forms-testing.umd.js',
        '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
        '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
        '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
    },
});

// (8)
System.import('systemjs.config.js')
    .then(initTestBed)
    .then(initTesting);

function initTestBed() {
    return Promise.all([
        System.import('@angular/core/testing'),
        System.import('@angular/platform-browser-dynamic/testing')
    ])

        .then(function (providers) {
            var coreTesting = providers[0];
            var browserTesting = providers[1];

            coreTesting.TestBed.initTestEnvironment(
                browserTesting.BrowserDynamicTestingModule,
                browserTesting.platformBrowserDynamicTesting());
        })
}

// (9)
function initTesting() {
    return Promise.all(
        allSpecFiles.map(function (moduleName) {
            return System.import(moduleName);
        })
    )
        .then(__karma__.start, __karma__.error);
}