build: move _testing_init into tools; limit web_test concurrency (#21053)

PR Close #21053

tools/testing/init_node_spec.ts

@@ -0,0 +1,44 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import 'zone.js/dist/zone-node.js';
+import 'zone.js/dist/long-stack-trace-zone.js';
+import 'zone.js/dist/proxy.js';
+import 'zone.js/dist/sync-test.js';
+import 'zone.js/dist/async-test.js';
+import 'zone.js/dist/fake-async-test.js';
+import 'reflect-metadata/Reflect';
+
+// This hack is needed to get jasmine, node and zone working inside bazel.
+// 1) we load `jasmine-core` which contains the ENV: it, describe etc...
+const jasmineCore: any = require('jasmine-core');
+// 2) We create an instance of `jasmine` ENV.
+const patchedJasmine = jasmineCore.boot(jasmineCore);
+// 3) Save the `jasmine` into global so that `zone.js/dist/jasmine-patch.js` can get a hold of it to
+// patch it.
+(global as any)['jasmine'] = patchedJasmine;
+// 4) Change the `jasmine-core` to make sure that all subsequent jasmine's have the same ENV,
+// otherwise the patch will not work.
+//    This is needed since Bazel creates a new instance of jasmine and it's ENV and we want to make
+//    sure it gets the same one.
+jasmineCore.boot = function() {
+  return patchedJasmine;
+};
+// 5) Patch jasmine ENV with code which understands ProxyZone.
+import 'zone.js/dist/jasmine-patch.js';
+
+(global as any).isNode = true;
+(global as any).isBrowser = false;
+
+// Init TestBed
+import {TestBed} from '@angular/core/testing';
+import {ServerTestingModule, platformServerTesting} from '@angular/platform-server/testing/src/server';
+import {DominoAdapter} from '@angular/platform-server/src/domino_adapter';
+
+TestBed.initTestEnvironment(ServerTestingModule, platformServerTesting());
+DominoAdapter.makeCurrent();