build: move zone.js to angular repo (#30962)

PR Close #30962

packages/zone.js/lib/testing/async-testing.ts

@@ -0,0 +1,99 @@
+/**
+ * @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-spec/async-test';
+
+Zone.__load_patch('asynctest', (global: any, Zone: ZoneType, api: _ZonePrivate) => {
+  /**
+   * Wraps a test function in an asynchronous test zone. The test will automatically
+   * complete when all asynchronous calls within this zone are done.
+   */
+  (Zone as any)[api.symbol('asyncTest')] = function asyncTest(fn: Function): (done: any) => any {
+    // If we're running using the Jasmine test framework, adapt to call the 'done'
+    // function when asynchronous activity is finished.
+    if (global.jasmine) {
+      // Not using an arrow function to preserve context passed from call site
+      return function(done: any) {
+        if (!done) {
+          // if we run beforeEach in @angular/core/testing/testing_internal then we get no done
+          // fake it here and assume sync.
+          done = function() {};
+          done.fail = function(e: any) { throw e; };
+        }
+        runInTestZone(fn, this, done, (err: any) => {
+          if (typeof err === 'string') {
+            return done.fail(new Error(<string>err));
+          } else {
+            done.fail(err);
+          }
+        });
+      };
+    }
+    // Otherwise, return a promise which will resolve when asynchronous activity
+    // is finished. This will be correctly consumed by the Mocha framework with
+    // it('...', async(myFn)); or can be used in a custom framework.
+    // Not using an arrow function to preserve context passed from call site
+    return function() {
+      return new Promise<void>((finishCallback, failCallback) => {
+        runInTestZone(fn, this, finishCallback, failCallback);
+      });
+    };
+  };
+
+  function runInTestZone(
+      fn: Function, context: any, finishCallback: Function, failCallback: Function) {
+    const currentZone = Zone.current;
+    const AsyncTestZoneSpec = (Zone as any)['AsyncTestZoneSpec'];
+    if (AsyncTestZoneSpec === undefined) {
+      throw new Error(
+          'AsyncTestZoneSpec is needed for the async() test helper but could not be found. ' +
+          'Please make sure that your environment includes zone.js/dist/async-test.js');
+    }
+    const ProxyZoneSpec = (Zone as any)['ProxyZoneSpec'] as {
+      get(): {setDelegate(spec: ZoneSpec): void; getDelegate(): ZoneSpec;};
+      assertPresent: () => void;
+    };
+    if (ProxyZoneSpec === undefined) {
+      throw new Error(
+          'ProxyZoneSpec is needed for the async() test helper but could not be found. ' +
+          'Please make sure that your environment includes zone.js/dist/proxy.js');
+    }
+    const proxyZoneSpec = ProxyZoneSpec.get();
+    ProxyZoneSpec.assertPresent();
+    // We need to create the AsyncTestZoneSpec outside the ProxyZone.
+    // If we do it in ProxyZone then we will get to infinite recursion.
+    const proxyZone = Zone.current.getZoneWith('ProxyZoneSpec');
+    const previousDelegate = proxyZoneSpec.getDelegate();
+    proxyZone !.parent !.run(() => {
+      const testZoneSpec: ZoneSpec = new AsyncTestZoneSpec(
+          () => {
+            // Need to restore the original zone.
+            if (proxyZoneSpec.getDelegate() == testZoneSpec) {
+              // Only reset the zone spec if it's
+              // sill this one. Otherwise, assume
+              // it's OK.
+              proxyZoneSpec.setDelegate(previousDelegate);
+            }
+            (testZoneSpec as any).unPatchPromiseForTest();
+            currentZone.run(() => { finishCallback(); });
+          },
+          (error: any) => {
+            // Need to restore the original zone.
+            if (proxyZoneSpec.getDelegate() == testZoneSpec) {
+              // Only reset the zone spec if it's sill this one. Otherwise, assume it's OK.
+              proxyZoneSpec.setDelegate(previousDelegate);
+            }
+            (testZoneSpec as any).unPatchPromiseForTest();
+            currentZone.run(() => { failCallback(error); });
+          },
+          'test');
+      proxyZoneSpec.setDelegate(testZoneSpec);
+      (testZoneSpec as any).patchPromiseForTest();
+    });
+    return Zone.current.runGuarded(fn, context);
+  }
+});