feat(ivy): implement TestBed (#25369)

PR Close #25369

packages/compiler/src/lifecycle_reflector.ts

@@ -52,5 +52,12 @@ function getHookName(hook: LifecycleHooks): string {
       return 'ngAfterViewInit';
     case LifecycleHooks.AfterViewChecked:
       return 'ngAfterViewChecked';
+    default:
+      // This default case is not needed by TypeScript compiler, as the switch is exhaustive.
+      // However Closure Compiler does not understand that and reports an error in typed mode.
+      // The `throw new Error` below works around the problem, and the unexpected: never variable
+      // makes sure tsc still checks this code is unreachable.
+      const unexpected: never = hook;
+      throw new Error(`unexpected ${unexpected}`);
   }
 }