test: update standalone browser tests to not pollute test output (#46510

)

There are a couple of tests intentionally triggering and verifying
runtime errors thrown by `bootstrapApplication`. These errors are
also printed using the default `ErrorHandler`, while also being
re-thrown and caught/asserted by the test.

The error logging should be disabled as otherwise three tests will
pollute the test output with large amounts of text that make it
also seem like actual failing tests / something incorrect going on with
the jasmine environment.

PR Close #46510

packages/platform-browser/test/browser/bootstrap_standalone_spec.ts

@@ -7,7 +7,7 @@
  */
 
 import {DOCUMENT, ɵgetDOM as getDOM} from '@angular/common';
-import {Component, destroyPlatform, Inject, Injectable, InjectionToken, NgModule} from '@angular/core';
+import {Component, destroyPlatform, ErrorHandler, Inject, Injectable, InjectionToken, NgModule} from '@angular/core';
 import {inject} from '@angular/core/testing';
 
 import {bootstrapApplication, BrowserModule} from '../../src/browser';
@@ -24,6 +24,13 @@ describe('bootstrapApplication for standalone components', () => {
     rootEl?.remove();
   });
 
+  class SilentErrorHandler extends ErrorHandler {
+    override handleError() {
+      // the error is already re-thrown by the application ref.
+      // we don't want to print it, but instead catch it in tests.
+    }
+  }
+
   it('should create injector where ambient providers shadow explicit providers', async () => {
     const testToken = new InjectionToken('test token');
 
@@ -96,7 +103,12 @@ describe('bootstrapApplication for standalone components', () => {
        try {
          await bootstrapApplication(
              StandaloneCmp,
-             {providers: [NeedsAmbientProvider]},
+             {
+               providers: [
+                 {provide: ErrorHandler, useClass: SilentErrorHandler},
+                 NeedsAmbientProvider,
+               ]
+             },
          );
 
          // we expect the bootstrap process to fail since the "NeedsAmbientProvider" service
@@ -121,7 +133,8 @@ describe('bootstrapApplication for standalone components', () => {
        }
 
        try {
-         await bootstrapApplication(StandaloneCmp);
+         await bootstrapApplication(
+             StandaloneCmp, {providers: [{provide: ErrorHandler, useClass: SilentErrorHandler}]});
 
          // The `bootstrapApplication` already includes the set of providers from the
          // `BrowserModule`, so including the `BrowserModule` again will bring duplicate providers
@@ -152,7 +165,8 @@ describe('bootstrapApplication for standalone components', () => {
        }
 
        try {
-         await bootstrapApplication(StandaloneCmp);
+         await bootstrapApplication(
+             StandaloneCmp, {providers: [{provide: ErrorHandler, useClass: SilentErrorHandler}]});
 
          // The `bootstrapApplication` already includes the set of providers from the
          // `BrowserModule`, so including the `BrowserModule` again will bring duplicate providers