test(ivy): turn on passing test in platform-browser (#28604)

The behavior tested here was fixed by #28537, but I missed updating
the test in the original PR. This commit turns on the test to run
in Ivy mode, using "onlyInIvy" because the timing of the error message
is slightly different and requires CD to run.

PR Close #28604

packages/platform-browser/test/testing_public_spec.ts

@@ -10,7 +10,7 @@ import {CompilerConfig, ResourceLoader} from '@angular/compiler';
 import {CUSTOM_ELEMENTS_SCHEMA, Compiler, Component, Directive, Inject, Injectable, Injector, Input, NgModule, Optional, Pipe, SkipSelf, ɵstringify as stringify} from '@angular/core';
 import {TestBed, async, fakeAsync, getTestBed, inject, tick, withModule} from '@angular/core/testing';
 import {expect} from '@angular/platform-browser/testing/src/matchers';
-import {fixmeIvy, ivyEnabled, obsoleteInIvy} from '@angular/private/testing';
+import {ivyEnabled, modifiedInIvy, obsoleteInIvy, onlyInIvy} from '@angular/private/testing';
 
 // Services, and components for the tests.
 
@@ -919,7 +919,7 @@ Did you run and wait for 'resolveComponentResources()'?` :
       });
 
 
-      fixmeIvy(`FW-721: Bindings to unknown properties are not reported as errors`)
+      modifiedInIvy(`Unknown property error thrown during update mode, not creation mode`)
           .it('should error on unknown bound properties on custom elements by default', () => {
             @Component({template: '<some-element [someUnknownProp]="true"></some-element>'})
             class ComponentUsingInvalidProperty {
@@ -937,6 +937,28 @@ Did you run and wait for 'resolveComponentResources()'?` :
 
             restoreJasmineIt();
           });
+
+      onlyInIvy(`Unknown property error thrown during update mode, not creation mode`)
+          .it('should error on unknown bound properties on custom elements by default', () => {
+            @Component({template: '<some-element [someUnknownProp]="true"></some-element>'})
+            class ComponentUsingInvalidProperty {
+            }
+
+            const itPromise = patchJasmineIt();
+
+            expect(
+                () => it(
+                    'should fail', withModule(
+                                       {declarations: [ComponentUsingInvalidProperty]},
+                                       () => {
+                                         const fixture =
+                                             TestBed.createComponent(ComponentUsingInvalidProperty);
+                                         fixture.detectChanges();
+                                       })))
+                .toThrowError(/Can't bind to 'someUnknownProp'/);
+
+            restoreJasmineIt();
+          });
     });
 
     describe('creating components', () => {