diff --git a/packages/platform-browser/test/testing_public_spec.ts b/packages/platform-browser/test/testing_public_spec.ts
index 8df3b9ba17..ae85c71ecf 100644
--- a/packages/platform-browser/test/testing_public_spec.ts
+++ b/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', () => {