test(core): Add benchmark for transplanted views when insertion is dirty (#36722)

The current benchmark for transplanted views only exercises the path
when the declaration location is dirty and the insertion is not. This
test adds a benchmark for when both insertion and declaration are dirty.

PR Close #36722

modules/benchmarks/src/change_detection/change_detection.e2e-spec.ts

@@ -23,8 +23,14 @@ describe('change detection benchmark', () => {
     expect(await $('#root').getText()).toEqual('');
     await $('#createDom').click();
     expect($('#root').getText()).toContain('1');
+
+    await $('#markInsertionComponentForCheck').click();
     await $('#detectChanges').click();
-    expect($('#root').getText()).toContain('2');
+    // Ivy currently refreshes at *both* declaration and insertion while VE only refreshes at
+    // insertion. Simply assert that the view was updated at least once since the first update.
+    expect(Number(await $('#root').getText())).toBeGreaterThan(1);
+
+    // The button click causes change detection to trigger at the root
     await $('#destroyDom').click();
     expect(await $('#root').getText()).toEqual('');
   });

modules/benchmarks/src/change_detection/change_detection.perf-spec.ts

@@ -15,8 +15,9 @@ interface Worker {
   work(): void;
 }
 
-const UpdateWorker: Worker = {
+// Used to benchmark performance when insertion tree is not dirty.
-  id: 'createOnly',
+const InsertionNotDirtyWorker: Worker = {
+  id: 'insertionNotDirty',
   prepare: () => {
     $('#destroyDom').click();
     $('#createDom').click();
@@ -24,6 +25,17 @@ const UpdateWorker: Worker = {
   work: () => $('#detectChanges').click()
 };
 
+// Used to benchmark performance when both declaration and insertion trees are dirty.
+const AllComponentsDirtyWorker: Worker = {
+  id: 'allComponentsDirty',
+  prepare: () => {
+    $('#destroyDom').click();
+    $('#createDom').click();
+    $('#markInsertionComponentForCheck').click();
+  },
+  work: () => $('#detectChanges').click()
+};
+
 
 // In order to make sure that we don't change the ids of the benchmarks, we need to
 // determine the current test package name from the Bazel target. This is necessary
@@ -36,7 +48,7 @@ const testPackageName = process.env['BAZEL_TARGET']!.split(':')[0].split('/').po
 describe('change detection benchmark perf', () => {
   afterEach(verifyNoBrowserErrors);
 
-  [UpdateWorker].forEach((worker) => {
+  [InsertionNotDirtyWorker, AllComponentsDirtyWorker].forEach((worker) => {
     describe(worker.id, () => {
       it(`should run benchmark for ${testPackageName}`, async () => {
         await runChangeDetectionBenchmark({

modules/benchmarks/src/change_detection/transplanted_views/index.html

@@ -18,6 +18,7 @@
   <p>
     <button id="destroyDom">destroyDom</button>
     <button id="createDom">createDom</button>
+    <button id="markInsertionComponentForCheck">markInsertionComponentForCheck</button>
     <button id="detectChanges">detectChanges</button>
     <button id="detectChangesProfile">profile detectChanges</button>
   </p>

modules/benchmarks/src/change_detection/transplanted_views/init.ts

@@ -19,6 +19,7 @@ export function init(moduleRef: NgModuleRef<TransplantedViewsModule>) {
 
   bindAction('#destroyDom', destroyDom);
   bindAction('#createDom', createDom);
+  bindAction('#markInsertionComponentForCheck', markInsertionComponentForCheck);
   bindAction('#detectChanges', detectChanges);
   bindAction('#detectChangesProfile', profile(detectChanges, noop, 'detectChanges'));
 
@@ -35,6 +36,10 @@ export function init(moduleRef: NgModuleRef<TransplantedViewsModule>) {
     appRef.tick();
   }
 
+  function markInsertionComponentForCheck() {
+    declaration.insertionComponent.changeDetector.markForCheck();
+  }
+
   function detectChanges() {
     appRef.tick();
   }

modules/benchmarks/src/change_detection/transplanted_views/transplanted_views.ts

@@ -6,29 +6,11 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ChangeDetectionStrategy, Component, Input, NgModule, TemplateRef} from '@angular/core';
+import {ChangeDetectionStrategy, ChangeDetectorRef, Component, Input, NgModule, TemplateRef, ViewChild} from '@angular/core';
 import {BrowserModule} from '@angular/platform-browser';
 
 import {newArray} from '../util';
 
-@Component({
-  selector: 'declaration-component',
-  template: `
-  <ng-template #template>{{trackTemplateRefresh()}}</ng-template>
-  <insertion-component [template]="template" [viewCount]="viewCount"></insertion-component>
-  `,
-})
-export class DeclarationComponent {
-  @Input() viewCount = 1;
-  // Tracks number of times the template was executed to ensure it was updated during CD.
-  templateRefreshCount = 0;
-
-  trackTemplateRefresh() {
-    this.templateRefreshCount++;
-    return this.templateRefreshCount;
-  }
-}
-
 @Component({
   selector: 'insertion-component',
   template: `
@@ -44,12 +26,33 @@ export class InsertionComponent {
     this.views = n > 0 ? newArray<any>(n) : [];
   }
 
+  constructor(readonly changeDetector: ChangeDetectorRef) {}
+
   // use trackBy to ensure profile isn't affected by the cost to refresh ngFor.
   trackByIndex(index: number, item: any) {
     return index;
   }
 }
 
+@Component({
+  selector: 'declaration-component',
+  template: `
+  <ng-template #template>{{trackTemplateRefresh()}}</ng-template>
+  <insertion-component [template]="template" [viewCount]="viewCount"></insertion-component>
+  `,
+})
+export class DeclarationComponent {
+  @Input() viewCount = 1;
+  @ViewChild(InsertionComponent) insertionComponent!: InsertionComponent;
+  // Tracks number of times the template was executed to ensure it was updated during CD.
+  templateRefreshCount = 0;
+
+  trackTemplateRefresh() {
+    this.templateRefreshCount++;
+    return this.templateRefreshCount;
+  }
+}
+
 @NgModule({
   declarations: [DeclarationComponent, InsertionComponent],
   bootstrap: [DeclarationComponent],