test(core): Add benchpress test for transplanted view change detection

modules/benchmarks/src/change_detection/BUILD.bazel

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+load("//tools:defaults.bzl", "ts_library")
+
+package(default_visibility = ["//visibility:public"])
+
+ts_library(
+    name = "util_lib",
+    srcs = ["util.ts"],
+    tsconfig = "//modules/benchmarks:tsconfig-e2e.json",
+    deps = ["//modules/benchmarks/src:util_lib"],
+)
+
+ts_library(
+    name = "perf_tests_lib",
+    testonly = 1,
+    srcs = ["change_detection.perf-spec.ts"],
+    tsconfig = "//modules/benchmarks:tsconfig-e2e.json",
+    deps = [
+        "//modules/e2e_util",
+        "@npm//protractor",
+    ],
+)
+
+ts_library(
+    name = "e2e_tests_lib",
+    testonly = 1,
+    srcs = ["change_detection.e2e-spec.ts"],
+    tsconfig = "//modules/benchmarks:tsconfig-e2e.json",
+    deps = [
+        "//modules/e2e_util",
+        "@npm//protractor",
+    ],
+)

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

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+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {$} from 'protractor';
+
+import {openBrowser, verifyNoBrowserErrors} from '../../../e2e_util/e2e_util';
+
+describe('change detection benchmark', () => {
+  afterEach(verifyNoBrowserErrors);
+
+  it(`should render and update`, async() => {
+    openBrowser({
+      url: '',
+      ignoreBrowserSynchronization: true,
+      params: [{name: 'viewCount', value: 1}],
+    });
+    expect($('#root').getText()).toContain('1');
+    await $('#detectChanges').click();
+    expect($('#root').getText()).toContain('2');
+    await $('#detectChanges').click();
+    expect($('#root').getText()).toContain('3');
+    await $('#destroyDom').click();
+    expect(await $('#root').getText()).toEqual('');
+  });
+});

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

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+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {$} from 'protractor';
+import {runBenchmark, verifyNoBrowserErrors} from '../../../e2e_util/perf_util';
+
+interface Worker {
+  id: string;
+  prepare?(): void;
+  work(): void;
+}
+
+const UpdateWorker: Worker = {
+  id: 'createOnly',
+  prepare: () => {
+    $('#destroyDom').click();
+    $('#createDom').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
+// because previous to the Bazel conversion, the benchmark test ids contained the test
+// name. We determine the name of the Bazel package where this test runs from the current test
+// target. The Bazel target
+// looks like: "//modules/benchmarks/src/change_detection/{pkg_name}:{target_name}".
+const testPackageName = process.env['BAZEL_TARGET'] !.split(':')[0].split('/').pop();
+
+describe('change detection benchmark perf', () => {
+
+  afterEach(verifyNoBrowserErrors);
+
+  [UpdateWorker].forEach((worker) => {
+    describe(worker.id, () => {
+      it(`should run benchmark for ${testPackageName}`, async() => {
+        await runChangeDetectionBenchmark({
+          id: `change_detection.${testPackageName}.${worker.id}`,
+          url: '/',
+          ignoreBrowserSynchronization: true,
+          worker: worker
+        });
+      });
+    });
+  });
+});
+
+function runChangeDetectionBenchmark(
+    config: {id: string, url: string, ignoreBrowserSynchronization?: boolean, worker: Worker}) {
+  return runBenchmark({
+    id: config.id,
+    url: config.url,
+    ignoreBrowserSynchronization: config.ignoreBrowserSynchronization,
+    params: [{name: 'viewCount', value: 10}],
+    prepare: config.worker.prepare,
+    work: config.worker.work
+  });
+}

modules/benchmarks/src/change_detection/transplanted_views/BUILD.bazel

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+package(default_visibility = ["//visibility:public"])
+
+load("//tools:defaults.bzl", "ng_module", "ng_rollup_bundle", "ts_devserver")
+load("//modules/benchmarks:benchmark_test.bzl", "benchmark_test")
+load("//modules/benchmarks:e2e_test.bzl", "e2e_test")
+
+ng_module(
+    name = "transplanted_views_lib",
+    srcs = [
+        "index_aot.ts",
+        "transplanted_views.ts",
+    ],
+    tags = ["ivy-only"],
+    deps = [
+        "//modules/benchmarks/src:util_lib",
+        "//modules/benchmarks/src/change_detection:util_lib",
+        "//packages:types",
+        "//packages/common",
+        "//packages/core",
+    ],
+)
+
+ng_rollup_bundle(
+    name = "bundle",
+    entry_point = ":index_aot.ts",
+    tags = ["ivy-only"],
+    deps = [
+        ":transplanted_views_lib",
+        "@npm//rxjs",
+    ],
+)
+
+ts_devserver(
+    name = "devserver",
+    port = 4200,
+    static_files = ["index.html"],
+    tags = ["ivy-only"],
+    deps = [
+        ":bundle.min_debug.js",
+    ],
+)
+
+benchmark_test(
+    name = "perf",
+    server = ":devserver",
+    tags = ["ivy-only"],
+    deps = ["//modules/benchmarks/src/change_detection:perf_tests_lib"],
+)
+
+e2e_test(
+    name = "e2e",
+    server = ":devserver",
+    tags = ["ivy-only"],
+    deps = ["//modules/benchmarks/src/change_detection:e2e_tests_lib"],
+)

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

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+<!doctype html>
+<html>
+<head>
+  <!-- Prevent the browser from requesting any favicon. -->
+  <link rel="icon" href="data:,">
+</head>
+<body>
+
+  <h2>Params</h2>
+  <form>
+    View Count:
+    <input type="number" name="viewCount" placeholder="viewCount" value="10">
+    <br>
+    <button>Apply</button>
+  </form>
+
+  <h2>Render3 Transplanted View Benchmark</h2>
+  <p>
+    <button id="destroyDom">destroyDom</button>
+    <button id="createDom">createDom</button>
+    <button id="detectChanges">detectChanges</button>
+    <button id="detectChangesProfile">profile detectChanges</button>
+  </p>
+
+  <div>
+    <declaration-component id="root"></declaration-component>
+  </div>
+
+  <!--load location for ts_devserver-->
+  <script src="/app_bundle.js"></script>
+</body>
+</html>

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

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+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import {ɵrenderComponent as renderComponent} from '@angular/core';
+
+import {bindAction, profile} from '../../util';
+
+import {DeclarationComponent, createDom, destroyDom, detectChanges} from './transplanted_views';
+
+function noop() {}
+
+export function main() {
+  let component: DeclarationComponent;
+  if (typeof window !== 'undefined') {
+    component = renderComponent<DeclarationComponent>(DeclarationComponent);
+    bindAction('#destroyDom', () => destroyDom(component));
+    bindAction('#createDom', () => createDom(component));
+    bindAction('#detectChanges', () => detectChanges(component));
+    bindAction(
+        '#detectChangesProfile', profile(() => detectChanges(component), noop, 'detect_changes'));
+  }
+}
+
+main();

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

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+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {CommonModule} from '@angular/common';
+import {ChangeDetectionStrategy, Component, Input, NgModule, TemplateRef, ɵdetectChanges} from '@angular/core';
+import {newArray, numViews} 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: `
+    <ng-container *ngFor="let n of views; template: template; trackBy: trackByIndex"></ng-container>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush
+})
+export class InsertionComponent {
+  @Input() template !: TemplateRef<{}>;
+  views: any[] = [];
+  @Input()
+  set viewCount(n: number) { this.views = n > 0 ? newArray<any>(n) : []; }
+
+  // use trackBy to ensure profile isn't affected by the cost to refresh ngFor.
+  trackByIndex(index: number, item: any) { return index; }
+}
+
+@NgModule({declarations: [DeclarationComponent, InsertionComponent], imports: [CommonModule]})
+export class TransplantedViewModule {
+}
+
+export function destroyDom(component: DeclarationComponent) {
+  component.templateRefreshCount = 0;
+  component.viewCount = 0;
+  ɵdetectChanges(component);
+}
+
+export function createDom(component: DeclarationComponent) {
+  component.viewCount = numViews;
+  ɵdetectChanges(component);
+}
+
+export function detectChanges(component: DeclarationComponent) {
+  ɵdetectChanges(component);
+}

modules/benchmarks/src/change_detection/util.ts

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+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {getIntParameter} from '../util';
+
+export const numViews = getIntParameter('viewCount');
+
+export function newArray<T = any>(size: number): T[];
+export function newArray<T>(size: number, value: T): T[];
+export function newArray<T>(size: number, value?: T): T[] {
+  const list: T[] = [];
+  for (let i = 0; i < size; i++) {
+    list.push(value !);
+  }
+  return list;
+}