test(tabs): add performance tests for mat-tabs

Author: wagnermaciel

test/benchmarks/material/tabs/BUILD.bazel

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+load("@npm_angular_dev_infra_private//benchmark/component_benchmark:component_benchmark.bzl", "component_benchmark")
+
+# TODO(wagnermaciel): Update this target to provide indigo-pink in a way that doesn't require having to import it with
+# stylesUrls inside the components once `component_benchmark` supports asset injection.
+
+component_benchmark(
+    name = "benchmark",
+    driver = ":tabs.perf-spec.ts",
+    driver_deps = [
+        "@npm//@angular/dev-infra-private",
+        "@npm//protractor",
+        "@npm//@types/jasmine",
+    ],
+    ng_deps = [
+        "@npm//@angular/core",
+        "@npm//@angular/platform-browser",
+        "//src/material/tabs",
+    ],
+    ng_srcs = [":app.module.ts"],
+    prefix = "",
+    styles = ["//src/material/prebuilt-themes:indigo-pink"],
+)

test/benchmarks/material/tabs/app.module.ts

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+/**
+ * @license
+ * Copyright Google LLC 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 {Component, NgModule, ViewEncapsulation} from '@angular/core';
+import {BrowserModule} from '@angular/platform-browser';
+import {BrowserAnimationsModule} from '@angular/platform-browser/animations';
+import {MatTabsModule} from '@angular/material/tabs';
+
+@Component({
+  selector: 'app-root',
+  template: `
+    <button id="show-small-tab-group" (click)="showSmallTabGroup()">Show Small Tab Group</button>
+    <button id="show-large-tab-group" (click)="showLargeTabGroup()">Show Large Tab Group</button>
+    <button id="hide" (click)="hide()">Hide</button>
+
+    <mat-tab-group *ngIf="isSmallTabGroupVisible">
+      <mat-tab label="First"> Content 1 </mat-tab>
+      <mat-tab label="Second"> Content 2 </mat-tab>
+      <mat-tab label="Third"> Content 3 </mat-tab>
+    </mat-tab-group>
+
+    <mat-tab-group *ngIf="isLargeTabGroupVisible">
+      <mat-tab label="First"> Content 1 </mat-tab>
+      <mat-tab label="Second"> Content 2 </mat-tab>
+      <mat-tab label="Third"> Content 3 </mat-tab>
+      <mat-tab label="Fourth"> Content 4 </mat-tab>
+      <mat-tab label="Fifth"> Content 5 </mat-tab>
+      <mat-tab label="Sixth"> Content 6 </mat-tab>
+      <mat-tab label="Seventh"> Content 7 </mat-tab>
+      <mat-tab label="Eigth"> Content 8 </mat-tab>
+      <mat-tab label="Ninth"> Content 9 </mat-tab>
+      <mat-tab label="Tenth"> Content 10 </mat-tab>
+    </mat-tab-group>
+  `,
+  encapsulation: ViewEncapsulation.None,
+  styleUrls: ['//src/material/core/theming/prebuilt/indigo-pink.css'],
+})
+export class TabsBenchmarkApp {
+  isSmallTabGroupVisible = false;
+  isLargeTabGroupVisible = false;
+
+  showSmallTabGroup() { this.isSmallTabGroupVisible = true; }
+  showLargeTabGroup() { this.isLargeTabGroupVisible = true; }
+
+  hide() {
+    this.isSmallTabGroupVisible = false;
+    this.isLargeTabGroupVisible = false;
+  }
+}
+
+
+@NgModule({
+  declarations: [TabsBenchmarkApp],
+  imports: [
+    BrowserModule,
+    BrowserAnimationsModule,
+    MatTabsModule,
+  ],
+  providers: [],
+  bootstrap: [TabsBenchmarkApp],
+})
+export class AppModule {}

test/benchmarks/material/tabs/tabs.perf-spec.ts

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+/**
+ * @license
+ * Copyright Google LLC 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 {$, $$, browser, ElementArrayFinder} from 'protractor';
+import {runBenchmark} from '@angular/dev-infra-private/benchmark/driver-utilities';
+
+describe('tabs performance benchmarks', () => {
+  beforeAll(() => {
+    browser.rootEl = '#root';
+  });
+
+  it('renders a small tab group', async() => {
+    await runBenchmark({
+      id: 'small-tab-group-render',
+      url: '',
+      ignoreBrowserSynchronization: true,
+      params: [],
+      prepare: async () => await $('#hide').click(),
+      work: async () => await $('#show-small-tab-group').click(),
+    });
+  });
+
+  it('renders a large tab group', async() => {
+    await runBenchmark({
+      id: 'large-tab-group-render',
+      url: '',
+      ignoreBrowserSynchronization: true,
+      params: [],
+      prepare: async () => await $('#hide').click(),
+      work: async () => await $('#show-large-tab-group').click(),
+    });
+  });
+
+  it('switches between tabs', async() => {
+    let tabs: any[];
+    let tabToClick = 0;
+    await runBenchmark({
+      id: 'tab-switching',
+      url: '',
+      ignoreBrowserSynchronization: true,
+      params: [],
+      setup: async () => {
+        await $('#show-small-tab-group').click();
+        tabs = await $$('.mat-tab-label');
+      },
+      prepare: async () => {
+        tabToClick = tabToClick < tabs.length - 1 ? tabToClick + 1 : 0;
+      },
+      work: async () => await tabs[tabToClick].click(),
+    });
+  });
+});