feat(challenge23): test harnesses

apps/testing-harness/src/app/app.component.ts

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+import { Component } from '@angular/core';
+import { ChildComponent } from './child.component';
+
+@Component({
+  standalone: true,
+  imports: [ChildComponent],
+  selector: 'app-root',
+  template: `<app-child />`,
+  styles: [''],
+})
+export class AppComponent {}

apps/testing-harness/src/app/app.config.ts

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+import { ApplicationConfig } from '@angular/core';
+import { provideAnimations } from '@angular/platform-browser/animations';
+
+export const appConfig: ApplicationConfig = {
+  providers: [provideAnimations()],
+};

apps/testing-harness/src/app/child.component.spec.ts

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+import { render } from '@testing-library/angular';
+import { ChildComponent } from './child.component';
+
+describe('ChildComponent', () => {
+  test('should have 1 slider, 3 checkboxes, 4 inputs, 2 buttons', async () => {
+    await render(ChildComponent);
+  });
+
+  test('should get initial value of slider thumb', async () => {
+    await render(ChildComponent);
+  });
+
+  test('set maxValue to 109 and slider max value should be 109', async () => {
+    await render(ChildComponent);
+  });
+
+  test('toggle disabled checkbox and slider should be disabled', async () => {
+    await render(ChildComponent);
+  });
+
+  test('set step value to 5 and click to forward button two times, thumb value should be 10', async () => {
+    await render(ChildComponent);
+  });
+
+  test('slider value is 5, set step value to 6, click on back button, slider value should still be 5', async () => {
+    await render(ChildComponent);
+  });
+});

apps/testing-harness/src/app/child.component.ts

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+import { Component } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { MatCardModule } from '@angular/material/card';
+import { MatCheckboxModule } from '@angular/material/checkbox';
+import { MatFormFieldModule } from '@angular/material/form-field';
+import { MatIconModule } from '@angular/material/icon';
+import { MatInputModule } from '@angular/material/input';
+import { MatSliderModule } from '@angular/material/slider';
+
+@Component({
+  selector: 'app-child',
+  template: `
+    <mat-card>
+      <mat-card-content>
+        <h2 class="my-3">Slider configuration</h2>
+
+        <section class="flex items-center">
+          <mat-form-field class="m-4 max-w-[180px] w-full">
+            <mat-label>Value</mat-label>
+            <input
+              matInput
+              type="number"
+              [(ngModel)]="value"
+              id="input-value" />
+          </mat-form-field>
+          <mat-form-field class="m-4 max-w-[180px] w-full">
+            <mat-label>Min value</mat-label>
+            <input matInput type="number" [(ngModel)]="min" id="input-min" />
+          </mat-form-field>
+          <mat-form-field class="m-4 max-w-[180px] w-full">
+            <mat-label>Max value</mat-label>
+            <input matInput type="number" [(ngModel)]="max" id="input-max" />
+          </mat-form-field>
+          <mat-form-field class="m-4 max-w-[180px] w-full">
+            <mat-label>Step size</mat-label>
+            <input matInput type="number" [(ngModel)]="step" id="input-step" />
+          </mat-form-field>
+        </section>
+
+        <section class="flex items-center">
+          <mat-checkbox [(ngModel)]="showTicks">Show ticks</mat-checkbox>
+        </section>
+
+        <section class="flex items-center">
+          <mat-checkbox [(ngModel)]="thumbLabel">Show thumb label</mat-checkbox>
+        </section>
+
+        <section class="flex items-center">
+          <mat-checkbox [(ngModel)]="disabled">Disabled</mat-checkbox>
+        </section>
+      </mat-card-content>
+    </mat-card>
+
+    <mat-card class="flex">
+      <mat-card-content>
+        <div class="flex gap-10">
+          <button mat-mini-fab (click)="back()">
+            <mat-icon>arrow_back_ios</mat-icon>
+          </button>
+          <mat-slider
+            class="m-4"
+            [disabled]="disabled"
+            [max]="max"
+            [min]="min"
+            [step]="step"
+            [discrete]="thumbLabel"
+            [showTickMarks]="showTicks">
+            <input matSliderThumb [(ngModel)]="value" />
+          </mat-slider>
+          <button mat-mini-fab (click)="forward()">
+            <mat-icon>arrow_forward_ios</mat-icon>
+          </button>
+        </div>
+      </mat-card-content>
+    </mat-card>
+  `,
+  styles: [
+    `
+      .mat-mdc-slider {
+        max-width: 300px;
+        width: 100%;
+      }
+
+      .mat-mdc-card + .mat-mdc-card {
+        margin-top: 8px;
+      }
+    `,
+  ],
+  standalone: true,
+  imports: [
+    MatCardModule,
+    MatFormFieldModule,
+    MatInputModule,
+    FormsModule,
+    MatCheckboxModule,
+    MatSliderModule,
+    MatIconModule,
+  ],
+})
+export class ChildComponent {
+  disabled = false;
+  max = 100;
+  min = 0;
+  showTicks = false;
+  step = 1;
+  thumbLabel = false;
+  value = 0;
+
+  back() {
+    if (this.value - this.step >= this.min) {
+      this.value -= this.step;
+    }
+  }
+
+  forward() {
+    if (this.value + this.step <= this.max) {
+      this.value += this.step;
+    }
+  }
+}