fix(test): move all test apps

apps/testing/input-output/src/app/counter.component.ts

@@ -0,0 +1,45 @@
+import { AsyncPipe } from '@angular/common';
+import {
+  ChangeDetectionStrategy,
+  Component,
+  EventEmitter,
+  Input,
+  Output,
+} from '@angular/core';
+import { LetDirective } from '@ngrx/component';
+import { ComponentStore } from '@ngrx/component-store';
+
+@Component({
+  selector: 'app-counter',
+  standalone: true,
+  imports: [AsyncPipe, LetDirective],
+  template: `
+    <ng-container *ngrxLet="counter$ as counter">
+      <p data-testid="counter">Counter: {{ counter }}</p>
+      <button (click)="increment()">Increment</button>
+      <button (click)="decrement()">Decrement</button>
+      <button (click)="send.emit(counter)">Send</button>
+    </ng-container>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class CounterComponent extends ComponentStore<{ counter: number }> {
+  @Input() set initialValue(initialValue: number) {
+    this.patchState({ counter: initialValue });
+  }
+
+  @Output() send = new EventEmitter<number>();
+
+  readonly counter$ = this.select((state) => state.counter);
+
+  readonly increment = this.updater((state) => ({
+    counter: state.counter + 1,
+  }));
+  readonly decrement = this.updater((state) => ({
+    counter: state.counter - 1,
+  }));
+
+  constructor() {
+    super({ counter: 0 });
+  }
+}