test(angular): add navigation tests (#16494)

angular/test/test-app/src/app/modal-example/modal-example.component.ts

@@ -0,0 +1,41 @@
+import { Component, Input, NgZone } from '@angular/core';
+import { ModalController } from '@ionic/angular';
+
+@Component({
+  selector: 'app-modal-example',
+  templateUrl: './modal-example.component.html',
+})
+export class ModalExampleComponent {
+
+  @Input() value: string;
+
+  willEnter = 0;
+  didEnter = 0;
+  willLeave = 0;
+  didLeave = 0;
+
+  constructor(
+    private modalCtrl: ModalController
+  ) {}
+
+  ionViewWillEnter() {
+    NgZone.assertInAngularZone();
+    this.willEnter++;
+  }
+  ionViewDidEnter() {
+    NgZone.assertInAngularZone();
+    this.didEnter++;
+  }
+  ionViewWillLeave() {
+    NgZone.assertInAngularZone();
+    this.willLeave++;
+  }
+  ionViewDidLeave() {
+    NgZone.assertInAngularZone();
+    this.didLeave++;
+  }
+
+  closeModal() {
+    this.modalCtrl.dismiss();
+  }
+}