feat: implement global loading state with interceptor and component

src/app/shared/components/global-loading/global-loading.component.spec.ts

@@ -0,0 +1,54 @@
+import '@angular/compiler';
+import { signal } from '@angular/core';
+import { TestBed } from '@angular/core/testing';
+import { afterEach, describe, expect, it } from 'vitest';
+
+import { GlobalLoadingService } from '../../../core/services/global-loading/global-loading.service';
+import { GlobalLoadingComponent } from './global-loading.component';
+
+describe('GlobalLoadingComponent', () => {
+  afterEach(() => {
+    TestBed.resetTestingModule();
+  });
+
+  it('renders an accessible overlay while the app is loading', async () => {
+    const loadingState = signal(true);
+
+    await TestBed.configureTestingModule({
+      imports: [GlobalLoadingComponent],
+      providers: [
+        {
+          provide: GlobalLoadingService,
+          useValue: { isLoading: loadingState.asReadonly() }
+        }
+      ]
+    }).compileComponents();
+
+    const fixture = TestBed.createComponent(GlobalLoadingComponent);
+    fixture.detectChanges();
+
+    const overlay = fixture.nativeElement.querySelector('.global-loading');
+    expect(overlay).not.toBeNull();
+    expect(overlay.getAttribute('role')).toBe('status');
+    expect(overlay.getAttribute('aria-label')).toBe('Cargando');
+  });
+
+  it('does not render the overlay while the app is idle', async () => {
+    const loadingState = signal(false);
+
+    await TestBed.configureTestingModule({
+      imports: [GlobalLoadingComponent],
+      providers: [
+        {
+          provide: GlobalLoadingService,
+          useValue: { isLoading: loadingState.asReadonly() }
+        }
+      ]
+    }).compileComponents();
+
+    const fixture = TestBed.createComponent(GlobalLoadingComponent);
+    fixture.detectChanges();
+
+    expect(fixture.nativeElement.querySelector('.global-loading')).toBeNull();
+  });
+});