if-has-permission.directive.spec.ts

import { Component, signal } from '@angular/core';
import { ComponentFixture, TestBed } from '@angular/core/testing';
import { IfHasPermissionDirective } from './if-has-permission.directive';
import { Permission, PermissionsService } from '../permissions.service';

const $allowedPermissions = signal<Permission[]>([]);

class PermissionsServiceMock {
  hasPermission(permission: Permission) {
    return $allowedPermissions().includes(permission);
  }
}

@Component({
  selector: 'test-if-has-permission',
  standalone: true,
  imports: [IfHasPermissionDirective],
  template: `
    <ng-template #falseTemplate>
      <p>Does not have permission</p>
    </ng-template>

    <div *ifHasPermission="'READ'; else falseTemplate">
      <p>Content that requires read permission</p>
    </div>

    <div *ifHasPermission="'CREATE'; else falseTemplate">
      <p>Content that requires create permission</p>
    </div>

    <div *ifHasPermission="'DELETE'">
      <p>Content that requires delete permission</p>
    </div>
  `,
})
class TestComponent {
}

describe('IfHasPermissionDirective', () => {
  let component: TestComponent;
  let fixture: ComponentFixture<TestComponent>;

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      imports: [TestComponent],
      providers: [{
        provide: PermissionsService,
        useClass: PermissionsServiceMock,
      }],
    }).compileComponents();
  });

  beforeEach(() => {
    fixture = TestBed.createComponent(TestComponent);
    component = fixture.componentInstance;
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });

  it('should render content with all permissions', () => {
    $allowedPermissions.set(['READ', 'CREATE', 'DELETE']);
    fixture.detectChanges();
    expect(fixture.nativeElement.textContent).toContain('Content that requires read permission');
    expect(fixture.nativeElement.textContent).toContain('Content that requires create permission');
    expect(fixture.nativeElement.textContent).toContain('Content that requires delete permission');
    expect(fixture.nativeElement.textContent).not.toContain('Does not have permission');
  });

  it('should render content with read permission only', () => {
    $allowedPermissions.set(['READ']);
    fixture.detectChanges();
    expect(fixture.nativeElement.textContent).toContain('Content that requires read permission');
    expect(fixture.nativeElement.textContent).not.toContain('Content that requires create permission');
    expect(fixture.nativeElement.textContent).not.toContain('Content that requires delete permission');
    expect(fixture.nativeElement.textContent).toContain('Does not have permission');
  });

  it('should not render content without permission', () => {
    $allowedPermissions.set([]);
    fixture.detectChanges();
    expect(fixture.nativeElement.textContent).not.toContain('Content that requires read permission');
    expect(fixture.nativeElement.textContent).not.toContain('Content that requires create permission');
    expect(fixture.nativeElement.textContent).not.toContain('Content that requires delete permission');
    expect(fixture.nativeElement.textContent).toContain('Does not have permission');
  });
});