test(models/domain): test instantiation

src/app/models/Establishment.spec.ts

@@ -0,0 +1,8 @@
+import { Chain } from './Chain';
+import { Establishment } from './Establishment';
+
+describe('Establishment', () => {
+  it('should create', () => {
+    expect(new Establishment(new Chain('mock', 'mock.jpg', 1), 'Mock street', 1)).toBeTruthy();
+  });
+});