test(models/domain): test instantiation

src/app/models/Product.spec.ts

@@ -0,0 +1,7 @@
+import { Product } from './Product';
+
+describe('Product', () => {
+  it('should create', () => {
+    expect(new Product('1212121121', 'Mock Product', 'product.png', 1)).toBeTruthy();
+  });
+});