test(models/domain): test instantiation

src/app/models/Chain.spec.ts

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+import { Chain } from './Chain';
+
+describe('Chain', () => {
+  it('should create', () => {
+    expect(new Chain('mock', 'mock.jpg', 1)).toBeTruthy();
+  });
+});

src/app/models/Establishment.spec.ts

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+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();
+  });
+});

src/app/models/Product.spec.ts

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

src/app/models/ProductEstablisment.spec.ts

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+import { Chain } from './Chain';
+import { Establishment } from './Establishment';
+import { Product } from './Product';
+import { ProductEstablishment } from './ProductEstablisment';
+
+describe('ProductEstablishment', () => {
+  it('should create', () => {
+    expect(
+      new ProductEstablishment(
+        new Product('12121212', 'mock product', 'mock.jpg', 1),
+        new Establishment(new Chain('mock', 'mock', 1)),
+        1,
+      ),
+    );
+  });
+});

src/app/models/Purchase.spec.ts

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+import { Chain } from './Chain';
+import { Establishment } from './Establishment';
+import { Product } from './Product';
+import { Purchase } from './Purchase';
+
+describe('Purchase', () => {
+  let purchase: Purchase;
+  beforeEach(() => {
+      purchase = new Purchase(
+        new Establishment(new Chain('mock', 'image_mock.png', 1), 'mock street', 1),
+        new Product('121212121221', 'mock product', 'image_mock.png', 1),
+        1254.51,
+      )
+  });
+
+  it('should create', () => {
+    expect(purchase).toBeTruthy();
+  });
+
+  it('should divide by 100 on price get and multiply by 100 on set', () => {
+    const PRICE_MOCK = 1475.56;
+    purchase.price = PRICE_MOCK;
+    expect(purchase.price).toBe(PRICE_MOCK);
+  });
+});