test(model/db): test instantiation

src/app/models/db/DBChain.spec.ts

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

src/app/models/db/DBEstablishment.spec.ts

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

src/app/models/db/DBProduct.spec.ts

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+import { DBProduct } from './DBProduct';
+
+describe('DBProduct', () => {
+  it('should create', () => {
+    expect(new DBProduct('121212112', 'product mock', 'mock.jpg', 1)).toBeTruthy();
+  });
+});

src/app/models/db/DBProductEstablishment.spec.ts

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

src/app/models/db/DBPurchase.spec.ts

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+import { DBPurchase } from './DBPurchase';
+
+describe('DBPurchase', () => {
+  it('should create', () => {
+    expect(new DBPurchase(1, 1, Date.now(), 1000, 1, 1)).toBeTruthy();
+  });
+});