introduce CustomerRepository

Author: kaiosilveira

src/customer-repository/index.js

@@ -0,0 +1,22 @@
+import { Customer } from '../customer';
+
+let _data = [];
+
+export class CustomerRepository {
+  static initialize() {
+    _data = {};
+    _data.customers = new Map();
+  }
+
+  static register(id) {
+    if (!_data.customers.has(id)) {
+      _data.customers.set(id, new Customer(id));
+    }
+
+    return this.find(id);
+  }
+
+  static find(id) {
+    return _data.customers.get(id);
+  }
+}

src/customer-repository/index.test.js

@@ -0,0 +1,28 @@
+import { CustomerRepository } from './index';
+
+describe('CustomerRepository', () => {
+  beforeEach(() => {
+    CustomerRepository.initialize();
+  });
+
+  describe('register', () => {
+    it('should create a new customer', () => {
+      const customer = CustomerRepository.register('123');
+      expect(customer.id).toBe('123');
+    });
+
+    it('should return the existing customer', () => {
+      const customer = CustomerRepository.register('123');
+      const customer2 = CustomerRepository.register('123');
+      expect(customer).toBe(customer2);
+    });
+  });
+
+  describe('find', () => {
+    it('should find a customer', () => {
+      const customer = CustomerRepository.register('123');
+      const foundCustomer = CustomerRepository.find('123');
+      expect(customer).toBe(foundCustomer);
+    });
+  });
+});