[js][data_repository][02_repository] Extract repository

Author: rgomezcasas

examples/js/js-data_repository-02_repository/src/MySqlUserRepository.js

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+export class MySqlUserRepository {
+    mysqlHost     = "localhost";
+    mysqlUser     = "root";
+    mysqlPassword = "";
+    mysqlDatabase = "super_project";
+    mysqlPort     = 3306;
+
+    constructor() {
+        const Mysql     = require('sync-mysql');
+        this.connection = new Mysql({
+            host: this.mysqlHost,
+            user: this.mysqlUser,
+            password: this.mysqlPassword,
+            database: this.mysqlDatabase,
+            port: this.mysqlPort
+        });
+    }
+
+    searchAll() {
+        return this.connection.query('SELECT * FROM users');
+    }
+}

examples/js/js-data_repository-02_repository/src/UserSearcher.js

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+export class UsersSearcher {
+    constructor(repository) {
+        this.repository = repository;
+    }
+
+    searchAll() {
+        return this.repository.searchAll();
+    }
+}

examples/js/js-data_repository-02_repository/src/UsersSearcher.js

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+export class FakeUserRepository {
+    constructor(users) {
+        this.users = users;
+    }
+
+    searchAll() {
+        return this.users;
+    }
+}

examples/js/js-data_repository-02_repository/tests/FakeUserRepository.js

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+import {FakeUserRepository} from "./FakeUserRepository";
+import {UsersSearcher}      from "../src/UsersSearcher";
+
+describe('UsersSearcher should', () => {
+    it('search all existing users', () => {
+        const existingUsers = [{"name": "javi"}, {"name": "rafa"}];
+        
+        const repository = new FakeUserRepository(existingUsers);
+        const searcher   = new UsersSearcher(repository);
+        
+        expect(searcher.searchAll()).toBe(existingUsers);
+    });
+});