[js][http_api][01_base] Add base

Author: rgomezcasas

examples/js/js-http_api-01_base/.gitignore

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+node_modules/
+.tmp/

examples/js/js-http_api-01_base/babel.config.json

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+{
+    "presets": ["@babel/preset-env"],
+    "plugins": ["@babel/plugin-proposal-class-properties"]
+}

examples/js/js-http_api-01_base/jest.config.js

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+module.exports = {
+    testEnvironment: 'node',
+    verbose: true,
+    cacheDirectory: './.tmp/jestCache',
+    transform: {'^.+\\.js$': 'babel-jest'},
+    testMatch:[ "**/tests/**/*.[jt]s?(x)", "**/?(*.)+(spec|test).[jt]s?(x)" ],
+    moduleFileExtensions: ['js']
+};

examples/js/js-http_api-01_base/package-lock.json

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+{
+  "name": "student_grades",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest"
+  },
+  "author": "",
+  "license": "ISC",
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "jsx"
+    ],
+    "moduleDirectories": [
+      "node_modules",
+      "src"
+    ]
+  },
+  "devDependencies": {
+    "@babel/core": "^7.11.6",
+    "@babel/plugin-proposal-class-properties": "^7.10.4",
+    "@babel/preset-env": "^7.11.5",
+    "@jest/globals": "^26.4.2",
+    "jest": "^26.4.2"
+  },
+  "dependencies": {
+    "sync-mysql": "^3.0.1",
+    "sync-sql": "^1.0.2"
+  }
+}

examples/js/js-http_api-01_base/package.json

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+export class Course {
+    constructor(id, name, duration) {
+        this.id       = id;
+        this.name     = name;
+        this.duration = duration;
+    }
+}

examples/js/js-http_api-01_base/src/Course.js

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+import {Course} from "./Course";
+
+export class CourseCreator {
+    constructor(repository) {
+        this.repository = repository;
+    }
+
+    create(request) {
+        const course = new Course(request.body.id, request.body.name, request.body.duration);
+
+        this.repository.save(course);
+    }
+}

examples/js/js-http_api-01_base/src/CourseCreator.js

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+export class CoursesController {
+    constructor(courseCreator) {
+        this.courseCreator = courseCreator;
+    }
+
+    create(request) {
+        this.courseCreator.create(request);
+
+        return {status: 201};
+    }
+}

examples/js/js-http_api-01_base/src/CoursesController.js

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+import {MockCourseRepository} from "./MockCourseRepository";
+import {CoursesController}    from "../src/CoursesController";
+import {CourseCreator}        from "../src/CourseCreator";
+import {Course}               from "../src/Course";
+
+describe('CoursesController should', () => {
+    it('create a valid course', () => {
+        const request = {
+            body: {
+                id:       "659045a4-300c-4a49-aee6-a4d880cf3079",
+                name:     "Refactoring: Bloaters",
+                duration: 777
+            }
+        };
+
+        const expectedCourse = new Course("659045a4-300c-4a49-aee6-a4d880cf3079", "Refactoring: Bloaters", 777);
+
+        const repository = new MockCourseRepository(expectedCourse);
+        const creator    = new CourseCreator(repository);
+        const controller = new CoursesController(creator);
+
+        expect(controller.create(request)).toStrictEqual({status: 201});
+    });
+});

examples/js/js-http_api-01_base/tests/CoursesController.test.js

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+export class MockCourseRepository {
+    constructor(expectedCourseToBeSaved) {
+        this.expectedCourseToBeSaved = expectedCourseToBeSaved;
+    }
+
+    save(course) {
+        if (course.id !== this.expectedCourseToBeSaved.id ||
+            course.name !== this.expectedCourseToBeSaved.name ||
+            course.duration !== this.expectedCourseToBeSaved.duration
+        ) {
+            throw "The expected course and the actual are not the same";
+        }
+    }
+}