feat(testing): adds Jest config and one small test

.babelrc

@@ -0,0 +1,7 @@
+{
+  "env": {
+    "test": {
+      "plugins": ["transform-es2015-modules-commonjs"]
+   }
+  }
+}

.travis.yml

@@ -5,6 +5,9 @@ node_js:
   - "lts/*"
 cache:
   yarn: true
+  directories:
+    - "node_modules"
+    - $HOME/.mongodb-binaries # For mongodb-memory-server
 
 env:
   global:
@@ -18,5 +21,6 @@ before_install:
 
 script:
   - yarn lint
+  - yarn test-ci # Running inband is recommended for CI see https://github.com/facebook/jest/issues/3765
   - commitlint-travis
   - 'if [ "${TRAVIS_PULL_REQUEST}" = "false" ] ; then ./scripts/deploy.sh ; fi'

jest.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+  globalSetup: './test/utils/setup.js',
+  globalTeardown: './test/utils/teardown.js',
+  testEnvironment: './test/utils/mongo-environment.js'
+};

package.json

@@ -22,9 +22,11 @@
     "format": "prettier --write es5 './**/*.js' && yarn lint",
     "lint": "eslint ./**/*.js --fix",
     "prepare-production": "snyk protect",
+    "snyk-test": "snyk test",
     "start":
       "nodemon ./node_modules/serverless/bin/serverless offline start --skipCacheInvalidation",
-    "test": "snyk test"
+    "test": "jest --runInBand",
+    "test-ci": "node_modules/.bin/jest --runInBand"
   },
   "config": {
     "commitizen": {
@@ -60,6 +62,7 @@
     "@commitlint/cli": "^6.1.3",
     "@commitlint/config-conventional": "^6.1.3",
     "@commitlint/travis-cli": "^6.1.3",
+    "babel-plugin-transform-es2015-modules-commonjs": "^6.26.0",
     "commitizen": "^2.9.6",
     "cz-customizable": "^5.2.0",
     "eslint": "^4.19.1",
@@ -68,14 +71,27 @@
     "eslint-plugin-prefer-object-spread": "^1.2.1",
     "eslint-plugin-react": "^7.7.0",
     "husky": "^0.14.3",
+    "jest": "^22.4.3",
+    "jest-cli": "^22.4.3",
     "lint-staged": "^7.0.4",
+    "mongodb-memory-server": "^1.7.3",
     "nodemon": "^1.17.3",
     "prettier": "^1.11.1",
     "prettier-package-json": "^1.5.1",
     "snyk": "^1.71.0",
     "source-map-support": "^0.5.4"
   },
   "keywords": ["open-api"],
+  "jest": {
+    "testEnvironment": "node",
+    "testPathIgnorePatterns": ["/node_modules/", "./dist"],
+    "coverageReporters": ["lcov", "html"],
+    "coverageDirectory": "./coverage/",
+    "collectCoverage": true,
+    "moduleNameMapper": {
+      "^mongoose$": "<rootDir>/node_modules/mongoose"
+    }
+  },
   "lint-staged": {
     "*.{js,json,css}": ["prettier --write", "git add"],
     "package.json": ["prettier-package-json --write", "git add"]

test/user.test.js

@@ -0,0 +1,48 @@
+const mongoose = require('mongoose');
+const { graphql } = require('graphql');
+const { makeExecutableSchema } = require('graphql-tools');
+import typeDefs from '../graphql/typeDefs';
+import resolvers from '../graphql/resolvers';
+const graphqlSchema = makeExecutableSchema({
+  typeDefs,
+  resolvers,
+  logger: console
+});
+
+const UserModel = require('../dataLayer/model/user.js');
+
+let connection;
+let db;
+
+beforeAll(async () => {
+  connection = await mongoose.connect(global.__MONGO_URI__);
+});
+
+afterAll(async () => {
+  await mongoose.disconnect();
+});
+
+it('should return a user after one has been created', async () => {
+  const user = new UserModel({
+    name: 'user',
+    email: 'user@example.com'
+  });
+
+  const newUser = await user.save();
+
+  //language=GraphQL
+  const query = `
+      query {
+          users {
+              name
+              email
+          }
+      }
+    `;
+
+  const rootValue = {};
+  const result = await graphql(graphqlSchema, query, rootValue);
+  const { data } = result;
+
+  expect(data.users[0].name).toBe(user.name);
+});

test/utils/mongo-environment.js

@@ -0,0 +1,24 @@
+const NodeEnvironment = require('jest-environment-node');
+
+class MongoEnvironment extends NodeEnvironment {
+  constructor(config) {
+    super(config);
+  }
+
+  async setup() {
+    this.global.__MONGO_URI__ = await global.__MONGOD__.getConnectionString();
+    this.global.__MONGO_DB_NAME__ = global.__MONGO_DB_NAME__;
+
+    await super.setup();
+  }
+
+  async teardown() {
+    await super.teardown();
+  }
+
+  runScript(script) {
+    return super.runScript(script);
+  }
+}
+
+module.exports = MongoEnvironment;

test/utils/setup.js

@@ -0,0 +1,16 @@
+const MongodbMemoryServer = require('mongodb-memory-server');
+
+const MONGO_DB_NAME = 'jest';
+const mongod = new MongodbMemoryServer.default({
+  instance: {
+    dbName: MONGO_DB_NAME
+  },
+  binary: {
+    version: '3.2.19'
+  }
+});
+
+module.exports = function() {
+  global.__MONGOD__ = mongod;
+  global.__MONGO_DB_NAME__ = MONGO_DB_NAME;
+};

test/utils/teardown.js

@@ -0,0 +1,3 @@
+module.exports = async function() {
+  await global.__MONGOD__.stop();
+};