Initial development of test

package.json

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+{
+  "name": "@smokeball-dev/javascript-developer-test",
+  "version": "2.0.1",
+  "description": "",
+  "main": "./index.js",
+  "author": "Smokeball Development Team",
+  "license": "MIT",
+  "scripts": {
+    "test": "jest"
+  },
+  "dependencies": {
+    "jest": "25.1.0"
+  }
+}

src/get-urls.js

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+const { getUrlP } = require('./mock-http-interface');
+
+const getUrls = async (urls) => {
+  // TODO.
+};
+
+module.exports = {
+  getUrls,
+};

src/get-urls.test.js

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+const { getUrls } = require('./get-urls');
+
+const urls = [
+  'http://www.smokeballdev.com/url1',
+  'http://www.smokeballdev.com/url2',
+  'http://www.smokeballdev.com/url3',
+  'http://www.smokeballdev.com/url4',
+];
+
+test('expect no throws', () => {
+  expect.assertions(1);
+  expect(async () => results = await getUrls(urls)).not.toThrow(); 
+});
+
+test('responses to be correct', async () => {
+  expect.assertions(5);
+
+  const results = await getUrls(urls);
+  
+  expect(results.length).toBe(4);
+
+  expect(results[0]).toEqual({ 'Arnie Quote': 'Get to the chopper' });
+  expect(results[1]).toEqual({ 'Arnie Quote': 'MY NAME IS NOT QUAID' });
+  expect(results[2]).toEqual({ 'Arnie Quote': `What's wrong with Wolfie?` });
+  expect(results[3]).toEqual({ 'FAILURE': 'Your request has been terminated' });
+});
+
+test('code to be executed in less than 400ms', async () => {
+  expect.assertions(2);
+
+  const startTime = process.hrtime();
+  await getUrls(urls);
+  const [ seconds, nanos ] = process.hrtime(startTime);
+  
+  expect(seconds).toBe(0);
+  expect(nanos / 1000 / 1000).toBeLessThan(400);
+});

src/mock-http-interface.js

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+'use strict';
+
+const urlPrefix = `http://www.smokeballdev.com`;
+
+const urlToResponseLookup = {
+  [`${urlPrefix}/url1`]: 'Get to the chopper',
+  [`${urlPrefix}/url2`]: 'MY NAME IS NOT QUAID',
+  [`${urlPrefix}/url3`]: `What's wrong with Wolfie?`,
+};
+
+const slowHttpRequestMockP = (url) => new Promise((resolve, reject) => {
+  setTimeout(() => {
+    const responseData = urlToResponseLookup[url];
+    if (responseData) {
+      resolve(responseData);
+    } else {
+      reject(new Error('Your request has been terminated'));
+    }
+  }, 200);
+});
+
+const getUrlP = async (url) => {
+  try {
+    const message = await slowHttpRequestMockP(url);
+    return { status: 200, body: JSON.stringify({ message }) };
+  } 
+  catch (err) {
+    return { status: 500, body: JSON.stringify({ message: err.message }) };
+  }
+};
+
+module.exports = {
+  getUrlP,
+};