Add Jest testing framework

README.md

@@ -74,12 +74,40 @@ window.addEventListener('load', function () {
 
 ## Start the demo
 
+### Docker
+
 1. Install the development server packages.
 
         $ docker run --rm -w /app -v $PWD:/app -u $(id -u):$(id -u) node npm install
 
 2. Start the server.
 
-        $ docker run --rm --init -it -w /app -v $PWD:/app -p 8080:8080 node node dev-server.js
+        $ docker run --rm --init -it -w /app -v $PWD:/app -p 8080:8080 node npm run start
 
 3. Visit `localhost:8080` to view.
+
+### Debian
+
+1. Install the development server packages.
+
+        $ npm install
+
+2. Start the server.
+
+        $ npm run start
+
+3. Visit `localhost:8080` to view.
+
+## Tests
+
+Requires Chrome/ChromeDriver or Chromium/ChromiumDriver.
+
+### Docker
+
+    $ docker run --rm --init -it -w /app -v $PWD:/app node bash -c "apt-get \
+        update && apt-get install -y chromium-driver chromium && npm run test"
+
+### Debian
+
+    $ apt-get update && apt-get install chromium-driver chromium
+    $ npm run test

__tests__/integration/page.spec.js

@@ -0,0 +1,21 @@
+const { Builder } = require('selenium-webdriver');
+const chrome = require('selenium-webdriver/chrome');
+const chromeOptions = new chrome.Options();
+
+let driver;
+
+chromeOptions.addArguments('--headless', '--disable-gpu', '--no-sandbox');
+
+beforeEach(async () => {
+  const builder = new Builder().forBrowser('chrome').setChromeOptions(chromeOptions);
+  driver = builder.build();
+});
+
+it('loads the page', async () => {
+  await driver.get('http://localhost:8080');
+  expect(await driver.getTitle()).toEqual('SVG Element Pan & Zoom Demo');
+});
+
+afterEach(async () => {
+  await driver.quit();
+});

__tests__/integration/setup.js

@@ -0,0 +1,21 @@
+const { spawn } = require('child_process');
+
+module.exports = async function (globalConfig, projectConfig) {
+  console.info('\nSpawning server process...');
+  const child = spawn('node', ['server.js']);
+
+  child.stdout.on('data', data => {
+    console.log(`${data}`);
+  });
+
+  globalThis.__INTEG_TEST_SERVER_PID__ = child.pid;
+
+  child.stderr.on('data', data => {
+    const str = data.toString();
+    console.log('[server]', str);
+
+    if (str.includes(projectConfig.globals.testServerUrl)) {
+      setTimeout(resolve, 200);
+    }
+  });
+};

__tests__/integration/teardown.js

@@ -0,0 +1,4 @@
+module.exports = async function (globalConfig, projectConfig) {
+  console.info('Stopping server.');
+  process.kill(globalThis.__INTEG_TEST_SERVER_PID__);
+};

dev-server.js

@@ -1,11 +0,0 @@
-require('esbuild-server')
-  .createServer(
-    {
-      bundle: true,
-      entryPoints: ['src/app.js'],
-    },
-    {
-      static: 'public',
-    }
-  )
-  .start();

jest.config.js

@@ -0,0 +1,219 @@
+/**
+ * For a detailed explanation regarding each configuration property, visit:
+ * https://jestjs.io/docs/configuration
+ */
+
+/** @type {import('jest').Config} */
+const config = {
+  // All imported modules in your tests should be mocked automatically
+  // automock: false,
+
+  // Stop running tests after `n` failures
+  // bail: 0,
+
+  // The directory where Jest should store its cached dependency information
+  // cacheDirectory: "/tmp/jest_rs",
+
+  // Automatically clear mock calls, instances, contexts and results before every test
+  clearMocks: true,
+
+  // Indicates whether the coverage information should be collected while executing the test
+  // collectCoverage: false,
+
+  // An array of glob patterns indicating a set of files for which coverage information should be collected
+  // collectCoverageFrom: undefined,
+
+  // The directory where Jest should output its coverage files
+  // coverageDirectory: undefined,
+
+  // An array of regexp pattern strings used to skip coverage collection
+  // coveragePathIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+
+  // Indicates which provider should be used to instrument code for coverage
+  coverageProvider: "v8",
+
+  // A list of reporter names that Jest uses when writing coverage reports
+  // coverageReporters: [
+  //   "json",
+  //   "text",
+  //   "lcov",
+  //   "clover"
+  // ],
+
+  // An object that configures minimum threshold enforcement for coverage results
+  // coverageThreshold: undefined,
+
+  // A path to a custom dependency extractor
+  // dependencyExtractor: undefined,
+
+  // Make calling deprecated APIs throw helpful error messages
+  // errorOnDeprecated: false,
+
+  // The default configuration for fake timers
+  // fakeTimers: {
+  //   "enableGlobally": false
+  // },
+
+  // Force coverage collection from ignored files using an array of glob patterns
+  // forceCoverageMatch: [],
+
+  // A path to a module which exports an async function that is triggered once before all test suites
+  // globalSetup: undefined,
+  globalSetup: './__tests__/integration/setup.js',
+
+  // A path to a module which exports an async function that is triggered once after all test suites
+  // globalTeardown: undefined,
+  globalTeardown: './__tests__/integration/teardown.js',
+
+  // A set of global variables that need to be available in all test environments
+  // globals: {},
+
+  // The maximum amount of workers used to run your tests. Can be specified as
+  // % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as
+  // the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
+  // maxWorkers: "50%",
+
+  // An array of directory names to be searched recursively up from the requiring module's location
+  // moduleDirectories: [
+  //   "node_modules"
+  // ],
+
+  // An array of file extensions your modules use
+  // moduleFileExtensions: [
+  //   "js",
+  //   "mjs",
+  //   "cjs",
+  //   "jsx",
+  //   "ts",
+  //   "tsx",
+  //   "json",
+  //   "node"
+  // ],
+
+  // A map from regular expressions to module names or to arrays of module
+  // names that allow to stub out resources with a single module
+  // moduleNameMapper: {},
+
+  // An array of regexp pattern strings, matched against all module paths
+  // before considered 'visible' to the module loader
+  // modulePathIgnorePatterns: [],
+
+  // Activates notifications for test results
+  // notify: false,
+
+  // An enum that specifies notification mode. Requires { notify: true }
+  // notifyMode: "failure-change",
+
+  // A preset that is used as a base for Jest's configuration
+  // preset: undefined,
+
+  // Run tests from one or more projects
+  // projects: undefined,
+
+  // Use this configuration option to add custom reporters to Jest
+  // reporters: undefined,
+
+  // Automatically reset mock state before every test
+  // resetMocks: false,
+
+  // Reset the module registry before running each individual test
+  // resetModules: false,
+
+  // A path to a custom resolver
+  // resolver: undefined,
+
+  // Automatically restore mock state and implementation before every test
+  // restoreMocks: false,
+
+  // The root directory that Jest should scan for tests and modules within
+  // rootDir: undefined,
+
+  // A list of paths to directories that Jest should use to search for files in
+  // roots: [
+  //   "<rootDir>"
+  // ],
+
+  // Allows you to use a custom runner instead of Jest's default test runner
+  // runner: "jest-runner",
+
+  // The paths to modules that run some code to configure or set up the testing environment before each test
+  // setupFiles: [],
+
+  // A list of paths to modules that run some code to configure or set up the testing framework before each test
+  // setupFilesAfterEnv: [],
+
+  // The number of seconds after which a test is considered as slow and reported as such in the results.
+  // slowTestThreshold: 5,
+
+  // A list of paths to snapshot serializer modules Jest should use for snapshot testing
+  // snapshotSerializers: [],
+
+  // The test environment that will be used for testing
+  //testEnvironment: "jsdom",
+  testEnvironment: "node",
+
+  // Options that will be passed to the testEnvironment
+  // testEnvironmentOptions: {},
+
+  // Adds a location field to test results
+  // testLocationInResults: false,
+
+  // The glob patterns Jest uses to detect test files
+  // testMatch: [
+  //   "**/__tests__/**/*.[jt]s?(x)",
+  //   "**/?(*.)+(spec|test).[tj]s?(x)"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
+  // testPathIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+  testPathIgnorePatterns: [
+    "/node_modules/",
+    "setup.js",
+    "teardown.js",
+  ],
+
+  // The regexp pattern or array of patterns that Jest uses to detect test files
+  // testRegex: [],
+
+  // This option allows the use of a custom results processor
+  // testResultsProcessor: undefined,
+
+  // This option allows use of a custom test runner
+  // testRunner: "jest-circus/runner",
+
+  // A map from regular expressions to paths to transformers
+  // transform: undefined,
+
+  // An array of regexp pattern strings that are matched against all source
+  // file paths, matched files will skip transformation
+  // transformIgnorePatterns: [
+  //   "/node_modules/",
+  //   "\\.pnp\\.[^\\/]+$"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all modules
+  // before the module loader will automatically return a mock for them
+  // unmockedModulePathPatterns: undefined,
+
+  // Indicates whether each individual test should be reported during the run
+  // verbose: undefined,
+  verbose: true,
+
+  // An array of regexp patterns that are matched against all source file paths
+  // before re-running tests in watch mode
+  // watchPathIgnorePatterns: [],
+
+  // Whether to use watchman for file crawling
+  // watchman: true,
+
+  // Shuffle the order of the tests within a file
+  randomize: true,
+};
+
+console.info('Jest config file read.');
+
+module.exports = config;

package.json

@@ -7,7 +7,7 @@
     "./src/modules"
   ],
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jest"
   },
   "repository": {
     "type": "git",
@@ -18,10 +18,12 @@
     "pan",
     "zoom"
   ],
-  "author": "Catalin Mititiuc",
+  "author": "Catalin Mititiuc <webdevcat@proton.me> (https://webdevcat.me)",
   "license": "ISC",
   "devDependencies": {
     "esbuild": "^0.20.2",
-    "esbuild-server": "^0.3.0"
+    "esbuild-server": "^0.3.0",
+    "jest": "^29.7.0",
+    "selenium-webdriver": "^4.29.0"
   }
 }

server.js

@@ -0,0 +1,27 @@
+const { createServer } = require('esbuild-server');
+
+//https://esbuild.github.io/api/#build
+const buildOptions = {
+  bundle: true,
+  entryPoints: ['src/app.js'],
+};
+
+//https://github.com/oblador/esbuild-server?tab=readme-ov-file#serveroptions
+const serverOptions = {
+  static: 'public',
+};
+
+const env = process.env.NODE_ENV === 'test' ? 'Test' : 'Development';
+const server = createServer(buildOptions, serverOptions);
+const buildStart = Date.now();
+
+server
+  .start()
+  .then(() => {
+    console.log(`Build completed in ${Date.now() - buildStart}ms`);
+  })
+  .catch(() => {
+    console.error('Build failed');
+  });
+
+console.log(`${env} server running at ${server.url}`);