feat(e2e-tests) simplify e2e test structure

packages/core/scripts/e2e.js

@@ -1,3 +1,131 @@
 'use strict';
 
-require('./e2e-test-runner').run();
+const fs = require('fs');
+const glob = require('glob');
+const Mocha = require('mocha');
+const path = require('path');
+const webdriver = require('selenium-webdriver');
+
+const Page = require('./E2ETestPage');
+const Snapshot = require('./Snapshot');
+
+let driver;
+let snapshot;
+let specIndex = 0;
+let takeScreenshots = false;
+
+function startDevServer() {
+  const server = require('@stencil/dev-server/dist'); // TODO: fix after stencil-dev-server PR #16 is merged
+  const cmdArgs = ['--config', path.join(__dirname, '../stencil.config.js'), '--no-open'];
+
+  return server.run(cmdArgs);
+}
+
+function generateTestId() {
+  let chars = 'abcdefghjkmnpqrstuvwxyz';
+  let id = chars.charAt(Math.floor(Math.random() * chars.length));
+  chars += '0123456789';
+  while (id.length < 3) {
+    id += chars.charAt(Math.floor(Math.random() * chars.length));
+  }
+  return id;
+}
+
+function getTestFiles() {
+  return new Promise((resolve, reject) => {
+    const src = path.join(__dirname, '../src/**/e2e.js');
+    glob(src, (err, files) => {
+      if (err) {
+        reject(err);
+      } else {
+        resolve(files);
+      }
+    });
+  });
+}
+
+function processCommandLine() {
+  process.argv.forEach(arg => {
+    if (arg === '--snapshot') {
+      takeScreenshots = true;
+    }
+  });
+}
+
+function registerE2ETest(desc, tst) {
+  // NOTE: Do not use an arrow function here because: https://mochajs.org/#arrow-functions
+  it(desc, async function() {
+    await tst(driver);
+    if (takeScreenshots) {
+      await snapshot.takeScreenshot(driver, {
+        name: this.test.fullTitle(),
+        specIndex: specIndex++
+      });
+    }
+    return Promise.resolve(true);
+  });
+}
+
+function getTotalTests(suite) {
+  let ttl = suite.tests.length;
+  suite.suites.forEach(s => (ttl += getTotalTests(s)));
+  return ttl;
+}
+
+async function run() {
+  const mocha = new Mocha({
+    timeout: 5000,
+    slow: 2000
+  });
+
+  driver = new webdriver.Builder().forBrowser('chrome').build();
+
+  processCommandLine();
+
+  const devServer = await startDevServer();
+
+  const files = await getTestFiles();
+  files.forEach(f => mocha.addFile(f));
+  mocha.loadFiles(() => {
+    specIndex = 0;
+
+    snapshot = new Snapshot({
+      groupId: 'ionic-core',
+      appId: 'snapshots',
+      testId: generateTestId(),
+      domain: 'ionic-snapshot-go.appspot.com',
+      // domain: 'localhost:8080',
+      sleepBetweenSpecs: 750,
+      totalSpecs: getTotalTests(mocha.suite),
+      platformDefaults: {
+        browser: 'chrome',
+        platform: 'linux',
+        params: {
+          platform_id: 'chrome_400x800',
+          platform_index: 0,
+          platform_count: 1,
+          width: 400,
+          height: 800
+        }
+      },
+      accessKey: process.env.IONIC_SNAPSHOT_KEY
+    });
+
+    mocha.run(function(failures) {
+      process.on('exit', function() {
+        process.exit(failures); // exit with non-zero status if there were failures
+      });
+      if (takeScreenshots) {
+        snapshot.finish();
+      }
+      devServer.close();
+      driver.quit();
+    });
+  });
+}
+
+module.exports = {
+  Page,
+  register: registerE2ETest,
+  run: run
+};