fix: Fix the compiler test, and check if it worked. (#6638)

* Add tsick.js to rewrite enums.

tsc generates JavaScript which is incompatible with the Closure Compiler's advanced optimizations.

* Remove unused 'outputCode' variable.

* Rename 'run_X_in_browser.js' to 'webdriver.js'

The Mocha and generator tests can both be run either manually or via our webdriver.  In all cases they run in a browser.  These two 'run_X_in_browser.js' files only apply to webdriver, thus they are confusingly named.

Also delete completely unused (and broken) `run_all_tests.sh`

* Linting improvements to mocha/webdriver.js

Still not at 100%.  Complains about require/module/process/__dirname not being defined in multiple places.

* runTestBlock -> runTestFunction

'Block' means something very different in Blockly.

* Removal of `var` from scripts.

* Add webdriver test to verify compile test worked.

* Resolve conficts with 'develop'.

* Address PR comments.

tests/mocha/webdriver.js

@@ -0,0 +1,100 @@
+/**
+ * @license
+ * Copyright 2019 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @fileoverview Node.js script to run Mocha tests in Chrome, via webdriver.
+ */
+const webdriverio = require('webdriverio');
+const {posixPath} = require('../../scripts/helpers');
+
+
+/**
+ * Runs the Mocha tests in this directory in Chrome. It uses webdriverio to
+ * launch Chrome and load index.html. Outputs a summary of the test results
+ * to the console.
+ * @return {number} 0 on success, 1 on failure.
+ */
+async function runMochaTestsInBrowser() {
+  const options = {
+    capabilities: {
+      browserName: 'chrome',
+    },
+    services: [
+      ['selenium-standalone'],
+    ],
+    logLevel: 'warn',
+  };
+  // Run in headless mode on Github Actions.
+  if (process.env.CI) {
+    options.capabilities['goog:chromeOptions'] = {
+      args: [
+        '--headless', '--no-sandbox', '--disable-dev-shm-usage',
+        '--allow-file-access-from-files',
+      ],
+    };
+  } else {
+    // --disable-gpu is needed to prevent Chrome from hanging on Linux with
+    // NVIDIA drivers older than v295.20. See
+    // https://github.com/google/blockly/issues/5345 for details.
+    options.capabilities['goog:chromeOptions'] = {
+      args: ['--allow-file-access-from-files', '--disable-gpu'],
+    };
+  }
+
+  const url = 'file://' + posixPath(__dirname) + '/index.html';
+  console.log('Starting webdriverio...');
+  const browser = await webdriverio.remote(options);
+  console.log('Loading URL: ' + url);
+  await browser.url(url);
+
+  await browser.waitUntil(async() => {
+    const elem = await browser.$('#failureCount');
+    const text = await elem.getAttribute('tests_failed');
+    return text !== 'unset';
+  }, {
+    timeout: 50000,
+  });
+
+  const elem = await browser.$('#failureCount');
+  const numOfFailure = await elem.getAttribute('tests_failed');
+
+  if (numOfFailure > 0) {
+    console.log('============Blockly Mocha Test Failures================');
+    const failureMessagesEls = await browser.$$('#failureMessages p');
+    if (!failureMessagesEls.length) {
+      console.log('There is at least one test failure, but no messages reported. Mocha may be failing because no tests are being run.');
+    }
+    for (const el of failureMessagesEls) {
+      console.log(await el.getText());
+    }
+  }
+
+  console.log('============Blockly Mocha Test Summary=================');
+  console.log(numOfFailure + ' tests failed');
+  console.log('============Blockly Mocha Test Summary=================');
+  if (parseInt(numOfFailure) !== 0) {
+    return 1;
+  }
+  await browser.deleteSession();
+  return 0;
+}
+
+if (require.main === module) {
+  runMochaTestsInBrowser().catch((e) => {
+    console.error(e);
+    process.exit(1);
+  }).then(function(result) {
+    if (result) {
+      console.log('Mocha tests failed');
+      process.exit(1);
+    } else {
+      console.log('Mocha tests passed');
+      process.exit(0);
+    }
+  });
+}
+
+module.exports = {runMochaTestsInBrowser};