ChromeDriver should fail fast if child process exits of its own accord

Author: Nokel81

lib/chrome-driver.js

@@ -3,6 +3,10 @@ const path = require('path');
 const { default: got } = require('got');
 const split = require('split');
 
+function delay(duration) {
+  return new Promise(resolve => global.setTimeout(resolve, duration));
+}
+
 function ChromeDriver(
   host,
   port,
@@ -20,19 +24,18 @@ function ChromeDriver(
 
   this.path = require.resolve('electron-chromedriver/chromedriver');
   this.urlBase = '/';
-  this.statusUrl =
-    'http://' + this.host + ':' + this.port + this.urlBase + 'status';
+  this.statusUrl = `http://${this.host}:${this.port}${this.urlBase}status`;
   this.logLines = [];
 }
 
 ChromeDriver.prototype.start = function () {
   if (this.process) throw new Error('ChromeDriver already started');
 
-  const args = [this.path, '--port=' + this.port, '--url-base=' + this.urlBase];
+  const args = [this.path, `--port=${this.port}`, `--url-base=${this.urlBase}`];
 
   if (this.chromeDriverLogPath) {
     args.push('--verbose');
-    args.push('--log-path=' + this.chromeDriverLogPath);
+    args.push(`--log-path=${this.chromeDriverLogPath}`);
   }
   const options = {
     cwd: this.workingDirectory,
@@ -50,34 +53,30 @@ ChromeDriver.prototype.start = function () {
   return this.waitUntilRunning();
 };
 
-ChromeDriver.prototype.waitUntilRunning = function () {
-  const self = this;
-  return new Promise(function (resolve, reject) {
-    const startTime = Date.now();
-    const checkIfRunning = function () {
-      self.isRunning(function (running) {
-        if (!self.process) {
-          return reject(Error('ChromeDriver has been stopped'));
-        }
-
-        if (running) {
-          return resolve();
-        }
-
-        const elapsedTime = Date.now() - startTime;
-        if (elapsedTime > self.startTimeout) {
-          return reject(
-            Error(
-              'ChromeDriver did not start within ' + self.startTimeout + 'ms'
-            )
-          );
-        }
-
-        global.setTimeout(checkIfRunning, 100);
-      });
-    };
-    checkIfRunning();
-  });
+ChromeDriver.prototype.waitUntilRunning = async function () {
+  const startTime = Date.now();
+  for (;;) {
+    const isRunning = await this.isRunning();
+
+    if (!self.process) {
+      throw new Error('ChromeDriver has been stopped');
+    }
+
+    if (self.process.exitCode !== null) {
+      throw new Error(`ChromeDriver exited with code ${self.process.exitCode}`);
+    }
+
+    if (isRunning) {
+      return;
+    }
+
+    const elapsedTime = Date.now() - startTime;
+    if (elapsedTime > self.startTimeout) {
+      throw new Error(`ChromeDriver did not start within ${self.startTimeout}ms`);
+    }
+
+    await delay(100);
+  }
 };
 
 ChromeDriver.prototype.setupLogs = function () {
@@ -120,12 +119,13 @@ ChromeDriver.prototype.stop = function () {
   this.clearLogs();
 };
 
-ChromeDriver.prototype.isRunning = function (callback) {
-  const cb = false;
-  got(this.statusUrl)
-    .json()
-    .then(({ value }) => callback(value && value.ready))
-    .catch(() => callback(cb));
+ChromeDriver.prototype.isRunning = function () {
+  try {
+    const { value } = got(this.statusUrl).json();
+    return value && value.ready;
+  } catch (_) {
+    return false;
+  }
 };
 
 ChromeDriver.prototype.getLogs = function () {