Issue 6887 - add Chrome to "npm test"

test/browsers/firefox.js

Index: test/browsers/firefox.js
diff --git a/test/browsers/firefox.js b/test/browsers/firefox.js
new file mode 100644
index 0000000000000000000000000000000000000000..7f9cb9d531574ef5db813f2a0da4bc06c3572e03
--- /dev/null
+++ b/test/browsers/firefox.js
@@ -0,0 +1,56 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-present eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+const FIREFOX_VERSION = "57.0";
+
+const path = require("path");
+const webdriver = require("selenium-webdriver");
+const firefox = require("selenium-webdriver/firefox");
+const {Command} = require("selenium-webdriver/lib/command");
+const {ensureFirefox} = require("../../adblockpluscore/test/runners/" +
+                                "firefox_download");
+
+exports.platform = "gecko";
+
+exports.getDriver = function()
+{
+  return ensureFirefox(FIREFOX_VERSION).then(firefoxPath =>
+  {
+    let binary = new firefox.Binary(firefoxPath);
+    binary.addArguments("-headless");
+
+    let driver = new webdriver.Builder()
+      .forBrowser("firefox")
+      .setFirefoxOptions(new firefox.Options().setBinary(binary))
+      .build();
+
+    let devenv = "./devenv.gecko";
+    let cmd = new Command("moz-install-web-ext")
+      .setParameter("path", path.resolve(devenv))
+      .setParameter("temporary", true);
+
+    driver.getExecutor().defineCommand(
+      cmd.getName(), "POST",
+      "/session/:sessionId/moz/addon/install"
+    );
+    driver.schedule(cmd, `installWebExt(${devenv})`);
+
+    return driver;
+  });
+};