Issue 6391 - Allow running the browser unit tests with Firefox

test/runners/firefox_process.js

Index: test/runners/firefox_process.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/test/runners/firefox_process.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 {Builder} = require("selenium-webdriver");
+const firefox = require("selenium-webdriver/firefox");
+require("geckodriver");
+
+const {executeScript} = require("./webdriver");
+const {ensureFirefox} = require("./firefox_download");
+
+const FIREFOX_VERSION = "60.0b4";

[kzar, 2018/08/03 15:22:50]

Shouldn't we use Firefox 51 here, since it's the earliest version we support?

[hub, 2018/08/03 16:13:53]

57 is the recommended (supported) minimum version of Firefox for the
`geckodriver`. 51 clearly doesn't work. I could get 56 to work, so I'll go with
56 for now.

[kzar, 2018/08/03 18:30:12]

Fair enough.

+
+function runScript(firefoxPath, script, scriptName, scriptArgs)
+{
+  let binary = new firefox.Binary(firefoxPath);
+  binary.addArguments("-headless");
+
+  const options = new firefox.Options()
+        .setBinary(binary);
+
+  const driver = new Builder()
+        .forBrowser("firefox")
+        .setFirefoxOptions(options)
+        .build();
+
+  return executeScript(driver, "Firefox", script, scriptName, scriptArgs);
+}
+
+module.exports = function(script, scriptName, ...scriptArgs)
+{
+  return ensureFirefox(FIREFOX_VERSION).then(firefoxPath =>
+  {
+    return runScript(firefoxPath, script, scriptName, scriptArgs)
+      .then(result => result)
+      .catch(error =>

[kzar, 2018/08/03 15:22:50]

How come you catch the exception, only to re-throw it?

[hub, 2018/08/03 16:13:53]

catch() also deal with rejected promises.

[kzar, 2018/08/03 18:30:12]

Acknowledged.

+      {
+        throw error;
+      });
+  });
+};