Driver info: driver.version: unknown (Behat\Mink\Exception\DriverException) error with Selenium and Geckodriver

Question

Here's the situation: I'm using Behat to run acceptance tests on Symfony. To do so, I start a Selenium instance with the Geckodriver, then I run Behat. Everything works fine on local (great!).

But when it runs on Github action, it fails. I've check the versions, I've even versioned the geckodriver and selenium.jar files to use exactly the same (despite they already exist on github action), but nothing works.

So I'm looking for any help to debug this error. Here's the commands and their results:

$ java -jar -Dwebdriver.gecko.driver=/usr/local/share/gecko_driver /usr/share/java/selenium-server-standalone.jar &

14:19:46.106 INFO [GridLauncherV3.parse] - Selenium server version: 3.141.59, revision: e82be7d358
14:19:46.369 INFO [GridLauncherV3.lambda$buildLaunchers$3] - Launching a standalone Selenium Server on port 4444
2020-05-29 14:19:46.780:INFO::main: Logging initialized @1350ms to org.seleniumhq.jetty9.util.log.StdErrLog
14:19:47.657 INFO [WebDriverServlet.<init>] - Initialising WebDriverServlet
14:19:47.758 INFO [SeleniumServer.boot] - Selenium Server is up and running on port 4444

./vendor/bin/behat -s acceptance

Could not open connection: Unable to create new service: GeckoDriverService
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
System info: host: 'fv-az33', ip: '10.1.0.4', os.name: 'Linux', os.arch: 'amd64', os.version: '5.3.0-1022-azure', java.version: '1.8.0_252'
Driver info: driver.version: unknown (Behat\Mink\Exception\DriverException)

Answer 1

Ok, I've just solved my problem. I think this is due to two things:

• First, I was not using the headless mode. I don't know to set it using Geckodriver because I'm finally using Chromedriver
• Second, the github action's doc is misleading. It says 'Chrome Driver is available via CHROMEWEBDRIVER environment variable', but in fact it's only the directory which is in the env var. So the path of the driver is $CHROMEWEBDRIVER/chromedriver (same for $GECKOWEBDRIVER)

---

For info, here's my config of behat:

javascript_session:
  selenium2:
  browser: chrome
  capabilities:
    chrome:
      switches:
        - "--headless"
        - "--disable-gpu"

And to run Selenium:

java -Dwebdriver.chrome.driver=$CHROMEWEBDRIVER/chromedriver -jar $SELENIUM_JAR_PATH &