How to Fix: Facebook\WebDriver\Exception\UnknownErrorException: unknown error: cannot find Chrome binary – Laravel Dusk

When run the following command in your Laravel Automation Tool Dusk:

php artisan dusk

You get something like the following error:

[[email protected] blog]$ php artisan dusk
PHPUnit 9.3.11 by Sebastian Bergmann and contributors.

E                                                                   1 / 1 (100%)

Time: 00:00.339, Memory: 18.00 MB

There was 1 error:

1) Tests\Browser\ExampleTest::testBasicExample
Facebook\WebDriver\Exception\UnknownErrorException: unknown error: cannot find Chrome binary

/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/php-webdriver/webdriver/lib/Exception/WebDriverException.php:139
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/php-webdriver/webdriver/lib/Remote/HttpCommandExecutor.php:370
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/php-webdriver/webdriver/lib/Remote/RemoteWebDriver.php:136
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/tests/DuskTestCase.php:40
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/laravel/dusk/src/Concerns/ProvidesBrowser.php:200
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/laravel/framework/src/Illuminate/Support/helpers.php:234
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/laravel/dusk/src/Concerns/ProvidesBrowser.php:201
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/laravel/dusk/src/Concerns/ProvidesBrowser.php:95
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/laravel/dusk/src/Concerns/ProvidesBrowser.php:65
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/tests/Browser/ExampleTest.php:21

ERRORS!
Tests: 1, Assertions: 0, Errors: 1.

The error actually appears because you do not have Chrome browser installed on your system. Now, exit from your user shell, and drop back to the root shell. From the root shell, if you are using CentOS 7, you may run the following:

First Download the Latest Chrome RPM:

wget https://dl.google.com/linux/direct/google-chrome-stable_current_x86_64.rpm

Run it with YUM:

yum install ./google-chrome-stable_current_*.rpm

If you are on CentOS 8, you may use dnf installer as following:

dnf localinstall google-chrome-stable_current_x86_64.rpm

Once the installation is done, you may now go back to the user shell and run laravel dusk:

[[email protected] lib64]# su - elastic-keldysh
Last login: Thu Oct  1 15:39:18 IST 2020 on pts/0
[[email protected] ~]$ php artisan dusk
Could not open input file: artisan
[[email protected] ~]$ cd blog
[[email protected] blog]$ php artisan dusk
PHPUnit 9.3.11 by Sebastian Bergmann and contributors.

R                                                                   1 / 1 (100%)

Time: 00:02.367, Memory: 18.00 MB

There was 1 risky test:

1) Tests\Browser\ExampleTest::testBasicExample
This test did not perform any assertions

/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/tests/Browser/ExampleTest.php:16

OK, but incomplete, skipped, or risky tests!
Tests: 1, Assertions: 0, Risky: 1.

It shall work now. Hope this helps.

How to Fix : Failed to connect to localhost port 9515: Connection refused

If you are looking at this post, chances high that, you are trying to run laravel dusk and seeing the following kind of error:

[[email protected] blog]$ php artisan dusk
PHPUnit 9.3.11 by Sebastian Bergmann and contributors.

E                                                                   1 / 1 (100%)

Time: 00:00.331, Memory: 18.00 MB

There was 1 error:

1) Tests\Browser\ExampleTest::testBasicExample
Facebook\WebDriver\Exception\WebDriverCurlException: Curl error thrown for http POST to /session with params: {"capabilities":{"firstMatch":[{"browserName":"chrome","goog:chromeOptions":{"binary":"","args":["--disable-gpu","--headless"]}}]},"desiredCapabilities":{"browserName":"chrome","platform":"ANY","chromeOptions":{"binary":"","args":["--disable-gpu","--headless"]}}}

Failed to connect to localhost port 9515: Connection refused

/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/php-webdriver/webdriver/lib/Remote/HttpCommandExecutor.php:331
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/php-webdriver/webdriver/lib/Remote/RemoteWebDriver.php:136
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/tests/DuskTestCase.php:40
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/laravel/dusk/src/Concerns/ProvidesBrowser.php:200
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/laravel/framework/src/Illuminate/Support/helpers.php:234
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/laravel/dusk/src/Concerns/ProvidesBrowser.php:201
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/laravel/dusk/src/Concerns/ProvidesBrowser.php:95
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/vendor/laravel/dusk/src/Concerns/ProvidesBrowser.php:65
/var/www/vhosts/elastic-keldysh.139-99-24-82.plesk.page/blog/tests/Browser/ExampleTest.php:21

ERRORS!
Tests: 1, Assertions: 0, Errors: 1.

Chorme/Chromium browser runs it’s on 9515 port and laravel dusk tries to connect to it through the Browser binary, but failing to do so. To resolve the case, we first, need to check if chromedriver for linux can run or not.

First, browse your laravel root directory, in my case, it’s the blog directory and then run the chromedriver for linux as following:

cd blog
vendor/laravel/dusk/bin/chromedriver-linux

This should return something like the following if the driver able to load in memory:

[[email protected] blog]$ vendor/laravel/dusk/bin/chromedriver-linux
Starting ChromeDriver 85.0.4183.87 (cd6713ebf92fa1cacc0f1a598df280093af0c5d7-refs/branch-heads/[email protected]{#1689}) on port 9515
Only local connections are allowed.
Please see https://chromedriver.chromium.org/security-considerations for suggestions on keeping ChromeDriver safe.
ChromeDriver was started successfully.

But if it can not be loaded, it will return some kind of error like the following:

[[email protected] blog]$ vendor/laravel/dusk/bin/chromedriver-linux
vendor/laravel/dusk/bin/chromedriver-linux: error while loading shared libraries: libX11-xcb.so.1: cannot open shared object file: No such file or directory

As the error suggests, it is failing to access the library called libX11-xcb. To install it in CentOS, you may run the following from root shell:

[[email protected] lib64]# yum install libX11-xcb*

Once you see the following:

Installed:
  libX11-xcb-1.6.8-3.el8.x86_64

Complete!

You may now, go back to the user shell, and run the chromedriver-linux again:

[[email protected] lib64]# su - elastic-keldysh
Last login: Thu Oct  1 15:28:29 IST 2020 on pts/0
[[email protected] ~]$ cd blog
[[email protected] blog]$ vendor/laravel/dusk/bin/chromedriver-linux
Starting ChromeDriver 85.0.4183.87 (cd6713ebf92fa1cacc0f1a598df280093af0c5d7-refs/branch-heads/[email protected]{#1689}) on port 9515
Only local connections are allowed.
Please see https://chromedriver.chromium.org/security-considerations for suggestions on keeping ChromeDriver safe.
ChromeDriver was started successfully.

Now, you may run the following to start using the laravel dusk:

php artisan dusk

After you are done resolving the 9515 error, you might also have to face another error with Chrome Binary, have a look at the following on how to resolve the error: