When we try to install dusk and run testing in local , we used to get below error, I am sharing here the fix for below issue (in windows -local)

Facebook\WebDriver\Remote\DesiredCapabilities::__construct(): Argument #1 ($capabilities) must be of type array, null given, called in C:\xampp\htdocs\timesheet-app\vendor\php-webdriver\webdriver\lib\Remote\RemoteWebDriver.php on line 664.

follow installation process from the laravel dusk website and after installation you need to go to the  below folder

‘C:\xampp\htdocs\<your project>\vendor\laravel\dusk\bin

chromedriver-win.exe file , run this in you local.

then try to find the port number from command

Copy the port number and use the same number in

Then run your Dusk test cases , it should wok.

it worked for us. Let us know if you need help in this..