benefits of selenium grid code example

Example 1: advantages of selenium grid

It allows running test cases in parallel thereby saving test execution time.
It allows multi-browser testing.
It allows multi-OS testing.
It allows multi-platform testing (desktop, mobile).

Example 2: how selenium grid looks like

-it's a java program looks like jar file
-we run this jar from 2 roles: hub and node
-hub receives commands Webdriver object of the client
-then hub is looking for available nodes 
 for execution.
-nodes are executing tests