This script would run in parallel on Chrome, Firefox, and Internet Explorer which are registered on different ports and attached to a single hub. It is time for some automated cross browser testing! I will be running an automation script demonstrating the Selenium testing Grid for parallel execution. Run Selenium Grid For Parallel Automation Testing Now, that we have our Selenium Grid setup configured, your next step is to perform Selenium automation testing for your cross browser testing suite. Here is the output screenshot for further reference: You can notice by above commands that we are running our first node for chrome driver on port 4546, the second node for firefox driver is running on port 5566, and the third node for IE browser is running on port 4547. Also, before running your test on IE, make sure that the browser zoom is exactly 100% otherwise it might show an error. Note: Please make sure that you select different ports for different nodes to connect with the single hub running on port 4444. Open a command prompt or terminal and navigate to the directory where the Selenium Standalone Server jar file is saved. The first step of a Selenium Grid setup would be to create a hub. Download and extract Selenium Standalone server JAR files.You can go for the latest one if you wish. Though most people recommend going for the latest JDK, I prefer an earlier tried and tested versions like JDK SE 08 or 09. You would have to make sure that your system has Java Runtime Environment (JRE) or better yet Java Development Kit (JDK) installed.Step 2: Defining the nodes and connecting to that hub. Infrastructure to configuring a Selenium Grid setup for parallel execution Selenium nodes are referred as clients connected to a server i.e. It is not mandatory for the node to run on the same platform on which the hub is running. There can be multiple nodes configured with a different operating system and different browsers. Nodes are the test machines that execute the test that was earlier loaded on the hub. A Selenium Hub is referred as the server. There is only one hub in a network which is assigned to a test of DesiredCapabilities(operating system, browser, browser versions) and then the hub finds the test that matches the given configurations. That manages the network of the test machines. It is the center of the Selenium Grid architecture Selenium Grid is comprised of two concepts: Selenium Grid 3 has been deprecated and the official Selenium documentation recommends using the Selenium Grid 4. With Selenium Grid, you can connect a server to multiple remote machines which can then be used to run a browser automation script over multiple browser + OS configurations, simultaneously. Here, the Server is known as the Hub which has multiple Clients to interact with. Selenium Grid allows parallel testing against various browsers & OS combinations through a Client-Server model.
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