Cross Browser Testing is a type of Functional Test to check whether web application works as expected on different browsers.
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Cross-browser testing is basically running the same set of test cases multiple times on different browsers.
Below two are the most intent of cross-browser testing,
Note: In recent years, testing mobile browsers are included on the Cross-Browser testing scope.
Any testing reaps the best benefits when it is done early on. Therefore, the industry recommendation is to start with it as soon as the page designs are available. Because finding and fixing bugs on early stages are very cost effective. Finding bugs after release or completion of application will not be a cost effective one.
Sure, it can be done manually. First, business needs to identify all browsers that the application needs to support. Tester need to run all the testcase against every identified browser and observe whether the appearance and functionality are same.
Through manual testing, it is not possible to cover many browsers and its major versions. So, performing cross browser testing manually will be costly and time-consuming too.
In an Agile world it’s not a good advice to do whole cross browser testing through manual.
As stated above, Cross-browser testing is basically running the same set of test cases multiple times on different browsers. This type of repeated task is best suited for automation. Thus, it’s more cost and time effective to perform this testing by using tools.
Selenium is well known for automated testing of the web-based applications. Just by changing the browser to be used for running the test cases, selenium makes it very easy to run the same test cases multiple times using different browsers.
Note: Rest of this blog we are going to see how Selenium can be used for Cross-Browser Testing.
By using TestNG along with Selenium Grid we can achieve parallel test execution on different browser in different machines. Let’s see TestNG and Selenium Grid on the following topics,
TestNG is an automation testing framework in which NG stands for “Next Generation”. TestNG is inspired from JUnit which uses the annotations (@). Default Selenium tests do not generate a proper format for the test results. Using TestNG we can generate test results.
Selenium Grid is a part of the Selenium Suite which specialise in running multiple tests across different browsers, operating system and machines. You can connect to it with Selenium Remote by specifying the browser, browser version, and operating system you want
In Selenium Grid, the HUB is a computer which is the central point where we can load our tests into. Hub also acts as a server because of which it acts as a central point to control the network of Test machines. The Selenium Grid has only one hub and it is the master of the network.
In Selenium Grid, a NODE is referred to a Test Machine which opts to connect with the Hub. This test machine will be used by Hub to run tests on. A Grid network can have multiple nodes. A node is supposed to have different platforms i.e. different operating system and browsers. The node does not need the same platform for running as that of hub.
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