10+ Cognizant QA Engineer Interview Questions and Answers

Reverse a string and find duplicate characters in it.

• Use built-in functions like reverse() and count() in Python.

• Loop through the string and compare each character with the rest of the string to find duplicates.

• Create a dictionary to store the count of each character and return the duplicates.

• Convert the string to an array, reverse it, and join it back to get the reversed string.

Dynamically changing objects can be identified by using unique attributes like ID, class, or XPath.

• Inspect the object in the DOM to find unique identifiers like ID, class, or XPath

• Use tools like Chrome Developer Tools or Firebug to identify dynamic changes

• Monitor changes in the object's attributes or properties during automation testing

To fetch data from xls, use a library like Apache POI or OpenPyXL.

• Use a library like Apache POI or OpenPyXL to read data from xls files

• Identify the sheet and cell range to read data from

• Iterate through the rows and columns to extract the data

• Handle any formatting or data type conversions as needed

Types of waits in Selenium include implicit, explicit, and fluent waits.

• Implicit waits wait for a certain amount of time before throwing an exception if an element is not found.

• Explicit waits wait for a certain condition to be met before proceeding with the next step.

• Fluent waits wait for a certain condition to be met within a specified time frame.

• Examples of conditions include element visibility, element clickability, and text presence.

• Examples of time frames include seconds...read more

I have 3 years of experience in Automation testing using tools like Selenium and Appium.

• Developed automated test scripts for web applications using Selenium WebDriver

• Performed mobile automation testing using Appium for iOS and Android applications

• Integrated automation scripts with continuous integration tools like Jenkins

Dynamic elements can be searched using unique attributes like ID, class, name, or XPath.

• Use ID attribute if it's unique and static

• Use class attribute if it's unique and dynamic

• Use name attribute if it's unique and static

• Use XPath if other attributes are not unique or not available

We used Selenium WebDriver with TestNG framework for automated testing in our previous project.

• Selenium WebDriver was used for automating web application testing

• TestNG framework was used for test case management and execution

• Integration with Jenkins for continuous integration

• Page Object Model design pattern was implemented for better test maintenance

To remove duplicate data, use data structures like sets or hashmaps to store unique values.

• Use a set to store unique values and then convert it back to an array

• Iterate through the array and check if the value already exists in the set before adding it

• Use a hashmap to store values as keys and their occurrences as values, then filter out values with occurrences greater than 1

A table can be identified by its structure, typically consisting of rows and columns.

• Look for a grid-like structure with rows and columns

• Check for headings or labels for each column

• Tables often contain data organized in a structured format