200+ Senior QA Engineer Interview Questions and Answers

The task is to find all unique combinations in an array where the sum is equal to a given target sum, with elements in non-decreasing order.

• Use backtracking to generate all possible combinations.

• Sort the array to ensure elements are in non-decreasing order.

• Keep track of the current combination and sum while exploring the array.

• Recursively explore all possible combinations.

• Return the valid combinations that sum up to the target sum.

The task is to find the smallest number greater than the given number with the same set of digits.

• Iterate from right to left to find the first digit that can be swapped with a larger digit to make the number greater.

• Swap this digit with the smallest digit to its right that is larger than it.

• Sort all digits to the right of the swapped digit in ascending order to get the smallest number.

• If no such number exists, return -1.

• Example: For input '56789', output '56798'.

To get data from a file in Selenium, we can use Java IO classes and read the file content.

• Create a File object with the file path

• Create a FileReader object with the File object

• Create a BufferedReader object with the FileReader object

• Use the BufferedReader object to read the file content line by line

• Close the BufferedReader object

To count 45 minutes with 2 threads, burn the first thread at both ends and the second thread at one end.

• Burn the first thread at both ends, it will last for 15 minutes.

• At the same time, burn the second thread at one end.

• When the first thread is burnt out, light the other end of the second thread.

• The second thread will last for 30 minutes, completing the 45 minutes.

• This is an example of using logic and creativity to solve a problem.

QA is the process of preventing defects while QC is the process of identifying defects.

• QA focuses on preventing defects from occurring in the first place

• QC focuses on identifying defects after they have occurred

• QA is a proactive approach while QC is a reactive approach

• QA involves processes such as reviews, inspections, and testing

• QC involves processes such as testing, debugging, and fixing defects

• Example: QA involves creating test plans and test cases to prevent defects, whil...read more

QA plays a crucial role in identifying and communicating the discrepancies between built functionality and requirements.

• QA should thoroughly review the requirements documentation to understand the expected functionality.

• QA should conduct thorough testing to identify any discrepancies between the built functionality and the requirements.

• QA should communicate any discrepancies found to the development team and stakeholders for resolution.

• QA should work closely with the developm...read more

A test case can be excluded from execution by using tags or annotations.

• Add a tag or annotation to the test case with a specific value

• Configure the test runner to exclude test cases with that tag or annotation

• Use conditional statements in the test code to skip the test case based on certain conditions

Implemented automated test scripts using Selenium for regression testing, introduced code review process for test scripts, and conducted training sessions on new testing tools.

• Implemented automated test scripts using Selenium for regression testing

• Introduced code review process for test scripts

• Conducted training sessions on new testing tools

I currently hold 2 offer letters. My current CTC is $80,000 and my expected CTC is $90,000.

• I hold 2 offer letters

• Current CTC is $80,000

• Expected CTC is $90,000

Correlation in performance testing, AWS knowledge, parametrization vs correlation, challenges in correlation, motivating new customers for performance testing, using perfmon, rampup/rampdown/steady state, concurrent vs simultaneous users, matrices in HTML report

• Correlation in performance testing ensures that the response time of different components in a system are correlated to each other

• AWS knowledge is important for understanding cloud-based performance testing environment...read more

Regression, smoke, and functional testing are types of software testing. Severity and priority of bugs are important factors in bug reporting. Automation tools and frameworks are used to automate testing processes.

• Regression testing is performed to ensure that changes made to the software do not affect the existing functionality.

• Smoke testing is a quick test to ensure that the basic functionality of the software is working.

• Functional testing is performed to ensure that the so...read more

Program to find all possible combinations of elements from two sets of arrays such that the sum of elements is equal to one of the elements in the array itself.

• Create two arrays of integers

• Loop through both arrays and find all possible combinations

• Check if the sum of elements is equal to any element in the array

• Return all combinations that meet the criteria

List is an ordered collection of elements while Set is an unordered collection of unique elements.

• List allows duplicate elements while Set does not.

• List maintains the order of elements while Set does not.

• List is implemented using an array while Set is implemented using a hash table.

• Example: List - [1, 2, 3, 3, 4], Set - {1, 2, 3, 4}

Regression testing is testing the entire application after a change, while retesting is testing a specific bug fix.

• Regression testing is done to ensure that new code changes do not adversely affect existing functionality.

• Retesting is done to verify that a specific bug or issue has been fixed.

• Regression testing includes testing all the previously tested features to ensure they still work correctly.

• Retesting focuses on the specific bug or issue that was fixed.

• Examples of regres...read more

Various tools used for database, build deployment, bug tracking, and test case/plan tracking in QA engineering.

• Database: SQL Server, MySQL, Oracle

• Build Deployment: Jenkins, TeamCity, Bamboo

• Bug Tracking: Jira, Bugzilla, Redmine

• Test Case/Plan Tracking: TestRail, HP ALM, Zephyr

Yes, I am comfortable with coming to the office regularly in a hybrid model.

• I value face-to-face interactions with team members for better collaboration and communication.

• I am able to manage my time effectively to balance office and remote work.

• I understand the importance of being present in the office for certain tasks or meetings.

• I am adaptable and flexible in my work environment.

Quality Control focuses on identifying defects in the final product, while Quality Assurance focuses on preventing defects from occurring in the first place.

• Quality Control is product oriented, while Quality Assurance is process oriented

• Quality Control involves testing and inspecting the final product, while Quality Assurance involves establishing processes and standards to prevent defects

• Quality Control occurs after the product is developed, while Quality Assurance occurs th...read more

Program to find the next bigger number for the given number by interchanging its digits.

• Convert the number to a string to access individual digits

• Start from the rightmost digit and find the first digit that is smaller than the digit to its right

• Swap this digit with the smallest digit to its right that is greater than it

• Sort the digits to the right of the swapped digit in ascending order

• Convert the string back to a number and return

Count the number of substrings with equal number of 0s, 1s, and 2s in a given string.

• Iterate through the string and maintain counts of 0s, 1s, and 2s encountered so far.

• Keep track of the counts in a hashmap and increment the count of substrings whenever counts of 0s, 1s, and 2s are equal.

• Return the total count of substrings at the end.

Use a test automation tool like Selenium or Appium to run test cases without compiling in Java.

• Choose a test automation tool that supports your application's technology stack.

• Write test cases in the tool's scripting language or record them using the tool's recorder.

• Execute the test cases using the tool's runner or integration with a continuous integration tool.

• View the test results and debug failures as needed.

Group anagrams together in an array of strings.

• Create a hashmap to store sorted strings as keys and corresponding anagrams as values.

• Iterate through the input array, sort each string, and add it to the hashmap.

• Return the values of the hashmap as the grouped anagrams.

I have extensive experience in automation testing and have also taken courses in AI and machine learning.

• I have worked on creating automation frameworks using tools like Selenium and Appium.

• I have taken online courses on AI and machine learning to enhance my skills in these areas.

• I have implemented AI-based testing techniques like neural networks for test automation.

Arrange the numbers on two dice to show the calendar dates

• Assign the numbers 0-9 to each dot on the dice

• Use one die to represent the tens digit and the other for the ones digit

• For example, 1st of January can be represented as 01 on the dice

To find the selected option text from a dropdown in Selenium, you can use the getFirstSelectedOption() method.

• Use the Select class to work with dropdown elements in Selenium

• Use the getFirstSelectedOption() method to get the selected option

• Retrieve the text of the selected option using getText() method

To switch to a frame in Selenium, use driver.switchTo().frame() method. To come out of a frame, use driver.switchTo().defaultContent() method.

• Use driver.switchTo().frame() method to switch to a frame

• Use driver.switchTo().defaultContent() method to come out of a frame

• Example: driver.switchTo().frame("frameName");

• Example: driver.switchTo().defaultContent();

Find duplicates in a dropdown along with their occurrence/frequency.

• Iterate through the dropdown options and store each option in a hashmap with its frequency.

• Identify options with frequency greater than 1 as duplicates.

• Return the duplicates along with their occurrence/frequency.

Automate feature to read and modify parent and child nodes

• Use a scripting language like Python to automate the process

• Identify parent nodes and their corresponding child nodes

• Implement functions to read and modify node names

• Utilize libraries like Selenium for web automation if nodes are on a webpage