50+ Sdet (Software Development Engineer in Test) Interview Questions and Answers

Values can be sent without using sendkeys method by directly manipulating the DOM or using JavaScriptExecutor.

• Use JavaScriptExecutor to execute JavaScript code to set values of input fields.

• Find the element using appropriate locators and then use JavaScriptExecutor to set the value.

• Example: driver.executeScript("document.getElementById('elementId').value='text'");

requestSpecification is a class in RestAssured library used to define the request details for API testing.

• It is used to set the base URI, path, headers, query parameters, etc. for the API request.

• It allows customization of the request before sending it.

• Serialization is the process of converting an object into a format that can be stored or transmitted.

• In API testing, serialization is used to convert Java objects into JSON or XML format for API request or response.

• To achieve s...read more

Common exceptions in Selenium automation include NoSuchElementException, TimeoutException, and StaleElementReferenceException.

• NoSuchElementException occurs when an element cannot be found in the DOM.

• TimeoutException occurs when a command takes longer than the timeout value to complete.

• StaleElementReferenceException occurs when an element is no longer attached to the DOM.

• Other exceptions include ElementNotVisibleException, ElementNotSelectableException, and WebDriverException.

To post a value in a server, you need to consider the endpoint, request method, headers, body, and authentication.

• Identify the endpoint where the value needs to be posted

• Choose the appropriate request method (e.g., POST)

• Set the necessary headers (e.g., Content-Type)

• Construct the body payload with the value to be posted

• Handle authentication if required (e.g., API key, token)

Rest-assured is a Java-based library used for testing RESTful APIs.

• Rest-assured simplifies the testing of RESTful APIs by providing a domain-specific language (DSL) for writing tests.

• To handle certificate issues in rest-assured, we can use the relaxedHTTPSValidation() method to bypass SSL certificate validation.

• We can also import the certificate into the truststore and use it for SSL validation.

To ensure file transfer without corruption, use checksums, error detection codes, and data validation techniques.

• Calculate and compare checksums before and after transfer

• Use error detection codes like CRC or MD5

• Implement data validation techniques like parity checks or hash functions

• Verify file integrity using digital signatures or secure hash algorithms

Find triplet in an array to sum up to a given number.

• Sort the array in ascending order.

• Iterate through the array and fix the first element.

• Use two pointers approach to find the other two elements that sum up to the given number.

The windowHandles method returns a set of window handles as a set of strings.

• The windowHandles method is used to retrieve all the window handles of the current session.

• The return type is set because it ensures that each window handle is unique and there are no duplicates.

• The set data structure allows for efficient retrieval and manipulation of window handles.

• Example: Set<String> handles = driver.getWindowHandles();

I faced arrayIndexOutOfBoundary exception while accessing an array element beyond its size.

• The exception occurred when trying to access an array element at an index greater than or equal to its size.

• To fix it, I checked the array size before accessing its elements.

• I also made sure to properly initialize the array with the correct size.

• Example: String[] arr = new String[5]; arr[5] = "hello"; // throws exception

Coding questions related to string manipulation, array sorting, and finding indices and equilibrium point.

• To remove duplicate characters from a string, use a hash set to keep track of seen characters and remove duplicates.

• To sort an array, use built-in sorting functions or implement a sorting algorithm like quicksort or mergesort.

• To find the indices of resulting sum, use a hash map to store the complement of each element and check if it exists in the map.

• To find the equilibri...read more

Discuss with the developer and provide evidence to support the bug report.

• Communicate with the developer to understand their perspective

• Provide evidence to support the bug report

• Collaborate with the developer to find a solution

• If necessary, escalate the issue to a higher authority

Function to determine winner of IPL tournament with n teams following given rules.

• Create a matrix to store the results of each match played between teams

• Calculate the total points of each team based on the results of their matches

• Sort the teams based on their total points and select the top four teams

• Determine the winners of the playoffs based on the given rules

• Return the winner of the tournament

• Example: input n=6, output 'Team X'

Failed test cases can be rerun in TestNG using the 'rerun-failed.xml' file.

• Create a new XML file named 'rerun-failed.xml'

• Add the failed test cases to the XML file using the 'include' tag

• Run the 'rerun-failed.xml' file using TestNG

Jenkins is an open-source automation server that helps to automate parts of the software development process.

• Jenkins is used for continuous integration and continuous delivery (CI/CD) of software projects.

• It can be integrated with Git to create a pipeline for building, testing, and deploying code.

• The Git pipeline in Jenkins involves creating a Jenkinsfile that defines the stages of the pipeline, such as checkout, build, test, and deploy.

• Jenkins can also be used to automate ta...read more

Filter files ending with amazon.txt in Unix shell

• Use the 'ls' command to list all files in the directory

• Use the 'grep' command to filter files ending with 'amazon.txt'

• Combine the two commands using a pipe '|' symbol

Test cases can be prioritized in TestNG using priority attribute.

• Add priority attribute to @Test annotation

• Test cases with lower priority value will be executed first

• Priority can be any integer value, default is 0

Find common sub-strings in two strings and print them in alphabetical order.

• Use a nested loop to compare each character of both strings.

• Store common sub-strings in an array.

• Sort the array in alphabetical order.

• Print the sorted array.

Sort the array and check frequency of numbers not exceeding array length.

• Sort the array to arrange numbers in ascending order.

• Count the frequency of each number using a hash map or dictionary.

• Ensure that no number exceeds the length of the array.

• Example: For array [3, 1, 2, 2], sorted is [1, 2, 2, 3]. Frequencies: 1->1, 2->2, 3->1.

• If any number is greater than the array length, return false.

Abstract class is a class that cannot be instantiated and Interface is a blueprint of a class.

• Abstract class can have both abstract and non-abstract methods while Interface can only have abstract methods.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract class can have constructors while Interface cannot.

• Abstract class can have instance variables while Interface cannot.

• Abstract class is used for code reusability while Interface is ...read more

SQL query to get second largest salary of an employee from employee table

• Use ORDER BY and LIMIT to get the second highest salary

• SELECT MAX(salary) FROM employee WHERE salary < (SELECT MAX(salary) FROM employee)

• Use subquery to get the highest salary and then exclude it to get the second highest salary

Parallel testing can be achieved by dividing test cases into smaller chunks and running them simultaneously on multiple machines.

• Divide test cases into smaller chunks

• Use a test framework that supports parallel testing

• Run tests on multiple machines or virtual machines

• Ensure tests do not interfere with each other

• Aggregate test results from all machines

HTTP is a protocol for transmitting data over the internet, while HTTPS is a secure version of HTTP that encrypts the data.

• HTTP stands for Hypertext Transfer Protocol, while HTTPS stands for Hypertext Transfer Protocol Secure.

• HTTP operates on port 80, while HTTPS operates on port 443.

• HTTP is not secure and data is transmitted in plain text, while HTTPS uses SSL/TLS encryption to secure the data transmission.

• HTTPS is commonly used for secure transactions, such as online bankin...read more

SQL query to find aggregate salary for a division

• Use the GROUP BY clause to group the employees by division

• Use the SUM function to calculate the total salary for each division

• Include the division column in the SELECT statement

• Example: SELECT division, SUM(salary) AS total_salary FROM employees GROUP BY division

List of test scenarios for mobile app release

• Functional testing of all features

• Usability testing for ease of use

• Compatibility testing on different devices and OS versions

• Performance testing for speed and responsiveness

• Security testing for data protection

• Localization testing for language and cultural differences

• Regression testing to ensure no new bugs introduced

• Accessibility testing for users with disabilities

Reverse a linked list and find all possible subsequences in a given array.

• To reverse a linked list, iterate through the list and change the next pointers of each node to the previous node.

• To find all possible subsequences in an array, use recursion and generate all possible combinations of elements.

• For example, given the array [1, 2, 3], the possible subsequences are [], [1], [2], [3], [1, 2], [1, 3], [2, 3], [1, 2, 3].

Git flow is a branching model for software development.

• Git flow consists of two main branches: master and develop.

• Feature branches are created off of develop and merged back into it.

• Release branches are created off of develop for preparing a new release.

• Hotfix branches are created off of master to fix critical issues in production.

• Git flow helps to maintain a structured and organized workflow for development.

• Example: git flow init, git flow feature start , git flow release st...read more

Finding sub sudoko in a multi-dimensional integer array.

• Iterate through each row and column to find sub-sudoku

• Check if each sub-grid contains all numbers from 1 to 9

• If yes, then it is a sub-sudoku

• If no, then move to the next sub-grid