100+ Sdet Interview Questions and Answers

API authentication can be done using various methods like API keys, OAuth tokens, and JWT tokens.

• Use API keys to authenticate requests by including the key in the request header.

• Implement OAuth for secure authorization and authentication.

• Utilize JWT tokens for stateless authentication by generating tokens upon successful login.

TestNG tags can pass data using parameters in testng.xml file or through DataProviders.

• Use parameters in testng.xml file to pass data to test methods

• Use DataProviders to pass data dynamically to test methods

• Example:

Program to move all zeros in an array to the end

• Iterate through the array and move all zeros to the end

• Use two pointers approach to swap non-zero elements with zeros

• Maintain a count of non-zero elements to determine the swap position

Find the second highest repeated integer in a list.

• Iterate through the list and count the frequency of each integer.

• Sort the frequencies in descending order and return the second highest frequency.

• Handle edge cases like when there is no second highest frequency.

Use Selenium to extract values from a dynamic table

• Identify the table using its locator (id, class, xpath, etc.)

• Iterate through the rows and columns of the table to extract values

• Use Selenium commands like findElements and getText to retrieve the values

• Handle dynamic content by waiting for elements to be present or visible

UI test cases for a Form

• Verify all required fields are displayed

• Test validation messages for invalid inputs

• Check if form submission is successful

• Test the functionality of reset button

var is function scoped, let is block scoped in JavaScript.

• var is function scoped, let is block scoped

• var can be redeclared, let cannot be redeclared

• let is recommended for use over var in modern JavaScript

Swap two numbers without using a third integer

• Use XOR operation to swap two numbers without using a third integer

• Example: a = 5, b = 7. a = a XOR b, b = a XOR b, a = a XOR b

• After swapping: a = 7, b = 5

Find the first and last occurrence of a specific element in an array of strings.

• Iterate through the array and keep track of the index of the first and last occurrence of the element.

• Return the index of the first and last occurrence of the element.

String programs to reverse and duplicate an array of strings.

• Use a loop to iterate through each string in the array.

• To reverse a string, use the built-in reverse() method or loop through the string backwards.

• To duplicate a string, use the concat() method or the + operator.

• Remember to store the reversed or duplicated string in a new variable or array.

I have worked on tools such as Selenium, JUnit, TestNG, Postman, and Jenkins.

• Selenium

• JUnit

• TestNG

• Postman

• Jenkins

Test cases for payment scenario

• Verify payment is processed successfully with valid credit card information

• Test payment failure with invalid credit card details

• Check if payment confirmation email is sent to the user

• Test payment timeout scenario

• Verify payment receipt is generated after successful transaction

I want to join Autodesk because of its innovative technology and global impact in the design industry.

• Autodesk is a leader in providing cutting-edge software solutions for design and engineering professionals

• I am excited about the opportunity to work on challenging projects and contribute to the company's success

• I admire Autodesk's commitment to sustainability and diversity in the workplace

Var is used to declare implicitly typed local variables, while Ref is used for passing arguments by reference.

• Var keyword allows the compiler to infer the type of the variable based on the assigned value.

• Ref keyword is used to pass arguments by reference, allowing the called method to modify the original value.

• Var example: var number = 10; // Compiler infers the type as int

• Ref example: void ModifyValue(ref int value) { value = 20; } // Changes the original value passed by ref...read more

I have worked on a keyword-driven automation framework using Selenium and TestNG.

• Utilized Excel sheets to store test cases and keywords

• Implemented reusable functions for common actions like clicking, inputting text, etc.

• Used TestNG for test case management and reporting

• Integrated with Jenkins for continuous integration

Automation framework is a set of guidelines, tools, and processes used to automate testing of software applications.

• Automation framework provides structure and guidelines for creating and executing automated tests.

• It helps in organizing test scripts, managing test data, and generating test reports.

• Examples of automation frameworks include Selenium, TestNG, and Cucumber.

• Frameworks can be data-driven, keyword-driven, or hybrid in nature.

Test cases for Login API

• Verify valid username and password login successfully

• Verify invalid username and password combination fails to login

• Verify login with empty username or password fails

• Verify login with special characters in username or password fails

Linked list code for tasks

• Create a linked list class

• Implement add, remove, and search methods

• Use the linked list to perform the tasks

Find missing numbers in an integer array

• Iterate through the array and keep track of seen numbers

• Compare the seen numbers with a range of expected numbers to find missing ones

• Handle edge cases like duplicates or negative numbers

• Example: Array [1, 2, 4, 6] should return missing numbers 3 and 5

Concatenate two strings without using any inbuilt function

• Create a new array to store the characters of both strings

• Iterate through each character of the first string and add it to the new array

• Repeat the same process for the second string

• Join the characters in the array to form the concatenated string

Snapdeal is a leading e-commerce platform in India, offering a wide range of products and services.

• Snapdeal has a vast product catalog, providing customers with a wide variety of options.

• The platform offers competitive prices and frequent discounts, making it attractive for customers.

• Snapdeal has a user-friendly interface and a seamless shopping experience.

• The company has a strong logistics network, ensuring timely delivery of products.

• Snapdeal has a robust customer support s...read more

Reverse a number using inheritance vs interface

• Inheritance involves creating a new class that inherits properties and methods from an existing class, while interface defines a contract that a class must implement.

• In the context of reversing a number, inheritance could be used to create a base class with a method for reversing numbers, which can be inherited by other classes.

• Interface could be used to define a common method signature for reversing numbers that different classe...read more

Patch and post are HTTP methods used in API testing to update and create resources, respectively.

• PATCH method is used to update an existing resource in the API

• POST method is used to create a new resource in the API

• Both methods are commonly used in RESTful APIs for CRUD operations

• Example: PATCH /api/users/123 to update user with ID 123

• Example: POST /api/users to create a new user

Regression testing is the process of re-running previously executed tests to ensure that new code changes have not adversely affected existing functionality.

• Regression testing is performed to verify that new code changes have not introduced any new bugs or issues.

• It involves re-running previously executed test cases to ensure that existing functionality still works as expected.

• Regression testing is typically automated to save time and effort.

• Examples of regression testing too...read more

XPath is a way to locate elements on a web page using their HTML structure.

• Use Chrome DevTools to inspect elements and generate XPath

• Avoid using absolute XPath as it can be brittle

• Use relative XPath with unique attributes for better stability

Regression testing ensures existing functionality still works after changes, while sanity testing checks if new functionality works as expected.

• Regression testing is performed to make sure that new code changes do not adversely affect existing functionality.

• Sanity testing is a cursory testing to make sure that the new functionality is working as expected.

• Regression testing is usually automated and covers a wide range of test cases.

• Sanity testing is usually done manually and f...read more

Java Stream is a sequence of elements that supports functional-style operations.

• Java Stream is used to process collections of objects in a functional way.

• It allows for operations like filter, map, reduce, and collect to be performed on the elements.

• Streams can be sequential or parallel, providing better performance for large datasets.

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); Stream stream = names.stream();

Check if a string is a palindrome or not

• Iterate through the string from both ends and compare characters

• Ignore spaces and punctuation when checking for palindrome

• Use built-in functions like reverse() to check for palindrome

final, finally, and finalize are keywords in Java with different meanings.

• final is a keyword used to declare a constant value that cannot be modified

• finally is a block used in exception handling to ensure a piece of code is always executed

• finalize is a method in the Object class used for garbage collection before an object is destroyed

STLC stands for Software Testing Life Cycle, which is a series of steps performed in a specific sequence to ensure the quality of software.

• STLC is a process followed by software testers to ensure that the software meets quality standards.

• It includes phases like requirement analysis, test planning, test design, test execution, and test closure.

• Bug lifecycle refers to the stages a bug goes through from discovery to resolution, including reporting, triaging, fixing, retesting, a...read more

Program to calculate the sum of digits in a number

• Iterate through each digit of the number and add them together

• Use modulus operator to extract each digit

• Convert the number to a string to easily access individual digits

My bug process involves thorough testing, documenting, prioritizing, and tracking bugs to resolution.

• I start by thoroughly testing the software to identify bugs.

• I document each bug with detailed steps to reproduce, screenshots, and any relevant information.

• I prioritize bugs based on severity and impact on users.

• I track bugs through a bug tracking system, regularly updating their status and working towards resolution.

My automation framework is a data-driven framework using Selenium WebDriver and TestNG for test execution and reporting.

• Uses Selenium WebDriver for interacting with web elements

• Utilizes TestNG for test execution and reporting

• Follows a data-driven approach for test data management

Pointers are variables that store memory addresses of other variables. Double pointers store memory addresses of pointers.

• Pointers are used to access and manipulate memory addresses of variables.

• Double pointers are used to store memory addresses of pointers themselves, allowing for indirect access to variables.

• Example: char *ptr; int **dptr;

Checked exceptions are checked at compile time, while unchecked exceptions are not.

• Checked exceptions must be either caught or declared in the method signature using 'throws' keyword.

• Unchecked exceptions do not need to be explicitly handled.

• Examples of checked exceptions include IOException, ClassNotFoundException.

• Examples of unchecked exceptions include NullPointerException, ArrayIndexOutOfBoundsException.

Selenium is an open-source automation testing framework used for web applications.

• Selenium supports multiple programming languages like Java, Python, C#, etc.

• It consists of Selenium WebDriver, Selenium IDE, and Selenium Grid.

• Selenium WebDriver is used for automating web applications by interacting with the web elements.

• Selenium IDE is a record and playback tool for creating test cases.

• Selenium Grid is used for parallel testing across different browsers and environments.

Implement a parenthesis balancing algorithm using a stack

• Use a stack to keep track of opening parentheses

• When encountering a closing parenthesis, pop from stack and check if it matches the closing parenthesis

• If stack is empty or mismatched parentheses, return false

• If all parentheses are balanced, return true

Reverse string without using loop

• Use recursion to reverse the string

• Base case: if string length is 0 or 1, return the string

• Recursive case: return the last character + reverse(rest of the string)

Find the smallest number in an array of strings

• Convert the strings to numbers before comparing

• Use a loop to iterate through the array and keep track of the smallest number

• Handle cases where the array is empty or contains non-numeric strings

• Example: ['5', '10', '2', '8'] should return '2'

Merging two sorted arrays into a single sorted array

• Create a new array to store the merged result

• Iterate through both arrays simultaneously, comparing elements and adding the smaller one to the result array

• Handle cases where one array is longer than the other by appending the remaining elements

Implement a queue using two stacks

• Use two stacks - one for enqueue operation and one for dequeue operation

• For enqueue operation, push elements into the first stack

• For dequeue operation, if the second stack is empty, pop all elements from the first stack and push into the second stack, then pop from the second stack

• Example: Enqueue 1,2,3 -> Stack1: [1,2,3], Dequeue -> Stack2: [3,2,1], Dequeue -> 1

AWS SQS (Simple Queue Service) is a fully managed message queuing service that enables decoupling of components in a distributed system.

• Used for storing messages in a queue before they are processed by a consumer

• Supports distributed systems by enabling asynchronous communication between components

• Helps in decoupling different parts of a system, improving scalability and fault tolerance

• Messages can be stored in SQS for up to 14 days before being processed

Exceptions in Selenium are errors that occur during test execution, such as ElementNotVisibleException or TimeoutException.

• Selenium WebDriver throws exceptions when it encounters errors during test execution.

• Common exceptions include NoSuchElementException, ElementNotVisibleException, TimeoutException, StaleElementReferenceException, and WebDriverException.

• Handling exceptions in Selenium can be done using try-catch blocks or using TestNG annotations like @Test(expectedExcepti...read more

Expected CTC is the anticipated salary package for the position.

• Research industry standards for SDET roles

• Consider your experience, skills, and location when negotiating CTC

• Be prepared to discuss salary expectations during the interview process

I have extensive experience in API testing, including designing test cases, executing tests, and analyzing results.

• Experience in testing RESTful APIs using tools like Postman or SoapUI

• Ability to write automated tests using frameworks like Selenium or JUnit

• Understanding of API documentation and ability to create test plans based on it

Hashmap and Hashset are data structures used in Java to store key-value pairs and unique elements respectively.

• Hashmap is used to store key-value pairs where keys are unique and values can be duplicated.

• Hashset is used to store unique elements only, no duplicates are allowed.

• Hashmap uses hashing to store and retrieve elements efficiently.

• Hashset internally uses Hashmap to store elements as keys with a dummy value.

Test cases for search option functionality

• Verify search results are displayed correctly

• Test search with different input types (text, numbers, special characters)

• Check search functionality with empty input

• Test search with long input strings

• Verify search results are sorted correctly