200+ Sdet Automation Test Engineer Interview Questions and Answers

To wait in Selenium, we can use explicit and implicit waits. To find all links in a page using XPath, we can use the findElements() method.

• To wait in Selenium, we can use explicit wait with ExpectedConditions or implicit wait with the setScriptTimeout() method.

• Explicit wait waits for a certain condition to occur before proceeding with the next steps.

• Implicit wait sets a maximum time for the driver to wait for an element to appear.

• To find all links in a page using XPath, we ca...read more

Page Object Model (POM) is a design pattern used in test automation to create an object repository for web UI elements.

• POM helps in creating reusable and maintainable code by separating the test logic from the page-specific details.

• Each web page is represented as a separate class, and the UI elements and their actions are defined as methods within that class.

• POM improves code readability, reduces code duplication, and enhances test maintenance.

• TestNG annotations are used in T...read more

To handle alerts in Selenium, we use the Alert interface and its methods.

• To switch to an alert, we use the switchTo() method of WebDriver class.

• To accept or dismiss an alert, we use the accept() or dismiss() method of Alert interface.

• To get the text of an alert, we use the getText() method of Alert interface.

• To send text to an alert, we use the sendKeys() method of Alert interface.

To take a screenshot in automation testing, use the built-in methods provided by the testing framework.

• In Selenium, use the getScreenshotAs() method to capture a screenshot.

• In Appium, use the getScreenshotAs() method to capture a screenshot.

• In TestNG, use the ITestResult interface to capture a screenshot on test failure.

• In Cucumber, use the After hook to capture a screenshot after each scenario.

Using multiple catch blocks allows handling different types of exceptions separately, while finally block ensures cleanup code is executed regardless of exception.

• Multiple catch blocks can handle different types of exceptions separately

• Finally block ensures cleanup code is executed regardless of exception

• Example: try { // code that may throw exceptions } catch (ExceptionType1 e) { // handle ExceptionType1 } catch (ExceptionType2 e) { // handle ExceptionType2 } finally { // cl...read more

Find maximum sum of substring and merge two arrays without extra space.

• Use Kadane's algorithm to find maximum sum of substring in an array.

• To merge two arrays without extra space, use two pointers approach.

• Example: Input arrays [1, 2, -3, 4, 5] and [6, 7, 8], output merged array [1, 2, -3, 4, 5, 6, 7, 8].

There are 8 locators present in Selenium.

• Selenium provides 8 different locators to identify elements on a web page.

• The locators are: ID, Name, Class Name, Tag Name, Link Text, Partial Link Text, CSS Selector, and XPath.

• Each locator has its own syntax and usage.

• For example, to locate an element by ID, you can use driver.findElement(By.id("elementId"));

Troubleshooting server connection issues involves checking network, application, and server configurations systematically.

• Check network connectivity using 'ping' to see if the server is reachable.

• Use 'telnet' or 'nc' to test if the specific application port is open.

• Examine firewall settings to ensure they allow traffic on the required ports.

• Review server logs for any error messages that might indicate issues.

• Verify application status using commands like 'systemctl status <ser...read more

Docker is a containerization platform, API status codes indicate the success or failure of a request, deployment processes involve releasing software updates, and Jenkins is a continuous integration tool.

• Docker is a platform for developing, shipping, and running applications in containers.

• API status codes are used to indicate the success or failure of a request, such as 200 for success and 404 for not found.

• Deployment processes involve releasing software updates to production...read more

Use regular expressions to remove special characters from a string.

• Create a regular expression pattern to match special characters

• Use the replace() method with the regular expression pattern to remove special characters

• Example: str.replace(/[!@#$%^&*()_+]/g, '') will remove !@#$%^&*()_+ from the string

To find broken links, use a link checker tool or browser extension.

• Use a link checker tool like Xenu's Link Sleuth or W3C Link Checker

• Install a browser extension like Check My Links for Chrome or Link Checker for Firefox

• Manually check links by clicking on them and checking for error messages

• Regularly check for broken links to ensure website functionality

Example of a login scenario in Cucumber with parameters for username and password

• Create a feature file with the login scenario

• Define the scenario outline with placeholders for username and password

• Implement step definitions to pass the parameters in the login steps

Yes, I can write a program that outputs a sentence in reverse.

• Create a function that takes a string as input

• Split the string into an array of words

• Reverse the array

• Join the array back into a string and return

To verify if a record is deleted from a page with 10 records, we can check if the record is no longer displayed.

• Locate the record on the page

• Verify that the record is no longer visible

• Confirm that the total number of records displayed is now 9

Dynamic elements in Selenium are handled using techniques like explicit waits, fluent waits, and dynamic locators.

• Use explicit waits to wait for a specific condition to be met before interacting with the element

• Use fluent waits to wait for an element to be present and visible before interacting with it

• Use dynamic locators like XPath with functions to locate elements that change dynamically

Answering questions on framework, string reversal, checkbox selection without third variable and swipe no.

• Working on a hybrid framework with Selenium and Appium for web and mobile automation

• String reversal can be done using built-in functions or by iterating through the string

• Checkbox selection can be checked using isSelected() method in Selenium

• Swipe no. can be achieved using TouchActions class in Appium

• All of these can be implemented without using a third variable

Binary Search Trees (BST) enable efficient data storage and retrieval through a hierarchical structure, optimizing search operations.

• A BST is a binary tree where each node has at most two children.

• For any given node, all values in the left subtree are less, and all values in the right subtree are greater.

• Searching for a value in a BST has an average time complexity of O(log n).

• Insertion and deletion operations also maintain the BST properties, ensuring efficient updates.

• Examp...read more

Remove letter e from a sentence

• Iterate through each character in the sentence

• If the character is not 'e', add it to a new string

• Return the new string without 'e'

To find duplicate characters in a string, we can use various methods like hashing or counting occurrences using data structures.

• Using a Hash Map: Iterate through the string, storing each character's count in a hash map. Example: 'hello' -> {'h': 1, 'e': 1, 'l': 2, 'o': 1}.

• Using a Set: Track seen characters in a set. If a character is already in the set, it's a duplicate. Example: 'banana' -> duplicates are 'a' and 'n'.

• Sorting the String: Sort the string and check adjacent cha...read more

Emulator replicates both hardware and software of the original device, while simulator only replicates the software.

• Emulator replicates both hardware and software of the original device

• Simulator only replicates the software

• Emulator is slower but more accurate, simulator is faster but less accurate

• Examples: Android Emulator for testing mobile apps, Flight Simulator for pilot training

String Buffer is synchronized and thread-safe, while String Builder is not synchronized and faster.

• String Buffer is synchronized, making it thread-safe for use in multi-threaded environments.

• String Builder is not synchronized, making it faster but not thread-safe.

• String Buffer is slower than String Builder due to synchronization overhead.

• Use String Buffer when thread safety is needed, and String Builder for better performance.

Agile methodologies are integrated into day to day operations for efficient software development.

• Agile methodologies promote collaboration and flexibility in development

• Daily stand-up meetings keep the team updated on progress and any roadblocks

• Sprints allow for focused development and frequent feedback

• Continuous integration and testing ensure quality and catch issues early

• Retrospectives provide opportunities for reflection and improvement

To update a name in a database, you can use SQL UPDATE statement with the appropriate WHERE clause.

• Use SQL UPDATE statement with SET clause to specify the new name

• Add a WHERE clause to specify the record to be updated based on a unique identifier

• Ensure proper permissions to update the database

• Example: UPDATE table_name SET name = 'new_name' WHERE id = 123

Remove special characters and replace with space, then reverse each word in a string.

• Use regex to remove special characters and replace with space

• Split the string into words and reverse each word individually

• Join the reversed words back together to form the final string

Unit testing is a software testing method where individual units or components of a software are tested in isolation.

• Unit testing is typically done by developers to ensure that each unit of code functions correctly on its own.

• It helps in identifying bugs early in the development process.

• Unit tests are automated and focus on testing small, specific parts of the code.

• Examples of unit testing frameworks include JUnit for Java, NUnit for .NET, and pytest for Python.

Method overloading is when multiple methods have the same name but different parameters, while method overriding is when a subclass provides a specific implementation of a method that is already provided by its superclass.

• Method overloading involves creating multiple methods in the same class with the same name but different parameters.

• Method overriding occurs when a subclass provides a specific implementation of a method that is already provided by its superclass.

• Method over...read more

A framework is a structured platform for developing and executing automated tests, enhancing efficiency and maintainability.

• Modularity: Allows separation of test scripts into reusable components (e.g., Page Object Model).

• Test Management: Provides tools for organizing and managing test cases (e.g., TestNG, JUnit).

• Reporting: Generates detailed reports on test execution results (e.g., Allure, ExtentReports).

• Configuration: Supports external configuration files for easy environmen...read more