TestVagrant Sdet Interview Questions and Answers

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...read more

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.

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 blo...read more

Waits in Selenium are used to synchronize tests with the browser's state.

• Waits help to handle synchronization issues in Selenium tests

• There are two types of waits in Selenium - Implicit Wait and Explicit Wait

• Implicit Wait sets a default waiting time for the entire test script

• Explicit Wait allows the test to wait for a certain condition to be met before proceeding

Using dynamic programming to check if a string is a palindrome.

• Create a 2D array to store the results of subproblems

• Iterate through the string and fill the array based on whether substrings are palindromes

• Check the array to determine if the entire string is a palindrome

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)

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