Celebal Technologies Senior Sdet Test Engineer Interview Questions and Answers

2 Coding questions - medium to hard

Q1. Questions on scalable systems.
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Q2. Medium level DSA questions.
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Q1. Questions on SQL
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Q2. Implement LFU using OOPs concepts from scratch.
Ans. 
Implement LFU cache using OOPs concepts
• Create a class for LFU cache with methods like get, put, and remove

• Use a hashmap to store key-value pairs and a hashmap to store frequency of each key

• Implement a doubly linked list to store keys with the same frequency
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Q1. Mainly related to JAVA programming
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Q2. Selenium project reviews
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Q1. Reverse the string
Ans. 
Reverse a given string
• Create a new empty string to store the reversed string

• Iterate through the original string from end to start and append each character to the new string

• Return the reversed string
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Q2. Scenario based questions
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Q1. Git workflow and xpath. Reverse a string
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Frequency array, java collection, missing number

Q1. What is React Context?
Ans. 
React Context is a feature in React that allows data to be passed down the component tree without having to pass props manually.
• Context provides a way to share values like themes, user data, etc. across the component tree.

• It avoids prop drilling, where props are passed down multiple levels to reach a component that needs them.

• Context consists of two parts: a Provider component that provides the data and a Consumer comp...read more
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Q2. What is meant by closure in javascript?
Ans. 
Closure is a function that has access to its parent scope, even after the parent function has closed.
• Closure is created when a function is defined inside another function.

• The inner function has access to the outer function's variables and parameters.

• The outer function returns the inner function, which can be called later with the parent scope still accessible.

• Closures are used for data privacy, event handlers, and call
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Q3. What are the complicated tasks you've done exceeding everyone's expectation?
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Q4. Algorithm to convert roman numeral to numbers?
Ans. 
Algorithm to convert roman numeral to numbers
• Create a dictionary to map roman numerals to their corresponding values

• Iterate through the roman numeral string from right to left

• If the current value is less than the previous value, subtract it from the total

• If the current value is greater than or equal to the previous value, add it to the total

• Return the total
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Q1. What is React context?
Ans. 
React context is a way to pass data through the component tree without having to pass props down manually at every level.
• Context provides a way to share values like a theme or user data across the component tree.

• It avoids prop drilling and makes the code cleaner and more maintainable.

• Context consists of two parts: a Provider component that provides the data and a Consumer component that consumes the data.

• Context can be...read more
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Q2. What is abstract class in javascript?
Ans. 
There is no abstract class in JavaScript.
• JavaScript does not have a built-in abstract class concept.

• However, it is possible to create abstract classes using functions and prototypes.

• Abstract classes are used as blueprints for other classes to inherit from.

• They cannot be instantiated on their own and must be extended by a subclass.

• Abstract methods can be defined in the abstract class and must be implemented in the subcl
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Q3. What is meant by function overloading and function overriding?
Ans. 
Function overloading is when multiple functions have the same name but different parameters. Function overriding is when a subclass provides its own implementation of a method that is already present in the parent class.
• Function overloading is used to provide multiple ways to call a function with different parameters.

• Function overriding is used to provide a specific implementation of a method in a subclass.

• Function ove...read more
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Q4. Implement counter in react app
Ans. 
Implement a counter in a React app
• Create a state variable to hold the count

• Render the count in the UI

• Add buttons to increment and decrement the count

• Update the state variable on button click
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Q1. Why strings are immutable
Ans. 
Strings are immutable to ensure data integrity and prevent unintended changes.
• Immutable strings allow for safer multithreading and concurrency.

• String interning is possible because of immutability.

• Immutable strings can be used as keys in dictionaries and hash tables.

• Examples of immutable data types include numbers and tuples.
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Q1. LOCATE X PATH , GET WINDOW HANDLE
Ans. 
Locate element using Xpath and retrieve window handle in automation testing.
• Use findElement method with By.xpath to locate the element using Xpath.

• Use getWindowHandle method to retrieve the window handle.
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Q2. TYPES OF WAITS WITH THEIR SYNTAX
Ans. 
Types of waits in automation testing with their syntax
• Implicit Wait: driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

• Explicit Wait: WebDriverWait wait = new WebDriverWait(driver, 10); wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("elementID")));

• Fluent Wait: Wait wait = new FluentWait(driver).withTimeout(Duration.ofSeconds(10)).pollingEvery(Duration.ofSeconds(2)).ignoring(NoSuchElementEx
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Q1. Performance Testing
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Q2. Difference between put and patch
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