Klaus IT Solutions Softwaretest Engineer Interview Questions and Answers

Q1. Whats is Denpendency injection?
Ans. 
Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Allows for easier testing by injecting mock dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Examples: Constructor injection, Setter injection, Interface injection
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Q2. What is middleware
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Middleware is software that acts as a bridge between different applications, allowing them to communicate and share data.
• Middleware facilitates communication between different software applications

• It can handle tasks such as message queuing, data transformation, and security

• Examples of middleware include message brokers like RabbitMQ, ESBs like MuleSoft, and API gateways like Kong
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Q1. What is Bug lifecycle
Ans. 
Bug lifecycle refers to the stages a bug goes through from discovery to resolution.
• Bug is identified by tester

• Bug is reported in bug tracking system

• Bug is assigned to developer for fixing

• Developer fixes the bug

• Bug is retested by tester

• Bug is closed if fixed or reopened if issue persists
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Q2. What is Api testing
Ans. 
API testing is a type of software testing that involves testing APIs directly to ensure they meet functionality, reliability, performance, and security requirements.
• API testing involves testing the functionality of APIs by sending requests and verifying responses.

• It also includes testing for reliability, performance, and security of APIs.

• API testing can be done manually or using automated tools like Postman or SoapUI.

• E...read more
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Q1. Explain regression testing
Ans. 
Regression testing is the process of retesting a software application to ensure that new code changes have not adversely affected existing functionality.
• Performed after code changes to ensure that existing functionality still works

• Helps in identifying any new bugs introduced by the changes

• Automated tools like Selenium can be used for regression testing

• Regression test suites are often created to streamline the process
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Q2. Explain high severity low priority bug
Ans. 
A high severity low priority bug is a software issue that has a significant impact on the system but can be deferred for fixing.
• High severity means the bug has a major impact on the system functionality or performance.

• Low priority indicates that the bug can be fixed at a later stage as it does not hinder the basic functionality.

• Examples: A spelling mistake in a less frequently used feature, a cosmetic issue in the user
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Java code , oops, sql , spring bbot

Q1. Maximum area of Stack
Ans. 
The maximum area of a stack is determined by the size of the stack and the items it can hold.
• The maximum area of a stack is calculated by multiplying the height of the stack by the width of the stack.

• For example, if a stack has a height of 10 units and a width of 5 units, the maximum area would be 50 square units.
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Q2. Length of longest substring
Ans. 
Find the length of the longest substring without repeating characters.
• Iterate through the string and keep track of the characters seen so far in a set.

• Use two pointers to mark the start and end of the current substring.

• Update the maximum length of the substring as you iterate through the string.
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Java string manipulation questions and reactjs

Q1. Asked question in-depth about Spring boot and java
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It was simple basic level questions

Q1. Asked basic codes
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Q1. Normal basic hr type questions
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Python code for array

Computerized test based on simpel math questions

Moderate Level questions were asked.

Medium level questions were asked.

Q1. Split array into specified size
Ans. 
Split an array of strings into specified size chunks
• Use a loop to iterate through the array and slice it into chunks of specified size

• Check if the array length is divisible by the specified size, if not handle the remaining elements separately

• Example: ['apple', 'banana', 'cherry', 'date'] split into chunks of size 2 would result in [['apple', 'banana'], ['cherry', 'date']]
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Q2. Flatten nested array
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Q3. Internal working of the hash map with custom object
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A hash map is a data structure that stores key-value pairs, using a hash function to map keys to indexes in an array.
• Hash map uses a hash function to determine the index of the key in the underlying array.

• Collision resolution techniques like chaining or open addressing are used to handle cases where multiple keys hash to the same index.

• Custom objects used as keys must override the hashCode() and equals() methods for pr
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Q4. SQL query to find the highest salary from a specific department
Ans. 
SQL query to find the highest salary from a specific department
• Use the MAX() function to find the highest salary

• Filter the results based on the specific department using WHERE clause

• Join the employee table with the department table if necessary
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Q1. Working of the hash set with the employee object

Ans. 

A hash set stores unique elements using a hash function for efficient retrieval.

• Hash set stores unique elements based on their hash code

• Employee object must have proper hashCode() and equals() methods implemented

• Example: HashSet employeeSet = new HashSet<>();

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