Quality Engineering Lead Interview Questions and Answers

I perform ETL testing to ensure data is extracted, transformed, and loaded accurately in the project.

• Verify data extraction from source systems

• Check data transformation logic and accuracy

• Validate data loading into target systems

• Ensure data integrity and consistency throughout the ETL process

Use a link checker tool or write a script to scan the webpage for broken links

• Use a link checker tool like W3C Link Checker or Dead Link Checker

• Write a script using programming languages like Python or JavaScript to scan the webpage for broken links

• Check for HTTP status codes like 404 (Not Found) or 500 (Internal Server Error) to identify broken links

StaleElementReferenceException occurs when an element is no longer attached to the DOM.

• Handle by re-locating the element before interacting with it

• Use try-catch block to catch the exception and retry the operation

• Avoid storing elements in variables for a long time

Primary key uniquely identifies each record in a table, while foreign key establishes a link between two tables.

• Primary key ensures data integrity by enforcing uniqueness of each record

• Foreign key establishes a relationship between tables by referencing the primary key of another table

• Example: In a database of students and courses, student ID can be a primary key in the students table and a foreign key in the courses table

There are two types of XPath: Absolute and Relative. Absolute XPath starts from the root node, while Relative XPath starts from any node.

• Absolute XPath starts with a single forward slash (/) and is used to select nodes starting from the root node.

• Relative XPath starts with a double forward slash (//) and is used to select nodes anywhere in the document.

• XPath can also use attributes to locate elements, such as //input[@id='username'] to select an input element with id 'usernam...read more

ETL testing is the process of validating and verifying data extraction, transformation, and loading processes in a data warehouse or data integration system.

• ETL testing ensures data is accurately extracted from source systems

• It checks data transformation rules are applied correctly

• It verifies data is loaded into the target system without loss or corruption

• Common ETL testing techniques include data completeness, data quality, and performance testing

ArrayList is a resizable array implementation while HashSet is a collection of unique elements with no duplicates.

• ArrayList allows duplicate elements and maintains insertion order.

• HashSet does not allow duplicate elements and does not maintain insertion order.

• ArrayList uses an index to access elements while HashSet uses hashing for fast retrieval.

• Example: ArrayList list = new ArrayList<>(); HashSet set = new HashSet<>();

• Example: list.add("apple"); set.add("apple");