ZenQ Interview Questions and Answers

Assertions in Postman are validation points to ensure the expected response from an API

• Assertions in Postman are used to validate the response of an API request

• They help ensure that the response meets the expected criteria

• Common types of assertions include status code, response body content, response time, etc.

• Examples of assertions in Postman: checking if status code is 200, verifying specific data in response body

Important HTTP methods in Postman include GET, POST, PUT, PATCH, and DELETE.

• GET: Used to retrieve data from a server. Example: GET request to fetch user details.

• POST: Used to submit data to a server. Example: POST request to create a new user.

• PUT: Used to update data on a server. Example: PUT request to update existing user details.

• PATCH: Used to partially update data on a server. Example: PATCH request to update user's email address.

• DELETE: Used to delete data on a server. E...read more

Functional testing focuses on testing the functionality of the software, while non-functional testing focuses on testing the performance, usability, and other non-functional aspects.

• Functional testing ensures that the software functions as expected based on the requirements.

• Non-functional testing evaluates aspects such as performance, usability, reliability, and scalability.

• Examples of functional testing include unit testing, integration testing, and system testing.

• Examples o...read more

The seven principles of testing are guidelines that help testers in their testing activities.

• Testing shows the presence of defects, not their absence.

• Exhaustive testing is impossible.

• Early testing saves time and money.

• Defect clustering occurs.

• Pesticide paradox - if the same tests are repeated over and over, eventually the same set of test cases will no longer find any new bugs.

• Testing is context dependent.

• Absence-of-errors fallacy - finding and fixing defects does not help if...read more

Joins are used to combine data from two or more tables based on a related column.

• Joins are used in SQL to retrieve data from multiple tables.

• There are different types of joins such as inner join, left join, right join, and full outer join.

• Inner join returns only the matching rows from both tables.

• Left join returns all the rows from the left table and matching rows from the right table.

• Right join returns all the rows from the right table and matching rows from the left table.

• F...read more

A foreign key is a column or a set of columns in a table that refers to the primary key of another table.

• It establishes a link between two tables.

• It ensures referential integrity.

• It helps in maintaining consistency in the database.

• It can be null or have duplicate values.

• Example: A 'customer' table may have a foreign key 'order_id' that refers to the primary key 'id' in the 'order' table.