December 1, 2023

Preparing for a functional testing interview? We’ve got you covered! In this blog post, we have compiled a concise list of the top 70 functional testing interview questions and their brief yet comprehensive answers to help you succeed.

What is functional testing?

Functional testing validates the functionality of an application or system against specified requirements.

Name common functional testing techniques.

Black box testing, white box testing, grey box testing, boundary value analysis, equivalence partitioning, and decision table testing.

Difference between functional and non-functional testing.

Functional testing verifies expected behavior, while non-functional testing focuses on performance, security, reliability, and usability.

Key components of a test plan for functional testing.

Objectives, test strategy, test scope, test deliverables, test environment, test schedule, and resource allocation.

What is a test case?

A documented set of steps, conditions, and expected results is used to verify functionality.

Difference between a test case and a test scenario.

A test scenario is a high-level description, while a test case provides specific steps and data.

What is a test script?

Instructions that guide test case execution, including input data, expected results, and conditions.

What is a regression test?

Testing to ensure recent changes haven’t affected previously tested functionality.

What is equivalence partitioning?

A technique dividing the input into classes to reduce the number of test cases required.

Difference between positive and negative testing.

Positive testing validates expected behavior with valid inputs, while negative testing focuses on handling invalid or unexpected inputs.

What is a defect? How is it different from an error?

A defect is a flaw discovered during testing, while an error refers to a human action that produces an incorrect result.

Purpose of a defect tracking tool?

Record, monitor, and manage defects throughout the software development lifecycle.

Explain boundary value analysis.

Testing application behavior at input boundaries to identify potential issues.

What is smoke testing?

Quick and shallow testing to ensure critical functions work before in-depth testing.

Difference between verification and validation.

Verification ensures a product meets requirements, while validation determines if it satisfies intended use and customer needs.

Purpose of a traceability matrix in functional testing?

To map requirements to test cases and ensure coverage for analysis.

Difference between system testing and acceptance testing.

System testing validates the integrated system against requirements, while acceptance testing confirms it meets user needs and acceptance criteria.

What is a test plan?

A document outlining the scope, approach, resources, and schedule for testing activities.

Explain ad-hoc testing.

Informal testing is performed without any predefined test cases or plans.

What is usability testing?

Testing the ease of use and user-friendliness of an application or system.

Remember to prepare thoroughly and practice answering these questions confidently. Good luck with your functional testing interview!

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