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Top 64 Software Testing / TDD Interview Questions & Answers (2026)
64 Questions
34 Beginner
19 Intermediate
11 Advanced
About Software Testing / TDD
This technology is widely used in software development and is a frequent topic in technical interviews at companies of all sizes.
What to Expect in a Software Testing / TDD Interview
Interviews cover both foundational concepts and practical application of this technology, with questions ranging from definitions to architectural decision-making.
How to Use This Guide
Work through questions in order of difficulty to build your understanding progressively. Bookmark challenging questions and revisit them before your interview.
Curated by Tech Baithak Editorial Team · Last updated: May 2026
Beginner
34 questions
Core concepts every Software Testing / TDD developer must know.
01
What is software testing?
02
What is the difference between verification and validation in testing?
03
What is unit testing?
04
What is integration testing?
05
What is end-to-end (E2E) testing?
06
What is the testing pyramid?
07
What is Test-Driven Development (TDD)?
08
What is BDD (Behavior-Driven Development)?
09
What is a test double?
10
What is mocking in unit testing?
11
What is code coverage?
12
What is the difference between a test stub and a mock?
13
What is regression testing?
14
What is smoke testing?
15
What is acceptance testing?
16
What is functional vs non-functional testing?
17
What is a test fixture?
18
What is a test suite?
19
What is the AAA pattern in unit testing?
20
What is test isolation?
21
What is a happy path test vs an edge case test?
22
What is a flaky test?
23
What is performance testing?
24
What is test automation?
25
What is continuous testing in CI/CD?
26
What is manual testing vs automated testing?
27
What is a test plan?
28
What is a defect lifecycle?
29
What is the difference between severity and priority in bug reporting?
30
What is exploratory testing?
31
What is parameterized testing?
32
What is test-first vs test-last development?
33
What is white-box vs black-box testing?
34
What is a test case?
Intermediate
19 questions
Practical knowledge for developers with hands-on experience.
01
What is the Red-Green-Refactor cycle in TDD?
02
What is the FIRST principle in unit testing?
03
What is test coverage and what are the risks of over-relying on it?
04
What is mutation testing?
05
What is property-based testing?
06
What is contract testing?
07
What is test-driven development in the context of legacy code?
08
What is the test pyramid vs the testing trophy?
09
What is snapshot testing?
10
What is the difference between unit tests and integration tests for databases?
11
How do you test asynchronous code?
12
What is test containerization with Testcontainers?
13
What is test double vs mock framework?
14
What is stubbing HTTP calls in tests?
15
What is the testing scope for microservices?
16
What is chaos engineering?
17
What is code review in the context of quality assurance?
18
What is static analysis and linting in the context of testing?
19
What is the role of a QA engineer?
Advanced
11 questions
Deep expertise questions for senior and lead roles.
01
What is the Outside-In TDD approach?
02
What is the difference between sociable and solitary unit tests?
03
What is trunk-based development and how does it relate to testing?
04
What is approval testing?
05
What is the testing diamond vs testing pyramid?
06
What is load testing and how do you design effective load tests?
07
What is the role of testing in Domain-Driven Design?
08
What are test anti-patterns and how do you avoid them?
09
What is test data management?
10
What is synthetic monitoring vs passive monitoring?
11
What are the principles of good test design?
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64 questions total