1. Overview: Why Software Testing Skills Matter (Guru99 Context)
In today’s competitive IT market, software testing is no longer just about finding bugs—it’s about risk mitigation, quality assurance, business continuity, and customer trust. Platforms like Guru99 have become a popular reference point for beginners and experienced testers because they combine theory + real-time examples.
This Guru99 software testing interview questions guide is designed to help:
- Freshers entering QA roles
- Manual testers moving to automation
- Experienced testers (3–10+ years) preparing for interviews
- Leads & managers revising concepts
You’ll find basic → advanced interview questions, real project scenarios, test cases, defect samples, RCA, and practical tool usage.
2. Guru99 Software Testing Interview Questions – Basic Level
Q1. What is Software Testing?
Answer:
Software testing is the process of evaluating a system or application to identify defects and ensure it meets business and technical requirements.
Goal:
- Validate functionality
- Verify performance, security, usability
- Reduce production risk
Q2. What are the main objectives of testing?
- Detect defects early
- Improve software quality
- Ensure customer satisfaction
- Reduce cost of failure
- Validate business requirements
Q3. What is the difference between Verification and Validation?
| Verification | Validation |
| Static process | Dynamic process |
| Reviews, walkthroughs | Actual execution |
| “Are we building it right?” | “Are we building the right product?” |
Q4. What is Manual Testing?
Manual testing is executing test cases without automation tools to validate application behavior.
Examples:
- UI testing
- Exploratory testing
- Ad-hoc testing
Q5. What is Automation Testing?
Automation testing uses scripts/tools to execute test cases automatically.
Popular tools:
- Selenium
- Appium
- TestNG
- JUnit
3. Intermediate Guru99 Software Testing Interview Questions
Q6. What is a Test Case?
A test case is a documented set of steps to verify a specific feature.
Test Case Format:
| Field | Example |
| Test Case ID | TC_LOGIN_001 |
| Scenario | Verify login |
| Precondition | User registered |
| Steps | Enter username/password |
| Expected Result | Login successful |
Q7. What is a Bug / Defect?
A bug is a deviation between expected and actual results.
Q8. Bug Life Cycle (Defect Life Cycle)
- New
- Assigned
- Open
- Fixed
- Retest
- Verified
- Closed / Reopened
Q9. What is Severity vs Priority?
| Severity | Priority |
| Impact on system | Urgency to fix |
| QA driven | Business driven |
Q10. What is Regression Testing?
Re-testing existing functionality after code changes to ensure no new defects are introduced.
4. Advanced Guru99 Software Testing Interview Questions
Q11. What is STLC (Software Testing Life Cycle)?
STLC Phases:
- Requirement Analysis
- Test Planning
- Test Case Design
- Test Environment Setup
- Test Execution
- Test Closure
Q12. What is SDLC?
SDLC Phases:
- Requirement
- Design
- Development
- Testing
- Deployment
- Maintenance
Q13. Difference between SDLC and STLC?
| SDLC | STLC |
| Entire product lifecycle | Testing lifecycle |
| Dev focused | QA focused |
Q14. What is Risk-Based Testing?
Testing strategy where high-risk modules are tested first.
Example:
- Banking → Payments, Login, Fund Transfer
Q15. What is Exploratory Testing?
Simultaneous learning + execution + test design without formal test cases.
5. Scenario-Based Guru99 Software Testing Interview Questions
Q16. Production defect found – what will you do?
Sample Answer:
- Analyze severity & impact
- Inform stakeholders
- Reproduce issue
- Perform RCA
- Verify fix in staging
- Monitor post-deployment
Q17. Requirement is unclear. How do you handle it?
- Discuss with BA/Product Owner
- Analyze similar functionality
- Create assumptions & get sign-off
- Document clarifications
Q18. Developer says “not a bug”. What do you do?
- Share expected behavior proof
- Refer to requirement
- Show screenshots/logs
- Escalate if needed
Q19. Test cases are failing after deployment. Why?
- Environment mismatch
- Data issues
- Config changes
- Dependency failures
Q20. How do you test a feature with no documentation?
- Exploratory testing
- Reverse engineering
- Analyze UI behavior
- Compare with competitors
6. Test Case Writing – Real Examples
Example: Login Page Test Cases
| TC ID | Scenario | Expected Result |
| TC01 | Valid login | Dashboard loads |
| TC02 | Invalid password | Error message |
| TC03 | Blank username | Validation error |
| TC04 | SQL injection | Access denied |
Negative Test Case Example
Input: ‘ OR 1=1 —
Expected: Login should fail
7. Bug Report Example (Industry Standard)
Title: Login fails with valid credentials
Environment: QA | Chrome 122
Steps:
- Open login page
- Enter valid user/pass
- Click Login
Actual: Error displayed
Expected: Successful login
Severity: Critical
Priority: High
8. Root Cause Analysis (RCA) Example
Issue: Payment failure in production
Root Cause: API timeout due to incorrect load balancer config
Fix: Increase timeout & retry logic
Prevention: Add monitoring alerts
9. Automation + API + SQL Interview Questions
Q21. What is Selenium?
Selenium is an open-source tool for automating web applications.
Used with:
- Java, Python, C#
- TestNG, JUnit
Q22. What is API Testing?
Testing APIs to validate response, status code, schema, security.
Q23. Common API Status Codes?
- 200 – OK
- 201 – Created
- 400 – Bad Request
- 401 – Unauthorized
- 404 – Not Found
- 500 – Server Error
Q24. SQL Query to find duplicate records?
SELECT email, COUNT(*)
FROM users
GROUP BY email
HAVING COUNT(*) > 1;
Q25. Difference between UI and API Testing?
| UI Testing | API Testing |
| Slower | Faster |
| UI dependent | UI independent |
| End-to-end | Business logic |
10. Agile Testing Interview Questions (Guru99 Focus)
Q26. What is Agile Testing?
Testing performed continuously during Agile development.
Q27. What is Sprint Testing?
Testing user stories within a sprint timeline.
Q28. What is a User Story?
Short business requirement written from end-user perspective.
Q29. Definition of Done (DoD)?
Criteria that must be met before story is marked complete.
Q30. Role of tester in Scrum?
- Participate in planning
- Clarify acceptance criteria
- Continuous testing
- Sprint demo support
11. Tools Used in Real Projects
Commonly Used QA Tools
- Jira – Defect & sprint tracking
- TestRail – Test case management
- Selenium – UI automation
- Postman – API testing
- Jenkins – CI/CD
12. Domain-Based Testing Examples
Banking
- Fund transfer
- Interest calculation
- Security & encryption
Insurance
- Policy creation
- Premium calculation
- Claims processing
E-Commerce
- Cart checkout
- Payment gateway
- Inventory sync
Healthcare
- HIPAA compliance
- Patient data security
- Audit trails
13. Quick Revision Sheet (Guru99 Style)
- SDLC ≠ STLC
- Severity ≠ Priority
- Regression is mandatory after fixes
- API testing is faster than UI
- Automation complements manual testing
14. FAQ – Guru99 Software Testing Interview Questions
Q. Are Guru99 questions enough for interviews?
Yes, but practical experience + scenarios matter more.
Q. Is automation mandatory?
For experienced roles, yes.
Q. Can freshers crack interviews with manual testing?
Absolutely, with strong fundamentals.