DevLabs Alliance Top 20 Software Testing Interview Questions for SDET
                     Top 20 Software Testing Interview 
Questions for SDET
By DevLabs Alliance
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 Testing Interview Questions for SDET
1. What is the difference between SDET and manual Tester?
SDET is a highly skilled resource having both development and testing skills whereas 
manual testers have limited programming skills and can only prepare and execute the test 
cases.
SDETs can develop test automation tools and can use it but testers are not expected to 
develop the automations tools, they can only use the various automation tools.
 Testing Interview Questions for SDET
2. What are the roles and responsibilities of SDET?
Below are the  roles and responsibilities of SDET :
•   Participation in design and architectural discussion
•   Understanding the project requirements
•   Creation of Automation framework and perform the testing through the framework
•   Build different test scenarios and tests acceptance criteria's
•   SDET works with development team and helps in resolving the issue
•   Creation of defect reports and managing communication with the team
 Testing Interview Questions for SDET
3. What are the roles and responsibilities of Agile Tester?
•  He should attend sprint-planning sessions
•  He should attend daily stand-ups
•  He should be able to communicate with stakeholders and business people for better 
understanding of functionality of the software
•  He should communicate with other teams like development team continuously to 
understand the actual flow of code and short hand-off demonstrations
•  He should not wait for the development to end and then start testing. The testing should 
go in parallel with development throughout the sprint
•  He should be able to automate the maximum test cases using effective testing tools
 Testing Interview Questions for SDET
4. What is the difference between Quality Assurance and Quality 
Control?
Quality Assurance involves in process-oriented activities. It focuses on the approaches, 
techniques, methods and processes and ensures that they are implemented correctly. 
It basically focuses on prevention of defects in the process used to make software 
application.
Quality Control involves in product-oriented activities. It ensures that the approaches, 
techniques, methods and processes that are designed in the project are following 
correctly. 
It focuses on the execution of program or code to identify the defects in the software 
application.
Testing Interview Questions for SDET
5. What is the difference between Severity and Priority?
Severity is defined as the degree of impact a defect has on the application whereas 
Priority defines the order in which a defect should be fixed.
For eg.: A site maintaining the employees record doesn’t allow to save the record on click 
of Save button. So this would be a very severe defect as this is blocking the main 
functionality.
This should be fixed in high priority because primary functionality is breaking.
Testing Interview Questions for SDET
6. Give an example of High Priority and High Severity defect.
Submit button is not working on a login page and customers are unable to login to the 
application.
For eg.: Any site which allow access to authorized users only by giving the valid credentials 
and clicking on Login button.
But login button of the page doesn’t allow the authorized user to enter the site. Then this 
would be the high severity and high priority defect.
Testing Interview Questions for SDET
7. Give an example of Low priority and High Severity defect.
There is a crash in some functionality which is going to deliver after couple of releases.
For eg: A link provided in FAQ page is not opening but this link is rarely used by end user. 
So it can be fixed in some later release. So, this would be a high severity defect because 
some link of the page is not opening but since this is not used by the user, so it can be set 
to low priority.
Testing Interview Questions for SDET
8. State 4 differences between Verification and Validation.
Verification Validation
It is a process of checking if the software being developed It is a process of checking whether the specifications that are 
meets the specification. developed meet the customer’s requirements.
It does not involve execution of the code. It involves execution of the code.
It is done at the time of development. It is done after the completion of development by testing team.
It describes whether the software is accepted by the customer 
It describes whether the outputs are as per the inputs.
or not.
Testing Interview Questions for SDET
9. What are the phases of Software Testing Life Cycle?
Test 
Requirement Test Case Test Test Cycle 
Test Planning Environment 
Analysis Development Execution Closure
Setup
Testing Interview Questions for SDET
10. What is the difference between Test Scenario and Test Case?
Test Scenario describes any functionality that can be tested.
Test case is a document that contains the steps that has to be executed.
For eg.:
Test Scenario: Login into the application
This test scenario is the functionality of the application and it will include number of Test 
cases like:
TC1: Verify whether email is valid.
TC2: Verify whether valid email id and valid password are entered.
TC3: Verify that proper error messages are displayed if wrong email id or password is 
entered.
 Testing Interview Questions for SDET
11. What is Test Plan?
Test Plan is a document that describes the scope, approach, resources and schedule of 
testing activities.
Find the Test Plan template in next slide:
 Testing Interview Questions for SDET
 Testing Interview Questions for SDET
12. What are the components of Test Plan?
•  Test Strategy
•  Test Objective
•  Entry and Exit Criteria
•  Resource Planning
• Test Deliverables
 Testing Interview Questions for SDET
13. What is Test Script?
Test Script is written in a programming language and is a short program to test part of the 
functionality.
For eg.: to click any button, we can write the script as:
click(“buttonName”);
 Testing Interview Questions for SDET
14. What is the difference between Alpha Testing and Beta Testing?
Alpha Testing is a pre-release testing performed by end user representative at the 
developer’s site.
Beta Testing is the testing performed by customers at their own location.
For eg.: When any new android version is released, then alpha testing is done first with the 
developer to verify its functioning.
Once alpha testing is completed, Beta testing is done by the end user to verify that its 
working fine without any bugs and crashes.
 Testing Interview Questions for SDET
15. What is the difference between Sanity Testing and Regression 
Testing?
Sanity Testing is a surface level testing in which tester checks whether whole functionality 
of the software works in a proper way.
Regression Testing is a process of testing changes to programs to make sure that the older 
functionality still works with the new changes.
 Testing Interview Questions for SDET
16. What is Re-testing?
Retesting is a process of checking the bugs that are fixed by development team.
For eg.: If in any release, say 1.1, some defect is introduced which is fixed by developers 
and then released to tester in 1.2 release. Thus in 1.2 release, tester will again test the 
defect to verify whether its been fixed or not. This process of checking the defect again is 
called as Re-testing.
 Testing Interview Questions for SDET
17. What is Boundary Value Testing?
Boundary Value Testing is a testing on boundary conditions, below and above the edges of 
input and output equivalence classes.
For eg.: Some text box takes only values from 3 to 8.
Minimum boundary value: 3
Maximum boundary value: 8
Testing with Invalid inputs: 2(below range) and 9(above range)
Testing with valid inputs: 3(min),4(min+1),7(max-1) and 8(max)
 Testing Interview Questions for SDET
18. Explain Life-Cycle of Defect.
 Testing Interview Questions for SDET
19. What is Traceability Matrix?
Traceability Matrix is a document that shows the relationship between test cases and 
requirements. 
It is prepared before test case designing. 
It ensures that all the requirements and change requests are tested.
 Testing Interview Questions for SDET
20. How Requirement Traceability Matrix(RTM) is prepared?
For preparing the Requirement Traceability Matrix, follow below steps:
•  Gather all requirement documents. Documents include Business Requirement
•  Document, Functional Specification Document, Technical Specification Document.
•  List down all the requirements from Business Requirement Document one by one with   
Requirement Id#.
•  Go to Functional Specification Document and list all functional requirement for each 
business requirement.
•  Open Test Scenario or test case document and link available test case ids to respective 
functional requirements.
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Email: [email protected] 
Contact: +91 9717514555