Functional Testing Interview Questions and Answers
Identifying software flaws that interfere with usability or performance is necessary; here, we offer Functional Testing interview questions tailored to experienced and newcomers.
1. What is functional testing?
Functional testing is a practice where software functionalities are tested using various inputs; it involves identifying how they should behave according to expectations, creating input data based on requirements, and running test cases according to these specifications.
2. What is an example of a test case in functional testing?
To illustrate, one applicable testing scenario would involve simulating software’s save button functionality by entering valid or invalid information in the name and email fields, clicking save, and verifying expected results.
3. What is the expected result of the first test case in functional testing?
In its inception, the expected result for an available testing test case should be saving data in a database system.
4. What are the four steps of functional testing?
The four steps include:
Identification of how a feature should behave
Create input data based on requirements.
Execute and compare actual results to desired ones.
5. What is the purpose of functional testing?
Functional testing ensures that software meets user expectations while functioning without issues, defects are identified and repaired before release to ensure the software operates as intended.
6. What are the differences between functional testing and non-functional testing?
Functional and non-functional testing differ in objectives, functionality, and execution parameters; functional testing seeks to verify software actions, while non-functional testing measures the performance of its features or services.
7. What are some advantages of functional testing?
Some benefits of functional testing can include recreating or replicating an actual system, testing customer usage specifications specifically, and not making assumptions or working under false premises about how a system’s structure operates.
8. How is functional testing performed?
The initial step in functional testing entails identifying all product features to be assessed for testing purposes; main functions, error conditions and message usability testing are included as required testing criteria.
Once this step has been taken, test data creation according to requirement specifications is created as input data for functionality testing before test cases containing actual output from this testing are executed in preparation with existing and expected output being compared to assess whether functionality works.
9. What are the categories of functional testing?
Functional testing encompasses functional unit testing, sanity testing, regression tests, integration tests and usability tests.
10. What is unit testing?
Unit testing refers to writing different code units related or unrelated to achieving certain functionality, with code coverage being a key component.
11. What is sanity testing?
Sanity testing entails verifying that all vital functions within an application or system are functioning appropriately after being subject to smoke testing, also called build verification testing.
12. What is regression testing?
Regression testing ensures that adding code enhancements or fixing bugs doesn’t compromise existing functionality, cause instability or violate specifications while remaining fully compliant with them.
13. What is integration testing?
Integration testing entails validating scenarios where multiple functional modules work cohesively when combined to form one end-to-end scenario.
14. What is usability testing?
Usability testing exposes products directly to customers in production environments, providing feedback.
15. What are the two main techniques used in functional testing?
Two significant techniques employed during functional testing are positive and negative testing techniques.
16. What is positive testing?
Positive testing encompasses end-user and system testing, decision-based testing, equal valence tests, boundary value tests and any additional ad hoc assessments that require extensive investigation of software applications or system functionality.
17. What is negative testing?
Negative testing refers to equal-valence partitioning tests, which partition data sets into distinct classes, with each condition needing testing separately.
18. What are the tools used for functional testing?
Functional testing tools like Ranarex Studio, Selenium, Test IO, and Tell Rig may be utilised during functional testing.
19. What is Selenium?
Selenium is an open-source tool designed to automate web browser and application test cases across browsers and programming languages.
20. What are Selenium commands?
Selenium commands utilise locators to locate web elements on websites accurately and precisely, different locators, such as ID name link text, CSS selector partial link text, and expert, all require specific approaches for success.
21. What is the output of Selenium functional testing?
Its Selenium functional testing generally provides evidence of whether its script was successful; depending on this outcome, messages such as “Element Found” and “Element Not Found” may appear.
22. What is software testing, and why is it important?
Software testing is an integral component of the software industry, failure detection occurs by collecting objective user feedback about its quality, risk analysis, and possible threats, such as malicious attacks on an application’s infrastructure.
Testing ensures higher production rates at organisations while ensuring high-quality and practical applications exist on market shelves.
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Software testing encompasses numerous roles, such as test manager, test lead, and tester; a test manager oversees the overall testing process, while test leads manage teams of testers.
24. What is non-functional testing, and what is its objective?
Non-functional testing checks non-functional aspects such as performance, usability, and readability to evaluate software under various situations or conditions.
Ultimately, its goal is to verify or validate the software’s functionality under all possible scenarios or circumstances.
25. What are the benefits of functional testing?
Functional testing allows isolating portions of an overall system’s functionality for testing purposes; as part of black box testing, available tests also consist of test cases tailored specifically to examined components during an exercise.
26. What are the benefits of non-functional testing?
Non-functional testing provides benefits in many forms, from measuring system readiness and operational definition to finding non-functional defects within software applications and providing objective information regarding performance, usability, readability, and non-functional parameters.
27. What are the different types of non-functional testing?
There are various non-functional tests, including documentation testing, installation testing, performance testing, reliability and security testing; documentation testing estimates the required testing effort, coverage and tracking requirements.
28. What is black box testing?
Black box testing refers to software evaluation in which the software’s inner workings remain unknown to the tester, who conducts data input and evaluation tests without knowledge of the application’s internal operations.
29. What are the types of performance testing?
Performance testing comes in various forms: load, stress, endurance, spike, reliability, and security.
30. What is load testing?
Load testing involves monitoring an application’s response time and performance under heavy loads, particularly its response time and stability when operating under stress conditions.
31. What is stress testing?
Stress testing being used as the ultimate validation test for applications beyond normal or peak load conditions, stressing validates their behaviour before they are put through endurance testing processes.
32. What is endurance testing?
Endurance testing entails running an expected load over an extended period to uncover its behaviour.
33. What is spike testing?
Spike testing validates performance characteristics by subjecting systems to different workload models and volumes of stress.
34. What is reliability testing?
Reliability testing aims to ensure the software can run without failure for an extended period, guaranteeing its intended function without error and reliability for its intended usage.
35. What is security testing?
Security testing ensures that data and resources are safe from potential intruders.
36. What is the purpose of user-length testing in functional testing?
User length testing is an integral component of functional testing; each element should have at least two characters within its user length field for uniqueness; if logging in using Gmail ID, for instance, each user must possess their own email or user name as part of user length testing.
37. What are the password requirements for functional testing?
Password requirements play a vital part in functional testing, a primary application usually needs 6 to 32-character passwords.
In contrast, more complex or secure software, like bank or schooling applications, should contain a 32-bit string with at least one unique character, such as capital or small letters.
38. What is the purpose of button testing in functional testing?
One aspect of functional testing that utilises button testing involves visual checks of empty cells when available (if a logging button exists after entering a user name and password is open, for instance).
In addition to making sure user input matches up accurately before activating the looking button test, start the looking button test before entering the log page (user input verification process).
39. What is the primary purpose of a login page in an application?
A login page serves several functions within any app, including being used as the point where errors arise when users attempt to register without directly providing password information.
40. What is the difference between an essential valid distance and functional testing?
Primary Valid Distance refers to client-side requirements wherein applications act as clients; on the other hand, functional testing entails testing an application’s functionality while meeting user needs.
41. What is the rule of functional testing?
Its Functional testing entails performing optimistic test scenarios before moving on to more detrimental ones to ensure that an application meets user needs exactly and works as designed.
42. How can a developer test the unique email ID and password combination?
A developer can test this combination by writing a login test list with 33 characters that ensures the app functions as expected and correctly displays an error message.
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43. What are the different methodologies in functional design?
Functional design employs three primary methods for its testing process: over-testing, optimised testing, and under-testing, over-testing involves optimistic scenario testing, while optimised testing offers multiple repetitions of specific scenarios.
44. What is the difference between positive testing and negative testing?
Positive testing aims to simulate scenarios that go against requirements, while negative testing looks for scenarios that don’t go as expected but still offer valuable data points.
45. What happens if there is limited time for functional testing?
Even with limited resources, positive and negative testing is achievable on schedule; positive testing should ensure code understanding and testing occur before proceeding to negative testing.
Utilise this multiple-choice exam to explore your comprehension.
46. Which of the following is not a step involved in functional testing?
Identifying how a functionality is expected to behave
Creating input data to check the functionality based on requirements
Executing prepared test cases
Comparing actual results with expected results
47. Which of the following is a valid input data for the name field?
Valentino
Steve
Carlito 123
al56 at gmail.com
48. What is the expected result of the first test case in functional testing?
The system saves the data in the database
A pop-up appears asking the user to enter valid information
System crashing
Test case failing
49. What is the first step in functional testing?
Identifying how a functionality is expected to behave
Creating input data to check the functionality based on requirements
Executing the prepared test cases
Comparing actual results with the desired results
50. What should the system do When invalid values are entered in the name and email fields?
Store the data in the database.
Prompt the user to enter valid values and not store the data in the database.
Ignore the invalid values and proceed to the next test case
Raise a defect
51. What are the steps involved in performing functional testing?
Determine the functionality of the product that needs to be tested
Create input data for the functionality to be tested
Determine the output for the functionality under test
Compare the actual output and expected output to determine whether the functionality is working as expected
52. Which of the following is the main focus of functional testing?
Performance of the software
User requirements
User expectations
Customer satisfaction with results
53. Which of the following is not a category of functional testing?
Unit testing
Sanity testing
Regression testing
Usability testing
54. What is the link text used in selenium commands?
ID name
CSS selector
Partial link text
Expert
55. Which of the following is the central area of focus for non-functional testing?
User interactions
System building
System performance
User expectations
56. Which of the following is the central area of focus for functional testing?
User expectations
System interactions
System building
User requirements
57. Which of the following is a type of functional testing?
Usability testing
Scalability testing
Login testing
Readability testing
58. Which of the following is not a type of non-functional testing?
Documentation testing
Installation testing
Performance testing
User acceptance testing
59. Which of the following is NOT a type of functional testing?
Unit testing
Integration testing
System testing
Regression testing
60. Which of the following is NOT a type of non-functional testing?
Load testing
Spike testing
Reliability testing
Security testing
Conclusion
Functional testing is essential in software development to guarantee its functionality and usability.
It tests features and functions of software products to identify any performance or user experience problems that might impact its success.
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