API Testing Interview Questions

If you're looking for API Testing Interview Questions for Experienced or Freshers, you are at the right place. There are a lot of opportunities from many reputed companies in the world. According to research API Testing has a market share of about 16.7%. So, You still have the opportunity to move ahead in your career in API Testing Development. Mindmajix offers Advanced API Testing Interview Questions 2022 that helps you in cracking your interview & acquire a dream career as API Testing Developer.

Basic API Testing Interview Questions For Freshers

1. What does API testing mean?

API stands for Application Programming interface details regarding how some software components must act together. In general terms, API testing is a set of procedures and functions allowing the creation of apps accessing data or features of an operating system or application. All in all, testing of such procedures is acknowledged as API testing.

2. What are the names of tests executed on APIs?

There can be numerous reasons behind executing API testing and there are a number of tests that can be performed on APIs. Some common API test examples are as follows:

• Any data structure which demands proper validation can be updated by API
• In case some interruption arises during the process or any other event is prompted, you can call another API
• Tests for inputting condition-based return values can be performed
• With the help of these tests, some resources can be easily modified like process killing, an update of the database, etc.
• The return values can also be tested which can be even null or are with wrong results

3. What is the procedure to perform API testing and what exactly needs to be checked?

During the API testing process, a request is raised to the API with the known data. This way you can analyze the validation response. Basically, things that must be checked during performing API testing are:

1. Accuracy of data 
2. Schema validation
3.  HTTP status codes
4. Data type, validations, order, and completeness 
5. Authorization checks 
6. Implementation of response timeout
7. Error codes in case API returns, and
8. Non-functional testing like performance and security testing.

4. What is the test environment of API?

To set up the test environment of API is not a cakewalk. It is a bit complete and demands the configuration of the database as well as a server according to the need of the software. There is no availability of GUI (Graphical User Interface) in this form of testing.

Once the installation process is over, API is verified for proper functioning. During the whole process API that is invoked by the initial environment is being set up with distinct parameters to examine the test results.

5. What approach should be followed for API testing?

There are certain factors that determine the API testing approach. Let’s check them below:

1.  Defining the accurate input parameters
2.  Verifying the calls of the blend of two or more than two value-added parameters 
3.  Defining the basic functionality and scope of the API program
4.  Writing suitable API test cases and making use of testing techniques like equivalence class, boundary-value, etc. to verify the functionality 
5. Testing case execution 
6. Testing result comparisons with the results expected 
7. Verifying behavior of API under conditions like the connection with files etc.

6. Define the basic difference between API testing and UI level testing?

UI testing means the testing of the graphical interface. Its focus is basically on the feel and looks of an application. Within user interface testing, things like how the user interacts with app elements such as images, fonts, layouts, etc are checked.

On the other hand API, testing allows communicating between two different software systems. During this testing, a software system that implements an API includes sub-routines or functions that can be performed by other software systems.

7. Name the common protocols used in API testing.

Many protocols are there that can be used in API testing. These are as follows:

JMS, REST, HTTP, UDDI, and SOAP

8. Name different tools used for API testing.

There are many testing tools available that can be used for API testing. A few of them are:

Postman, SoapUi Pro, Curl, and Alert site API monitoring

9. What is SOAP?

The term SOAP refers to Simple Object Access Control. In simple terms, it is an XML-based protocol that helps in exchanging information among computers. 

10. What’s the procedure to test API’s?

For testing API’s one must follow the below-mentioned steps:

1.  Make a selection of the suite you like to add the API test case to
2. Now choose the test development mode
3. Next demands the development of test cases for the required API methods 
4. After this, you need to configure the control parameters of the application and then test conditions
5. Once done with all the previous steps, configure method validation
6. Now is the time for execution of the API test
7. After this, you can check test reports and filter API test cases 
8. Last but not least, sequence all API test cases. That’s it!

11. What is REST API?

REST API is a set of functions helping developers in performing requests along with receiving responses. Through HTTP protocol interaction is made in REST API. 

The term REST refers to Representational State Transfer. In a very short span of time, it has become an effective standard for API creation.

12. What are the areas that need to be taken care of while writing API documents?

The main areas that need your concentration while writing API documents are as follows:

1. You need to check the source of the content 
2. Plan or sketch of your document
3. The delivery layout of the same
4. Information needed for each of the functions available in the document
5. Lastly, automatic document creation programs

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