Before going to API Testing, let's first understand
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What is an API?
API is an acronym for Application Programming Interface.
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It enables communication and data exchange between two separate software systems. A software system implementing an API contains functions/sub-routines which can be executed by another software system.
What is API Testing?
API Testing is entirely different from GUI Testing and mainly concentrates on the business logic layer of the software architecture. This testing won't concentrate on the look and feel of an application.
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Instead of using standard user inputs(keyboard) and outputs, in API Testing, you use software to send calls to the API, get output, and note down the system's response.
API Testing requires an application to interact with API. In order to test an API, you will need to
In this tutorial, you will learn-
Set-up of API Test environment
Types of Output of an API
An output of API could be
Let's look at an example of each of the above Types
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Any Type of Data
Example: There is an API function which should add two integer numbers. Astraware word games.
The numbers have to be given as input parameters. The output should be a summation of two integer numbers. This output needs to be verified with an expected outcome.
Calling needs to be done such as
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Exceptions have to be handled if the number is exceeding the integer limit.
Restful Web Apis Pdf
Status (say Pass or Fail)
Consider the below API function -
They return any value such as True (in case of success) or false (In case of error) as an output.
A more accurate Test Case would be, can call the functions in any of the scripts and later check for changes either in the database or the Application GUI.
Calling of another API / Event
In this case, we call one of the API function which in turn will call another function.
For example - First API function can be used for deleting a specified record in the table and this function, in turn, calls another function to REFRESH the database.
Test Cases for API Testing:
Test cases of API testing are based on
Approach of API Testing:
Following points helps the user to do API Testing approach:
Difference between API testing and Unit testing
How to do API Testing
API testing should cover at least following testing methods apart from usual SDLC process
Best Practices of API Testing:
What Is Web ApiTypes of Bugs that API testing detects
Tools for API testingWeb Api Learn
Since API and Unit Testing both target source code, tools/frameworks can be used for their automation.
Check out top API Testing Tools List
Challenges of API Testing
Challenges of API testing includes:
Conclusion:
API consists of a set of classes/functions/procedures which represent the business logic layer. If API is not tested properly, it may cause problems not only the API application but also in the calling application. It is an indispensable test in software engineering.
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