API Testing Interview Questions – Set 02

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What is the HTTP protocol supported by REST?

GET: GET is used to request data from the specified resource.

GET request can be cached and bookmark. It remains in the browser history and has length restriction. When dealing with sensitive data GET requests should not be used.

POST: POST is used to send data to server for creation or updating the resources.

POST requests are never cached or bookmark.

PUT: PUT replaces the current representation of the target resource with the request payload.

DELETE: DELETE removes the specified resource.

OPTIONS: OPTION is used to describe the communication option for the target resources.

HEAD: HEAD asks for response which is identical to GET requests, but without the response body.

What is API framework?

A framework or software framework is a platform for developing software applications. API framework is a foundation on which software developer can build applications for a specific platform.

Example: A framework can include predefined classes and functions that can be used to process input, manage hardware devices and interact with system software.

Framework is similar to an Application Programming Interface, technically framework includes API. Framework serves foundation for programming while API provides access to the elements supported by the framework. Framework also includes code libraries, compiler and other programs used in the software development process.

API framework is defined by configuration file which consists the list of all APIs that is required to be activated and activated for a particular program run.

What are the difference between API testing and UI testing?

UI (User Interface) testing means the testing of the graphical user interface. The focus of UI testing is on the look and feel of the application. In user interface testing the main focus is on how users can interact with app elements such as images, fonts, layout etc. are checked.

API testing allows the communication between two software systems. API testing works on backend also known as backend testing.

What are the tools used for API Testing?

Tools used for API testing are:

  • Parasoft SOAtest
  • PostMan
  • AlertSite API monitoring

What is the way to represent the resource in REST?

REST uses different representation to define the resources like text, JSON and XML. The most popular representation of resources is JSON and XML.

Can we use GET request instead of PUT to create a resource?

PUT or POST method is used create a resource. GET is only used to request the resources.

What are the common tests that performed on API?

Here, are the common tests that performed on API are as:

  1. Response of the API should be verified based on the request. We will verify that the return value is based on request.
  2. When API is updating any data structure we should verify the system is authenticating the outcome.
  3. We will verify whether the API is trigger other event or request another API.
  4. We will verify the behavior of the API when no value is return.

What is SOAP?

SOAP (Simple Object Access Control) . It is an XML based protocol that helps in exchanging information among computers.

What is API test environment?

For API the test environment is a quite complex method where the configuration of server and database is done as per the requirement of the software application. API testing does not involve graphical user interface (GUI).

API is checked for its proper functioning after installation.

What protocol is used by the RESTFUL Web Services?

RESTFUL Web Services uses the HTTP protocol. They use the HTTP protocol as a medium of communication between the client and the server.