API Application Programming Interface
Application Programming Interface (API)
* * *An Application Programming Interface (API) contains software building tools,subroutine definitions as well as communication protocols that facilitateinteraction between systems. An API may be for a database system, operatingsystem, computer hardware or a web-based system.An Application Programming Interface makes it simpler to use certaintechnologies to build applications for the programmers. API can includespecifications for data structures, variables, routines, object classes,remote calls etc.A diagram that shows the API in the system is as follows −
What do you need To Start API Testing?
First of all, you need to set up a testing environment for API testing thatincludes the required set of parameters around the API.This requires database and server configuration as per the application’srequirements.As you are done setting up an API testing environment, make an API call toensure nothing is broken before you go forward to start thorough testing.You can start by combining your application data with your API tests. Thishelps to ensure that the API performs as expected against possible known inputconfigurations.At the next level, you should organize the API tests. You need to find answersto below questions: * Who is your target audience? * Who is the API user? * Which environment(s) should the API typically be used? * Which aspects are you testing? * Which problems are we testing for? * What are your priorities for testing? * What is supposed to happen under normal circumstances? * What could potentially happen under abnormal circumstances? * What are the criteria for Pass or a Fail? What data is the desired output? What is the chain of events? * Which other APIs could this API interact with? * Who on your team is in charge of testing what?
How to perform API Testing?
API testing is a form of integration testing that is performed to test the APIto validate its functionality, reliability, performance, and security of theapplication for which API is used.In this testing, the APIs and the integrations they enable are tested.This testing is usually performed for software systems that have multipleAPIs.API testing should cover the following testing methods apart from usual SDLCprocess: * Discovery testing: The test group should manually execute the set of calls documented in the API. This could include something like verifying that a specific resource exposed by the API can be listed, created, and deleted as appropriate. * Usability testing: This testing verifies whether the API is user-friendly or not. Does the API integrate well with another platform as well? * Security testing: This testing includes the type of authentication that is required and ensures that the sensitive data is encrypted over HTTP. * Automated testing: API testing should enable the creation of a set of scripts or a tool that can be used to execute the API regularly. * Documentation: The test team takes care of the documentation to ensure it is adequate and provides enough information to interact with the API. Documentation should be a part of the final deliverable.
API Testing Approach
Quality Assurance team performs API testing which is a form of Black BoxTesting. This testing is conducted post the build is ready. The source code isnot included in the this testing.In this testing, a request is sent to the API with known to analyze theresponse that includes: * Accuracy of data * HTTP status code * Response time * Error codes of any errors returned by API * Authorization checks * Results of non-functional tests such as performance, security, etc.
Types of bugs found in API testing
Following are the types of bugs found: * Duplicate or missing functionality * Improper messaging * Error handling mechanism is incompatible * Multi-threaded issues * Security, performance & security issues * Reliability issues
API Testing Tool
For successfully performing API Testing, you require a tool to structure andmanage your test cases. You will also require full traceability ofrequirements and effective API documentation.ReQtest is a test management tool that helps in API testing by allowing you tostructure & categorize your test cases. You will also get full requirementstraceability with a high-level of API documentation. You can sign-up for afree ReQtest trial.
Challenges of API Testing
Just like other software testing techniques, API testing also has somechallenges. Some of the common API testing challenges are given below: * The main challenge in Web API testing is Parameter Combination, Parameter Selection, and Call Sequencing * There is no GUI available to test the application that makes it difficult to give inputs. * To validate and verify the output in a different system is difficult for testers. * The testers must be aware of parameter selection and categorization. * Exception handling function should be tested * Coding knowledge is necessary for testers
API: Application Programming Interface
API stands for application program interface. A programmer writing anapplication program can make a request to the Operating System using API(using graphical user interface or command interface). It is a set ofroutines, protocols and tools for building software and applications. It maybe any type of system like a web-based system, operating-system or a databaseSystem.
What is an API? (Application Programming Interface)
API is the acronym for Application Programming Interface, which is a softwareintermediary that allows two applications to talk to each other. Each time youuse an app like Facebook, send an instant message, or check the weather onyour phone, you’re using an API.What exactly is an API? Finally learn for yourself in this helpful video fromMuleSoft, the API experts.
Examples of web API:
Application of API:
Here, are important Applications of API (stands for Application ProgrammingInterface): * Batch Distribution / Drive Traffic. * Expand Footprint. * Feature Development * Explore New Business Models. * Content Acquisition Advance Business Model. * Internal Content Distribution / Innovation.
API = Application Programming Interface
An API is a set of programming instructions and standards for accessing a webtool or database. A software company releases its API to the public so othersoftware developers can design products that are powered by its service. TheAPI is usually packaged in an SDK.