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API Testing: For Secure and Scalable Connections Between Platforms

  • By Content Desk
  • February 22, 2020
  • 4 minutes read
Reading Time: 4 minutes

The price of doing the same old thing is far higher than the price of change – Bill Clinton

Today’s tech-driven enterprises are legit examples of how businesses are dynamically driven by disruptive force of technology. This force expects business to deploy applications with ‘minimal testing’ and quality deliverables. This is where the application quality assurance is paramount to the success of any software product. Test engineers are under constant pressure to withstand clients expectations and fulfill the influx of demands.

Application quality assurance has seen major shift in the recent past. From manual to automation, software testing has come a long way causing the testers to delve deeper from the surface of the application i.e. UI/Graphics and to explore the business logic and database layer.

Application Programming Interface – API Testing is an interface that allows an application to utilize the functions and programs by passing a user interface and communicating directly with the application.

70% of the public APIs rely on REST (Representational State Transfer) through HTTP (Hypertext Transfer Protocol) to request and send data. REST API supports a wide range of data formats. On the other hand, SOAP (Simple object access protocol) only supports XML coupled with JSON to streamline communication. REST or SOAP, it depends on the organizational goals. These APIs add significant value to the application’s performance and help to deliver better and quicker results.

APIs work on the principle of the three – tier architecture, which calls the logical interface of the system for direct operations. This reduces the testing efforts, adds flexibility and minimizes the overall development cycle. The three-tier architecture comprises of:

  • Presentation layer: Front end layer, often called UI or graphical interface for users to access through any application
  • Business logic layer: Comprises of functional business logic, responsible to derive insights and deliver core application capabilities.
  • Database layer: Database or data storage system or data access layer, stores all types of application exchange data or new data.
three tier architecture

API testing is a part of integration testing that ensures every aspect of the application such as functionality, reliability, performance, and security are validated against the expectations.

Let’s understand the need to adopt API Testing

Progressing to work in micros encourages testers to adopt API testing. Microservices are using application programming interfaces (APIs), which are a set of commands for how an application can service. It also enhances the set of functionalities which in future will make place for expansion of new applications as and when the business needs arise. API Testing offers multiple advantages compared to other types of testing such as:


Exchange of data or information between layers are independent of languages like XML or JSON in API testing. Also, without calling user interface(GUI), API testing can explore small errors and perform build.

Improved Test Coverage

Allows automation in test cases which improves overall test coverage and performance of the application.

Faster Release

GUI tests calls user interface which tend to take longer time to run during emergencies like continuous builds. Instead, API Testing is automatic, it takes comparatively lesser time to release builds and is faster and accurate.

Cost-effective Solution

Finding bugs with multiple iterations is a long and expensive task. API testing helps to identify bugs in the GUI phase which helps save significant time and cost.

The global automation testing market size is expected to grow USD 12.6 billion in 2019 to USD 28.8 billion by 2024, at a Compound Annual Growth Rate (CAGR) of 18.0% during the period (2019-2024) – Markets & Markets

For API Test automation, there are few tools like TestingWhiz, ParaSoft, UFT, Testcomplete, Rest Assured and Katalon Studio. These tools help businesses reduce overall cost and increase automation efficiency by minimizing the coding effort.

TestingWhiz is a codeless test automation tool advanced with a rapid automation engine assisting testers to create automated test cases based on a keyword and data-driven structure or object-based architecture. It works on Java scripts that can automate your REST (Representational State Transfer) & SOAP (Simple Object Access Protocol) Web Services without using any specific coding language.

Some salient features of TestingWhiz are:

  • Rapid automation engine
  • Intelligent object eye recorder
  • Centralized repository
  • SVN integration
  • Reusable methods
  • Distributed test execution
  • Mobile testing support
  • Browser compatibility
A case in point

Our client is a leading cloud-based Fax solution provider across multiple geographies. Their business application demands a common API to be managed and maintained globally for multiple customers. Releasing news features quickly with minimum iteration through a manual test approach were major business challenges. Cygnet’s QA experts analyzed the business scenario and implemented ‘API Testing’ to streamline communication between different modules.

Initially, the team started with manual testing with POSTMAN; however, to accommodate all features of the legacy application, hundreds of endpoints were created.

To verify all endpoints and ensure that the business logic remains intact during development, QA engineers started with API automation. The team executed automation scripts consistently through continuous integration and monitored the success and failure ratio.

After implementing API automation during the early phase of development, the team was able to create a stable and flawless application for the client to make early inroads in the market.

In this fast-paced digital world of quality assurance, faster test cycles are paramount to quick software releases in the market. Cygnet Infotech, a cutting-edge technology service provider understanding the urgent needs of the customers and offers automated API testing.

Our QA experts can help you automate the intricate API testing with caution and confidence. Get in touch with our experts at +1-609-245-0971 or

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