api testing

API testing

API testing is a vital part of the software testing process. It verifies whether an application meets its intended functionality, performance, security, and reliability standards. At ApMoSys, we test APIs directly or through their integration with application interfaces, ensuring a complete validation of behavior across all layers.

Through API testing, two applications or systems communicate effectively using APIs. The way one application sends service requests and receives responses is defined within the API code. These applications typically follow a layered architecture: the data layer, service layer (API), and presentation layer (user interface).


API testing focuses on analyzing the business logic as well as the security of the application and data responses. API requests are made to one or more API endpoints then the responses are compared with respect to the expected results.
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How to approach API testing

Scope defining is the very first phase with which API testing process begins which involves a complete understanding of the functioning of the API, the following information is collected as part of this process:

An API testing process should begin with a well-defined scope of the objective of the program which also requires a full knowledge of the API’s desired functionality.

Some Questions that testers should consider include :

•  A List of endpoints to be tested.
•  Expected successful requests response codes.
•  Expected unsuccessful requests response codes.
•  For unsuccessful request s expected error message which appears in the body of the API.

Once the scope is defined, testers create test cases covering all endpoints and conditions. The objective is to validate every possible input scenario to ensure reliable functioning. After drafting the test cases, testers execute them and capture the actual vs. expected results for analysis.

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api testing
API

The test should analyze responses that include:

 •  Reply time
 •  Data quality
 •  Confirmation of authorization
 •  HTTP status code
 •  Error codes.

Web services, databases or web user interfaces endpoints can be analyzed using API testing . Failures due to unexpected inputs are captured by testers. Response time is checked against acceptable threshold as defined in the non-functional requirements. Security aspects of the API is also verified which should save potential attacks.

Affecting the application in adversely is avoided with careful measures while testing by taking care the boundary values. Hence the expected scenarios along with all integration points are verified.

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Types of API tests

  • Validation testing.
  • Functional testing.
  • Load testing.
  • Reliability testing.
  • Security testing.
  • Penetration testing.
  • Fuzz testing.

API testing tools

  • SoapUI.
  • Apache Jmeter.
  • Apigee.
  • REST Assured.
  • Swagger UI.
  • Postman.
  • Katalon.

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