API testing by using Swagger

Swagger:

Swagger is a software framework that has many tools available to create, design, and design APIs. Using Swagger we can also add web-services to our code to talk with Java web services. Swagger is a very useful framework for testing APIs without feeling deeply and properly frustrated.

Using Swagger we can perform the following operations on the API:-

1. Get data from backend using the GET method.

2. Insert new data into the database using the POST method.

3. Update the previously saved data using the PUT method.

4. Kill any operation using the DELETE method.

5. Response code for each API according to the status code and their work.

6. Perform end to end testing on a set of APIs.

1. GET method -The GET method is to retrieve data from a backend that is already saved inside the database.

Here's an example -

If we want to get the list of all countries and it is saved inside the database then we will use the GET method.

2. POST method –The POST method is for adding/inserting new data to the database.

Like - if we want to log in successfully on any platform, we will use the POST method, to test the functionality of APIs developed from developers.

3. PUT method –The PUT method is for updating data already saved inside the database.

Like - if a user wants to update his password, an API that is with the PUT method will be developed by the developers.

4. DELETE method –The DELETE method is for killing operation and the user will not be able to go beyond the current state.

Like - if we want to do the LOGOUT operation, the developers will develop an API using the DELETE method as it kills the whole operation which is running inside the backend.

5. Status and Response Code –This is a very important part of every API how it is working when uploaded to an HTTP server.

Some basic and most useful status codes are -

100 – Continue

200 – OK

202 – Accepted

301 – Moved Permanently

400 – Bad Request

401 – Unauthorised

403 – Forbidden

404 – Content Not Found

500 – Internal Server Error (ISE)

501 – Not Implemented

502 – Bad Request

6. End to End testing –When a developer writes code for any operation, he writes code for all possible scenarios related to the written code, which can be used by the end-user and if required by UI design.

To test all functionalities, test engineers test all APIs of the developed controller

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