Beginners Guide For API Testing

Most of you must have heard of the term API, some of you might even know what it means. For those who do not know what it is an intermediary which allows 2 application to communicate with one another.No matter what action one performs on applications, every time an API is being called.
API testing does not necessarily require a user interface, it mainly requires the Database.

API Architecture: -

An API mainly consists of the following elements

1. HTTP headers
2. HTTP Request
3. Status Code

API testing is not only the most important test against your application but also the easiest and fastest to execute it. This means that there is no reason why you do not have a comprehensive API test suite. You can easily do an API testing suite with your continuous integration:

1. Test all your points on your local machine from AWS Lambda of all your machines.

2. Quickly ensure that all your services are running as expected.

3. Confirm that all your endpoints are protected from unauthorized and unconfirmed users.

4. See your test execution populate "magical" in your test management tool

While performing API testing, the following things are looked at: - 

1. Examine the status of the boundary and ensure that the test harness API changes the parameters of the calls differently, confirming the functionality and exposing the failures.

2. Creating more value-added parameter combinations to verify the call with two or more parameters

3. Verifying the behavior of the API that is considering external environmental conditions such as files, peripheral devices, and further.

4. Check the sequence of API calls and check whether the API continuously offers useful results from the call.

Common API tests:-

1. Return value based on input status - The return value from the API is checked based on the input status.

2. If the API does not return anything, then verify

3. If the API triggers another event or calls another API, then verify it. Track and verify the event output.

4. If the API is updating any data structure, verify it.