Introduction to API Testing Using SoapUI

API Testing is a type of testing that verifies whether APIs and the integrations they enable work in the most optimal manner. This kind of testing focus on using software to make API calls so as to receive an output before logging or observing the system’s output. Most importantly, this verifies that the API returns correct output under varying conditions or not.

This output is typically one of these three:

1. A Pass or Fail status

2. Data or information

3. A call to another API

Why is API testing important?

All forms of software are essential to identify bugs and inconsistencies both when you are releasing a product and as you make sure it continues to work when it’s out in the wild. As it’s very clear that the risk of launching an insecure product or a specially bad product in the market is much more than the cost of testing it.

API testing also comes handy in the following conditions:-

1. Creating loads of dynamic data to throw into your API testing.

2. Repeated test design.

3. Analyzing your functional test coverage to know what you're missing.

4. Flipping between multiple environments quickly, including development, testing, and staging environments.

5. Using multiple datasets at the same time to cover different test scenarios.

6. As with all automation, speeding up the overall testing process.

7. Testing in multiple languages.

Some common types of API testing:-

1. Functionality testing

2. Load testing

3. Security testing

4. Usability testing

There are a couple of tools available to test/ automate APIs.

What is SoapUI?

SOAP UI is one of the open source API Testing cross-platform tools. Using this tester can execute different kinds of tests such as regression, automated functional, load, compliance on different Web API. It also supports the basic standard protocols and technologies for testing different kinds of API’s. Its interface is such simple that both technical and non-technical users can use it seamlessly.

SoapUI is one of the tools available which can be used as it comes with the following advantages:-

1. Parameterization

2. Database verification

3. Groovy support

4. Assertions

5. Dynamic scripting

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