For now, we will focus on REST API testing using REST Assured. There are different types of APIs such as SOAP, REST, and RPC, etc. API testing plays a crucial role in the software development process as it helps us to test the business logic of the application even before the UI is ready. REST Assured can work with both types of parameters.API is the acronym for Application Programming Interface, which acts as an interface between two applications to communicate with each other irrespective of the programming languages used to develop them. Try and replace it with "2016" and see what happens (hint: the previous test should fail, since there were 21 Formula 1 races in 2016, not 20). For example, in the endpoint we used earlier:, "2017" is a path parameter value. Path parameters: These are part of the RESTful API endpoint.For example, in the endpoint, "text" is a query parameter (with value "test"). Query parameters: These are appended at the end of a RESTful API endpoint and can be identified by the question mark in front of them.RESTful APIs support two different types of parameters: Instead of writing a new test for each test data record, you'll want to create a parameterized test and feed it with as many test data records as your desired test coverage requires. Often, you'll want to repeat the same test with various sets of (input and output) parameters-a concept known as data-driven testing. To illustrate the way tests are written using REST Assured, here is a test that retrieves the list of circuits for the 2017 Formula 1 season in JSON format and checks that there are 20 circuits in the void test_NumberOfCircuitsFor2017Season_ShouldBe20() This example also shows how you can easily concatenate checks in a readable manner using the and() method, which is only syntactic sugar, meaning that making the code more readable is all that it does. This API provides historical data related to Formula 1 races, drivers, circuits, and much more. First test: Understanding the syntaxįor this tutorial, we'll test the Ergast Motor Racing Database API, which can be found here. Import static io.restassured.RestAssured.* Īnd you're ready to create your first REST Assured test. Once you have the import of REST Assured set up, add the following static imports to your test class: For the examples presented in this tutorial, I used REST Assured with TestNG. REST Assured can be used easily in combination with existing unit testing frameworks, such as JUnit and TestNG. TestCompile 'io.rest-assured:rest-assured:3.0.2' If you're using Maven, add the following entry to your pom.xml (change the version number to reflect the version you want to use): To get started with REST Assured, simply add it as a dependency to your project. I'll be using real-world code examples you can copy, run, and reuse directly in your own test automation efforts. In the following sections, I'll show you how to set up and configure REST Assured, write and run REST Assured tests, and apply some of its most powerful features. REST Assured is a Java library that provides a domain-specific language (DSL) for writing powerful, maintainable tests for RESTful APIs. I'm going to show you how to use one of the most popular open-source tools for this task: REST Assured. There are many different tools out there that can assist you in writing these automated tests at the API level. Now that APIs are playing an ever more important role in software trends (such as mobile applications, the Internet of Things, etc.), proper automated testing of these APIs is becoming indispensable.
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