How to test a SOAP API by Rest Assured

Testing a SOAP API GET request using Rest Assured is possible but requires understanding how SOAP works. However, SOAP typically uses POST, not GET, because it sends a full XML envelope in the body. But if the SOAP service is exposed via GET (rare, usually for testing or WSDL fetching), we can use RestAssured.get().

Key Concepts:

• SOAP (Simple Object Access Protocol) is a protocol for exchanging structured XML data.

• WSDL (Web Services Description Language) is used to describe SOAP services.

• SOAP API is generally tested using POST, but for some services (like fetching WSDL), GET is used.

Example SOAP GET Use Case:

Fetch the WSDL file or perform a test GET to an endpoint.

Let’s use this public SOAP service for currency conversion WSDL (GET example):
http://www.dneonline.com/calculator.asmx?WSDL

This WSDL can be fetched using a GET request.

Step-by-step: Testing SOAP GET using Rest Assured:

Maven Dependency:

<dependency>
    <groupId>io.rest-assured</groupId>
    <artifactId>rest-assured</artifactId>
    <version>5.3.1</version>
    <scope>test</scope>
</dependency>

Java code:

import io.restassured.RestAssured;
import io.restassured.response.Response;

public class SoapGetTest {
    public static void main(String[] args) {
        // Base URI for the SOAP service
        String url = "http://www.dneonline.com/calculator.asmx?WSDL";

        // Send GET request
        Response response = RestAssured
                .given()
                .when()
                .get(url)
                .then()
                .extract()
                .response();

        // Print status code and response
        System.out.println("Status Code: " + response.getStatusCode());
        System.out.println("Content-Type: " + response.getContentType());
        System.out.println("Response Body:\n" + response.getBody().asString());
    }
}

Optional: Add Test Assertion

import static io.restassured.RestAssured.*;
import static org.hamcrest.Matchers.*;

public class SoapGetTest {
    public static void main(String[] args) {
        given()
        .when()
            .get("http://www.dneonline.com/calculator.asmx?WSDL")
        .then()
            .statusCode(200)
            .contentType("text/xml; charset=utf-8")
            .body(containsString("definitions"));
    }
}