In this tutorial, I will explain the testing of a JSON Payload using GSON API.
Refer to the below tutorials to understand how GSON works:-
Serialization – How to convert Java Object To JSON Object Using Gson API
Deserialization – How to create JSON Object to JAVA Object Using Gson API
Add below dependency to POM.xml to use Gson API.
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.9</version>
</dependency>
As we know, we can use toJson() to convert the JAVA objects to JSON Payload.
In the below example, I have created a POJO class with the name of EmployeeDetails. This class contains the data members corresponding to the JSON nodes and their corresponding getter and setter methods.
public class EmployeeDetails {
// private variables or data members of pojo class
private String name;
private double salary;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
Below, will create a JSON payload and pass it as a request body to the Rest API.
@Test
public void createEmployee() throws IOException {
// Just create an object of Pojo class
EmployeeDetails emp = new EmployeeDetails();
emp.setName("GsonTest");
emp.setSalary(50000);
emp.setAge(25);
// Converting a Java class object to a JSON payload as string using Gson
Gson builder = new GsonBuilder().setPrettyPrinting().create();
String employeePrettyJsonPayload = builder.toJson(emp);
System.out.println("Request");
System.out.println(employeePrettyJsonPayload);
System.out.println("=========================================");
System.out.println("Response");
// GIVEN
given()
.baseUri("http://dummy.restapiexample.com/api")
.contentType(ContentType.JSON).body(emp)
// WHEN
.when()
.post("/v1/create")
// THEN
.then()
.assertThat().statusCode(200)
.body("status", equalTo("success"))
.body("data.name", equalTo("GsonTest"))
.body("data.salary", equalTo(50000))
.body("data.age", equalTo(25))
.body("message", equalTo("Successfully! Record has been added."))
.log().body();
}
}
Output
We are done! Congratulations on making it through this tutorial and hope you found it useful! Happy Learning!!
QA Automation Expert 