How can I use then() block with RestAssured while using POJO classes? - rest

Question

While working on RestAssured I came across the concept of Serialization and DeSerialization(POJO Classes) to read and validate the response. I went through some tutorial and was able to create the POJO class based on my response.
However, when I use the POJO class reference in my Tests I am not able to use the then() block for different assertions. Below details might clear things bit more :
TestMethod without POJO :
public void listUsers() {
RestAssured.baseURI="https://reqres.in/";
Response res = RestAssured.given()
.contentType("application/json")
.queryParam("page", 2)
.when()
.get("/api/users")
.then()
.assertThat().statusCode(200).and()
.body("page", Matchers.equalTo(2)).and()
.body("total", Matchers.greaterThanOrEqualTo(1))
.body("data.email", Matchers.hasItem("george.edwards#reqres.in"))
.extract().response();
JsonPath jsonpath = new JsonPath(res.asString());
System.out.println(jsonpath.get("data[0].email"));
}
Test Method with POJO :
public void listUserswithPOJO() {
RestAssured.baseURI="https://reqres.in/";
ListUsers res = RestAssured.given()
.contentType("application/json")
.queryParam("page", 2)
.when()
.get("/api/users").as(ListUsers.class);
System.out.println(res.getData().get(1).getEmail());
}
Test Class :
#Test
public void listUsersTest() {
ReqResApi TS1 = new ReqResApi();
TS1.listUserswithPOJO();
}
I want to keep the assertions of the then block as it is while using POJO classes as well. When I try to do so after as(ListUser.class), it gives the compilation error that then() is undefined for ListUser class.
Is there any way in which I can use both POJO class as well as then() block in my rest assured tests.

Answer 1

This is not possible because Return types of these options are different.
MainPojo m1 =RestAssured.given().contentType("application/json").queryParam("page", 2).when().get("/api/users")
.as(MainPojo.class)==> Return Type is ur Class, in this example Main Pojo
System.out.println(m1.getData().get(0).getFirst_name());
RestAssured.given().contentType("application/json").queryParam("page", 2).when()
.get("/api/users").then().assertThat().statusCode(200).and().body("page", Matchers.equalTo(2)).and()
.body("total", Matchers.greaterThanOrEqualTo(1))
.body("data.email", Matchers.hasItem("george.edwards#reqres.in")).extract().response();---> Return Type is Response