RestAssured: How to check the length of json array response?

Question

I have an endpoint that returns a JSON like:

[   {"id" : 4, "name" : "Name4"},   {"id" : 5, "name" : "Name5"} ] 

and a DTO class:

public class FooDto {     public int id;     public String name; } 

Now, I'm testing the length of the returned json array this way:

@Test public void test() {     FooDto[] foos = RestAssured.get("/foos").as(FooDto[].class);     assertThat(foos.length, is(2)); } 

But, is there any way to do it without cast to FooDto array? Something like this:

@Test public void test() {     RestAssured.get("/foos").then().assertThat()       .length(2); } 

Answer 1

Solved! I have solved it this way:

@Test public void test() {     RestAssured.get("/foos").then().assertThat()       .body("size()", is(2)); } 

Answer 2

You can simply call size() in your body path:

Like:

given()             .accept(ContentType.JSON)             .contentType(ContentType.JSON)             .auth().principal(createPrincipal())             .when()             .get("/api/foo")             .then()             .statusCode(OK.value())             .body("bar.size()", is(10))             .body("dar.size()", is(10));