Is there any opportunity to add assertion message into my method using libraries of Rest Assured? For example, I want to write an assertion message in this chain method without using System.out.println().
given().spec(requestSpecBuilder).when().get(commentsEndPoint).then().
spec(responseSpecification).assertThat().contentType(ContentType.JSON.withCharset("UTF-8"))
No, Rest-Assured doesn't have any methods like this.
To add assertion message, you can use Hamcrest directly.
Response res = given().when().get("your_url");
assertThat("Check status code", res.statusCode(), Matchers.is(200));
You can use org.hamcrest.Matchers.describedAs() to add assertion message:
given().spec(requestSpecBuilder).when().get(commentsEndPoint).then(). spec(responseSpecification) .contentType(describedAs("Error message", equalTo(ContentType.JSON.withCharset("UTF-8"))));