Spring Boot, Mockito, Unit Testing, Junit 5, Rest Api.
.id("sdasdas-aiuyqwyeq-qwjhgj1786-asbdbasj") .authors(List.of("Pavan Mantha","Deepak Mantha")) .isbn("erty567345fguio") .title("this is the sample title") .categories(List.of("spring","Spring boot")) .longDescription("testing the longer description field just for testing purpose")