@ExtendWith(PactConsumerTestExt.class)

public class ProductConsumerPactTest {

      @Pact(consumer = "FrontendApplication", provider = "ProductService")

      RequestResponsePact getAllProducts(PactDslWithProvider builder) {

        return builder.given("products exist")

          .uponReceiving("get all products")

          .method("GET")

          .path("/products")

          .willRespondWith()

          .status(200)

          .headers(headers())

          .body(newJsonArrayMinLike(2, array ->

            array.object(object -> {

              object.stringType("id", "09");

              object.stringType("type", "CREDIT_CARD");

              object.stringType("name", "Gem Visa");

            })

          ).build())

          .toPact();

      }

      @Pact(consumer = "FrontendApplication", provider = "ProductService")

      RequestResponsePact getOneProduct(PactDslWithProvider builder) {

        return builder.given("product with ID 10 exists")

          .uponReceiving("get product with ID 10")

          .method("GET")

          .path("/products/10")

          .willRespondWith()

          .status(200)

          .headers(headers())

          .body(newJsonBody(object -> {

            object.stringType("id", "10");

            object.stringType("type", "CREDIT_CARD");

            object.stringType("name", "28 Degrees");

          }).build())

          .toPact();

      }

      @Test

      @PactTestFor(pactMethod = "getAllProducts")

      void getAllProducts_whenProductsExist(MockServer mockServer) {

        Product product = new Product();

        product.setId("09");

        product.setType("CREDIT_CARD");

        product.setName("Gem Visa");

        List<Product> expected = Arrays.asList(product, product);

        RestTemplate restTemplate = new RestTemplateBuilder()

          .rootUri(mockServer.getUrl())

          .build();

        List<Product> products = new ProductService(restTemplate).getAllProducts();

        assertEquals(expected, products);

      }

      @Test

      @PactTestFor(pactMethod = "getOneProduct")

      void getProductById_whenProductWithId10Exists(MockServer mockServer) {

        Product expected = new Product();

        expected.setId("10");

        expected.setType("CREDIT_CARD");

        expected.setName("28 Degrees");

        RestTemplate restTemplate = new RestTemplateBuilder()

          .rootUri(mockServer.getUrl())

          .build();

        Product product = new ProductService(restTemplate).getProduct("10");

        assertEquals(expected, product);

      }

      private Map<String, String> headers() {

        Map<String, String> headers = new HashMap<>();

        headers.put("Content-Type", "application/json; charset=utf-8");

        return headers;

      }

}