Pageble GET with defaults

src/main/java/djmil/cashcard/CashCardController.java

@@ -1,5 +1,9 @@
 package djmil.cashcard;
 
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -10,6 +14,7 @@ import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.util.UriComponentsBuilder;
 
 import java.net.URI;
+import java.util.List;
 import java.util.Optional;
 
 @RestController
@@ -33,10 +38,27 @@ public class CashCardController {
         }
     }
 
+    // @GetMapping()
+    // public ResponseEntity<Iterable<CashCard>> findAll() {
+    //     return ResponseEntity.ok(cashCardRepository.findAll());
+    // }
+
+    @GetMapping
+    public ResponseEntity<List<CashCard>> findAll(Pageable pageable) {
+        Page<CashCard> page = cashCardRepository.findAll(
+                PageRequest.of(
+                        pageable.getPageNumber(),
+                        pageable.getPageSize(),
+                        //pageable.getSort()
+                        pageable.getSortOr(Sort.by(Sort.Direction.ASC, "amount"))
+        ));
+        return ResponseEntity.ok(page.getContent());
+    }
+
     @PostMapping
     private ResponseEntity<Void> createCashCard(@RequestBody CashCard newCashCardRequest, UriComponentsBuilder ucb) {
         CashCard savedCashCard = cashCardRepository.save(newCashCardRequest); // CRUD - Create
-        
+
         URI locationOfNewCashCard = ucb
                 .path("cashcards/{id}")
                 .buildAndExpand(savedCashCard.id())

src/main/java/djmil/cashcard/CashCardRepository.java

@@ -1,6 +1,11 @@
 package djmil.cashcard;
 
 import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.PagingAndSortingRepository;
 
-public interface CashCardRepository extends CrudRepository<CashCard, Long> {
+public interface 
+    CashCardRepository 
+extends 
+    CrudRepository<CashCard, Long>, 
+    PagingAndSortingRepository<CashCard, Long> {
 }

src/test/java/djmil/cashcard/CashCardJsonTest.java

@@ -1,5 +1,7 @@
 package djmil.cashcard;
 
+import org.assertj.core.util.Arrays;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.json.JsonTest;
@@ -15,6 +17,19 @@ public class CashCardJsonTest {
     @Autowired
     private JacksonTester<CashCard> json;
 
+    @Autowired
+    private JacksonTester<CashCard[]> jsonList;
+
+    private CashCard[] cashCards;
+    
+    @BeforeEach
+    void setUp() {
+        cashCards = Arrays.array(
+                new CashCard(99L, 123.45),
+                new CashCard(100L, 1.00),
+                new CashCard(101L, 150.00));
+    }
+
     @Test
     public void myFirstTest() {
         assertThat(1).isEqualTo(1);
@@ -49,4 +64,21 @@ public class CashCardJsonTest {
         assertThat(json.parseObject(expected).id()).isEqualTo(1000);
         assertThat(json.parseObject(expected).amount()).isEqualTo(67.89);
     }
+
+    @Test
+    void cashCardListSerializationTest() throws IOException {
+        assertThat(jsonList.write(cashCards)).isStrictlyEqualToJson("list.json");
+    }
+
+    @Test
+    void cashCardListDeserializationTest() throws IOException {
+        String expected="""
+                [
+                    { "id": 99, "amount": 123.45 },
+                    { "id": 100, "amount": 1.00 },
+                    { "id": 101, "amount": 150.00 }
+                ]
+                """;
+        assertThat(jsonList.parse(expected)).isEqualTo(cashCards);
+    }
 }

src/test/java/djmil/cashcard/CashcardApplicationTests.java

@@ -7,15 +7,19 @@ import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.web.client.TestRestTemplate;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+import org.springframework.test.annotation.DirtiesContext;
 
 import com.jayway.jsonpath.DocumentContext;
 import com.jayway.jsonpath.JsonPath;
 
+import net.minidev.json.JSONArray;
+
 import java.net.URI;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+//@DirtiesContext(classMode = ClassMode.AFTER_EACH_TEST_METHOD)
 class CashcardApplicationTests {
 
 	@Test
@@ -49,6 +53,7 @@ class CashcardApplicationTests {
 	}
 
 	@Test
+	@DirtiesContext
 	void shouldCreateANewCashCard() {
 		CashCard newCashCard = new CashCard(null, 250.00);
 		ResponseEntity<Void> createResponse = restTemplate.postForEntity("/cashcards", newCashCard, Void.class );
@@ -67,4 +72,56 @@ class CashcardApplicationTests {
 		assertThat(id).isNotNull();
 		assertThat(amount).isEqualTo(250.00);
 	}
+
+	@Test
+	void shouldReturnAllCashCardsWhenListIsRequested() {
+		ResponseEntity<String> response = restTemplate.getForEntity("/cashcards", String.class);
+		assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
+
+		DocumentContext documentContext = JsonPath.parse(response.getBody());
+		int cashCardCount = documentContext.read("$.length()");
+		assertThat(cashCardCount).isEqualTo(3);
+   
+		JSONArray ids = documentContext.read("$..id");
+		assertThat(ids).containsExactlyInAnyOrder(99, 100, 101);
+   
+		JSONArray amounts = documentContext.read("$..amount");
+		assertThat(amounts).containsExactlyInAnyOrder(123.45, 1.0, 150.00);
+	}
+
+	@Test
+	void shouldReturnAPageOfCashCards() {
+		ResponseEntity<String> response = restTemplate.getForEntity("/cashcards?page=0&size=1", String.class);
+		assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
+
+		DocumentContext documentContext = JsonPath.parse(response.getBody());
+		JSONArray page = documentContext.read("$[*]");
+		assertThat(page.size()).isEqualTo(1);
+	}
+
+	@Test
+	void shouldReturnASortedPageOfCashCards() {
+		ResponseEntity<String> response = restTemplate.getForEntity("/cashcards?page=0&size=1&sort=amount,desc", String.class);
+		assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
+
+		DocumentContext documentContext = JsonPath.parse(response.getBody());
+		JSONArray read = documentContext.read("$[*]");
+		assertThat(read.size()).isEqualTo(1);
+
+		double amount = documentContext.read("$[0].amount");
+		assertThat(amount).isEqualTo(150.00);
+	}
+
+	@Test
+	void shouldReturnASortedPageOfCashCardsWithNoParametersAndUseDefaultValues() {
+		ResponseEntity<String> response = restTemplate.getForEntity("/cashcards", String.class);
+		assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
+
+		DocumentContext documentContext = JsonPath.parse(response.getBody());
+		JSONArray page = documentContext.read("$[*]");
+		assertThat(page.size()).isEqualTo(3);
+
+		JSONArray amounts = documentContext.read("$..amount");
+		assertThat(amounts).containsExactly(1.00, 123.45, 150.00);
+	}
 }

src/test/resources/data.sql

@@ -1 +1,3 @@
-INSERT INTO CASH_CARD(ID, AMOUNT) VALUES (99, 123.45);
+INSERT INTO CASH_CARD(ID, AMOUNT) VALUES (99, 123.45);
+INSERT INTO CASH_CARD(ID, AMOUNT) VALUES (100, 1.00);
+INSERT INTO CASH_CARD(ID, AMOUNT) VALUES (101, 150.00);

src/test/resources/djmil/cashcard/list.json

@@ -0,0 +1,5 @@
+[
+    { "id": 99, "amount": 123.45 },
+    { "id": 100, "amount": 1.0 },
+    { "id": 101, "amount": 150.0 }
+]