BAEL-2095 CrudRepository save() method (#5223)

* BAEL-2095 CrudRepository save() method

* BAEL-2095 Enhanced the MerchandiseEntity with additional attributes; added unit-tests; removed spring boot runner

* BAEL-2095 Test renamed to end with IntegrationTest to make it past Travis's rules

spring-data-jpa/src/main/java/com/baeldung/dao/repositories/InventoryRepository.java

@@ -0,0 +1,7 @@
+package com.baeldung.dao.repositories;
+
+import com.baeldung.domain.MerchandiseEntity;
+import org.springframework.data.repository.CrudRepository;
+
+public interface InventoryRepository extends CrudRepository<MerchandiseEntity, Long> {
+}

spring-data-jpa/src/main/java/com/baeldung/domain/MerchandiseEntity.java

@@ -0,0 +1,66 @@
+package com.baeldung.domain;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import java.math.BigDecimal;
+
+@Entity
+public class MerchandiseEntity {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    private String title;
+
+    private BigDecimal price;
+
+    private String brand;
+
+    public MerchandiseEntity() {
+    }
+
+    public MerchandiseEntity(String title, BigDecimal price) {
+        this.title = title;
+        this.price = price;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public BigDecimal getPrice() {
+        return price;
+    }
+
+    public void setPrice(BigDecimal price) {
+        this.price = price;
+    }
+
+    public String getBrand() {
+        return brand;
+    }
+
+    public void setBrand(String brand) {
+        this.brand = brand;
+    }
+
+    @Override
+    public String toString() {
+        return "MerchandiseEntity{" +
+                "id=" + id +
+                ", title='" + title + '\'' +
+                ", price=" + price +
+                ", brand='" + brand + '\'' +
+                '}';
+    }
+}

spring-data-jpa/src/test/java/com/baeldung/dao/repositories/InventoryRepositoryIntegrationTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.dao.repositories;
+
+import com.baeldung.config.PersistenceConfiguration;
+import com.baeldung.domain.MerchandiseEntity;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.math.BigDecimal;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
+
+@RunWith(SpringRunner.class)
+@DataJpaTest(excludeAutoConfiguration = {PersistenceConfiguration.class})
+public class InventoryRepositoryIntegrationTest {
+
+    private static final String ORIGINAL_TITLE = "Pair of Pants";
+    private static final String UPDATED_TITLE = "Branded Luxury Pants";
+    private static final String UPDATED_BRAND = "Armani";
+    private static final String ORIGINAL_SHORTS_TITLE = "Pair of Shorts";
+
+    @Autowired
+    private InventoryRepository repository;
+
+    @Test
+    public void shouldCreateNewEntryInDB() {
+        MerchandiseEntity pants = new MerchandiseEntity(ORIGINAL_TITLE, BigDecimal.ONE);
+        pants = repository.save(pants);
+
+        MerchandiseEntity shorts = new MerchandiseEntity(ORIGINAL_SHORTS_TITLE, new BigDecimal(3));
+        shorts = repository.save(shorts);
+
+        assertNotNull(pants.getId());
+        assertNotNull(shorts.getId());
+        assertNotEquals(pants.getId(), shorts.getId());
+    }
+
+    @Test
+    public void shouldUpdateExistingEntryInDB() {
+        MerchandiseEntity pants = new MerchandiseEntity(ORIGINAL_TITLE, BigDecimal.ONE);
+        pants = repository.save(pants);
+
+        Long originalId = pants.getId();
+
+        pants.setTitle(UPDATED_TITLE);
+        pants.setPrice(BigDecimal.TEN);
+        pants.setBrand(UPDATED_BRAND);
+
+        MerchandiseEntity result = repository.save(pants);
+
+        assertEquals(originalId, result.getId());
+        assertEquals(UPDATED_TITLE, result.getTitle());
+        assertEquals(BigDecimal.TEN, result.getPrice());
+        assertEquals(UPDATED_BRAND, result.getBrand());
+    }
+}