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/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());
+    }
+}