[#1915] Test identity generation with bacthing

Author: DavideD

hibernate-reactive-core/src/test/java/org/hibernate/reactive/IdentityGenerationWithBatchingTest.java

@@ -0,0 +1,107 @@
+/* Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright: Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.reactive;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+
+import org.hibernate.cfg.AvailableSettings;
+import org.hibernate.cfg.Configuration;
+
+import org.junit.jupiter.api.Test;
+
+import io.vertx.junit5.VertxTestContext;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+
+public class IdentityGenerationWithBatchingTest extends BaseReactiveTest {
+
+	@Override
+	protected Collection<Class<?>> annotatedEntities() {
+		return List.of( Book.class );
+	}
+
+	@Override
+	protected Configuration constructConfiguration() {
+		Configuration configuration = super.constructConfiguration();
+		configuration.setProperty( AvailableSettings.STATEMENT_BATCH_SIZE, "5" );
+		return configuration;
+	}
+
+	@Test
+	public void test(VertxTestContext context) {
+		String[] titles = {
+				"Around the World in Eighty Days",
+				"The Book of M: A Novel",
+				"The Poppy War",
+				"The poetry home repair manual",
+				"Relish"
+		};
+		test( context, getMutinySessionFactory()
+				.withTransaction( s -> s.persistAll( asBooks( titles ) ) )
+				.chain( () -> getMutinySessionFactory().withSession( s -> s.createSelectionQuery( "from Book order by id ASC", Book.class ).getResultList() ) )
+				.invoke( results -> {
+					String[] resultTitles = results.stream().map( Book::getTitle ).toArray( String[]::new );
+					assertThat( resultTitles ).containsExactly( titles );
+					Long savedId = 0L;
+					for ( Book book : results ) {
+						assertThat( book.getId() ).isNotNull().isGreaterThan( savedId );
+						savedId = book.getId();
+					}
+				} )
+		);
+	}
+
+	private Book[] asBooks(String[] titles) {
+		return Arrays.asList( titles ).stream().map( Book::new ).toArray( Book[]::new );
+	}
+
+	@Entity(name = "Book")
+	@Table(name = "books")
+	static class Book {
+
+		@Id
+		@GeneratedValue(strategy = GenerationType.IDENTITY)
+		private Long id;
+
+		private String title;
+
+		public Book() {
+		}
+
+		public Book(String title) {
+			this.title = title;
+		}
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public void setTitle(String title) {
+			this.title = title;
+		}
+
+		@Override
+		public String toString() {
+			return id + ":" + title;
+		}
+	}
+}