HHH-10843 - Add test for issue

(cherry picked from commit a3ed7010b6)

hibernate-core/src/test/java/org/hibernate/jpa/test/criteria/basic/ConcatTest.java

@@ -0,0 +1,146 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.jpa.test.criteria.basic;
+
+import javax.persistence.Entity;
+import javax.persistence.EntityManager;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import javax.persistence.criteria.CriteriaBuilder;
+import javax.persistence.criteria.CriteriaQuery;
+import javax.persistence.criteria.Root;
+import java.io.Serializable;
+import java.util.List;
+
+import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import org.hibernate.testing.TestForIssue;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * @author Andrea Boriero
+ */
+@TestForIssue(jiraKey = "HHH-10843")
+public class ConcatTest extends BaseEntityManagerFunctionalTestCase {
+
+	@Override
+	protected Class<?>[] getAnnotatedClasses() {
+		return new Class[] {TestEntity.class};
+	}
+
+	@Before
+	public void setUp() {
+		EntityManager entityManager = getOrCreateEntityManager();
+		entityManager.getTransaction().begin();
+		try {
+			TestEntity testEntity = new TestEntity();
+			testEntity.setName( "test_1" );
+			entityManager.persist( testEntity );
+			entityManager.getTransaction().commit();
+		}
+		catch (Exception e) {
+			if ( entityManager.getTransaction().isActive() ) {
+				entityManager.getTransaction().rollback();
+			}
+			throw e;
+		}
+		finally {
+			entityManager.close();
+		}
+	}
+
+	@Test
+	public void testSelectCaseWithConcat() throws Exception {
+		EntityManager entityManager = getOrCreateEntityManager();
+		entityManager.getTransaction().begin();
+		try {
+			CriteriaBuilder cb = entityManager.getCriteriaBuilder();
+			CriteriaQuery<Object[]> query = cb.createQuery( Object[].class );
+			Root<TestEntity> testEntity = query.from( TestEntity.class );
+
+			query.multiselect(
+					cb.selectCase()
+							.when( cb.isNotNull( testEntity.get( "id" ) ), cb.concat( "test", cb.literal( "_1" ) ) )
+							.otherwise( cb.literal( "Empty" ) ),
+					cb.trim( cb.concat( ".", cb.literal( "Test   " ) ) )
+			);
+
+			final List<Object[]> results = entityManager.createQuery( query ).getResultList();
+			assertThat( results.size(), is( 1 ) );
+			assertThat( results.get( 0 )[0], is( "test_1" ) );
+			assertThat( results.get( 0 )[1], is( ".Test" ) );
+			entityManager.getTransaction().commit();
+		}
+		catch (Exception e) {
+			if ( entityManager.getTransaction().isActive() ) {
+				entityManager.getTransaction().rollback();
+			}
+			throw e;
+		}
+		finally {
+			entityManager.close();
+		}
+	}
+
+	@Test
+	public void testConcat() throws Exception {
+		EntityManager entityManager = getOrCreateEntityManager();
+		entityManager.getTransaction().begin();
+		try {
+			CriteriaBuilder cb = entityManager.getCriteriaBuilder();
+			CriteriaQuery query = cb.createQuery();
+			Root<TestEntity> testEntity = query.from( TestEntity.class );
+
+			query.select( testEntity ).where( cb.equal( testEntity.get( "name" ), cb.concat( "test", cb.literal( "_1" ) ) ) );
+
+			final List results = entityManager.createQuery( query ).getResultList();
+			entityManager.getTransaction().commit();
+
+			assertThat( results.size(), is( 1 ) );
+		}
+		catch (Exception e) {
+			if ( entityManager.getTransaction().isActive() ) {
+				entityManager.getTransaction().rollback();
+			}
+			throw e;
+		}
+		finally {
+			entityManager.close();
+		}
+	}
+
+	@Entity(name = "TestEntity")
+	@Table(name = "TEST_ENTITY")
+	public static class TestEntity implements Serializable {
+		@Id
+		@GeneratedValue
+		private Integer id;
+		private String name;
+
+		public Integer getId() {
+			return id;
+		}
+
+		public void setId(Integer id) {
+			this.id = id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+	}
+}