Add additional test

hibernate-core/src/test/java/org/hibernate/orm/test/jpa/compliance/CriteriaIsNullTest.java

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+/*
+ * 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.orm.test.jpa.compliance;
+
+import java.util.List;
+
+import org.hibernate.testing.orm.junit.EntityManagerFactoryScope;
+import org.hibernate.testing.orm.junit.Jpa;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToOne;
+import jakarta.persistence.Table;
+import jakarta.persistence.criteria.CriteriaBuilder;
+import jakarta.persistence.criteria.CriteriaQuery;
+import jakarta.persistence.criteria.Root;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+@Jpa(
+		annotatedClasses = {
+				CriteriaIsNullTest.Account.class,
+				CriteriaIsNullTest.Person.class
+		}
+)
+public class CriteriaIsNullTest {
+
+	@Test
+	public void testIsNullInWhereClause(EntityManagerFactoryScope scope) {
+
+
+		Account account1 = new Account( 1, null, null );
+		Account account2 = new Account( 2, "Fab", null );
+
+		Person person1 = new Person( 1, "Luigi", account1 );
+		Person person2 = new Person( 2, "Andrea", account2 );
+		Person person3 = new Person( 3, "Andrea", null );
+
+		scope.inTransaction(
+				entityManager -> {
+					entityManager.persist( account1 );
+					entityManager.persist( account2 );
+					entityManager.persist( person1 );
+					entityManager.persist( person2 );
+					entityManager.persist( person3 );
+				}
+		);
+
+		scope.inEntityManager(
+				entityManager -> {
+					final CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
+
+					final CriteriaQuery<Integer> query = criteriaBuilder.createQuery( Integer.class );
+					final Root<Person> person = query.from( Person.class );
+					query.where( person.get( "account" ).get( "code" ).isNull() );
+					query.select( person.get( "id" ) );
+					final List<Integer> people = entityManager.createQuery( query ).getResultList();
+
+					assertEquals( 1, people.size() );
+					assertEquals( person1.getId(), people.get( 0 ) );
+				}
+		);
+
+	}
+
+	@Entity(name = "Person")
+	public static class Person {
+
+		@Id
+		private Integer id;
+
+		private String name;
+
+		@OneToOne
+		private Account account;
+
+		Person() {
+		}
+
+		public Person(Integer id, String name, Account account) {
+			this.id = id;
+			this.name = name;
+			this.account = account;
+		}
+
+		public Integer getId() {
+			return id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public Account getAccount() {
+			return account;
+		}
+	}
+
+	@Entity(name = "Account")
+	@Table(name = "ACCOUNT_TABLE")
+	public static class Account {
+		@Id
+		private Integer id;
+
+		private String code;
+
+		private Double amount;
+
+		public Account() {
+		}
+
+		public Account(
+				Integer id,
+				String code,
+				Double amount) {
+			this.id = id;
+			this.code = code;
+			this.amount = amount;
+		}
+
+	}
+}