HHH-17290 Add test for issue

Author: dreab8

hibernate-core/src/test/java/org/hibernate/orm/test/embeddable/NullEmbeddableTest.java

@@ -0,0 +1,128 @@
+package org.hibernate.orm.test.embeddable;
+
+import org.hibernate.testing.orm.junit.EntityManagerFactoryScope;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.Jpa;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Embedded;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+@Jpa(
+		annotatedClasses = {
+				NullEmbeddableTest.EntityA.class
+		}
+)
+@JiraKey("HHH-17290")
+public class NullEmbeddableTest {
+
+	@AfterEach
+	public void tearDown(EntityManagerFactoryScope scope) {
+		scope.inTransaction(
+				entityManager -> {
+					entityManager.createQuery( "delete from EntityA" ).executeUpdate();
+				}
+		);
+	}
+
+	@Test
+	public void testPersist(EntityManagerFactoryScope scope) {
+		scope.inTransaction(
+				entityManager -> {
+					EntityA entityA = new EntityA( "1", null );
+					entityManager.persist( entityA );
+				}
+		);
+
+		scope.inTransaction(
+				entityManager -> {
+					EntityA entityA = entityManager.find( EntityA.class, "1" );
+					assertThat( entityA.materialCost ).isNull();
+				}
+		);
+	}
+
+	@Test
+	public void testUpdate(EntityManagerFactoryScope scope) {
+		scope.inTransaction(
+				entityManager -> {
+					EntityA entityA = new EntityA( "1", null );
+					entityManager.persist( entityA );
+				}
+		);
+
+		scope.inTransaction(
+				entityManager -> {
+					EntityA entityA = entityManager.find( EntityA.class, "1" );
+					entityA.materialCost = null;
+				}
+		);
+
+		scope.inTransaction(
+				entityManager -> {
+					EntityA entityA = entityManager.find( EntityA.class, "1" );
+					assertThat( entityA.materialCost ).isNull();
+				}
+		);
+	}
+
+	@Test
+	public void testMerge(EntityManagerFactoryScope scope) {
+		scope.inTransaction(
+				entityManager -> {
+					EntityA entityA = new EntityA( "1", new Cost( 2, "USD" ) );
+					entityManager.persist( entityA );
+				}
+		);
+
+		scope.inTransaction(
+				entityManager -> {
+					EntityA entityA = new EntityA( "1", null );
+					entityManager.merge( entityA );
+				}
+		);
+
+		scope.inTransaction(
+				entityManager -> {
+					EntityA entityA = entityManager.find( EntityA.class, "1" );
+					assertThat( entityA.materialCost ).isNull();
+				}
+		);
+	}
+
+	@Entity(name = "EntityA")
+	public static class EntityA {
+		@Id
+		String id;
+
+		@Embedded
+		Cost materialCost;
+
+		public EntityA() {
+		}
+
+		public EntityA(String id, Cost materialCost) {
+			this.id = id;
+			this.materialCost = materialCost;
+		}
+	}
+
+	@Embeddable
+	public static class Cost {
+		int amount;
+		String currency;
+
+		public Cost() {
+		}
+
+		public Cost(Integer amount, String currency) {
+			this.amount = amount;
+			this.currency = currency;
+		}
+	}
+}