HHH-2792 Test remove detached with null values and detached proxy

hibernate-core/src/test/java/org/hibernate/orm/test/deletedetached/DeleteDetachedOptionalityViolationTest.java

@@ -0,0 +1,60 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.deletedetached;
+
+import jakarta.persistence.Basic;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import org.hibernate.PropertyValueException;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+@SessionFactory
+@DomainModel(annotatedClasses = DeleteDetachedOptionalityViolationTest.Thing.class)
+@JiraKey("HHH-2792")
+public class DeleteDetachedOptionalityViolationTest {
+	@Test
+	void testRemoveDetachedWithNull(SessionFactoryScope scope) {
+		Thing thing = new Thing();
+		thing.stuff = "Some stuff about the thing";
+		scope.inTransaction( s -> s.persist( thing ) );
+		scope.inTransaction( s -> {
+			Thing detachedThing = new Thing();
+			detachedThing.id = thing.id;
+			assertThrows( PropertyValueException.class,
+					() -> s.remove( detachedThing ),
+					"not-null property references a null or transient value: " + Thing.class.getName() + ".stuff"
+			);
+		} );
+	}
+
+	@Test
+	void testRemoveDetachedProxy(SessionFactoryScope scope) {
+		Thing thing = new Thing();
+		thing.stuff = "Some stuff about the thing";
+		scope.inTransaction( s -> s.persist( thing ) );
+		Thing detachedThing = scope.fromTransaction( s -> s.getReference( Thing.class, thing.id ) );
+		scope.inTransaction( s -> {
+			s.remove( detachedThing );
+		} );
+		scope.inTransaction( s -> assertNull( s.find( Thing.class, thing.id ) ) );
+	}
+
+	@Entity
+	static class Thing {
+		@GeneratedValue
+		@Id
+		long id;
+		@Basic(optional = false)
+		String stuff;
+	}
+}