HHH-19476 Add test for issue

Author: dreab8

hibernate-core/src/test/java/org/hibernate/orm/test/jpa/JpaProxyComplianceEnabledTest.java

@@ -0,0 +1,122 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.jpa;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+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.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+@Jpa(
+		annotatedClasses = {
+				JpaProxyComplianceEnabledTest.Provider.class,
+				JpaProxyComplianceEnabledTest.TelephoneNumber.class,
+		},
+		proxyComplianceEnabled = true
+)
+@JiraKey("HHH-19476")
+public class JpaProxyComplianceEnabledTest {
+
+	private static final Integer PROVIDER_ID = 1;
+	private static final Integer TELEPHONE_NUMBER_ID = 2;
+
+	@BeforeAll
+	public static void init(EntityManagerFactoryScope scope) {
+		scope.inTransaction( entityManager -> {
+			Provider provider = new Provider( PROVIDER_ID, "A Provider" );
+			entityManager.persist( provider );
+
+			TelephoneNumber telephoneNumber1 = new TelephoneNumber(
+					TELEPHONE_NUMBER_ID,
+					"123-456-7890",
+					provider
+			);
+			entityManager.persist( telephoneNumber1 );
+		} );
+	}
+
+	@Test
+	public void testJoinFetchAfterFind(EntityManagerFactoryScope scope) {
+		scope.inTransaction( entityManager -> {
+					TelephoneNumber telephoneNumber = entityManager.find( TelephoneNumber.class, TELEPHONE_NUMBER_ID );
+					List<TelephoneNumber> telephoneNumbers = entityManager.createQuery(
+									"from TelephoneNumber t join fetch t.provider",
+									TelephoneNumber.class )
+							.getResultList();
+					assertThat( telephoneNumbers.size() ).isEqualTo( 1 );
+				}
+		);
+	}
+
+	@Entity(name = "TelephoneNumber")
+	public static class TelephoneNumber {
+		@Id
+		private Integer id;
+
+		private String number;
+
+		@ManyToOne(fetch = FetchType.LAZY)
+		@JoinColumn(name = "provider", nullable = false)
+		private Provider provider;
+
+		public TelephoneNumber() {
+		}
+
+		public TelephoneNumber(Integer id, String number, Provider provider) {
+			this.id = id;
+			this.number = number;
+			this.provider = provider;
+		}
+
+		public Integer getId() {
+			return id;
+		}
+
+		public String getNumber() {
+			return number;
+		}
+
+		public Provider getProvider() {
+			return provider;
+		}
+	}
+
+	@Entity(name = "Provider")
+	public static class Provider {
+
+		@Id
+		private Integer id;
+
+		private String name;
+
+		public Provider() {
+		}
+
+		public Provider(Integer id, String name) {
+			this.id = id;
+			this.name = name;
+		}
+
+		public Integer getId() {
+			return id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+	}
+
+}