[HHH-17288] Create test with OneToOne relation

Author: The-Huginn

hibernate-core/src/test/java/org/hibernate/orm/test/idclass/IdClassWithOneToOneTest.java

@@ -0,0 +1,122 @@
+package org.hibernate.orm.test.idclass;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.IdClass;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.OneToOne;
+import org.hibernate.annotations.OnDelete;
+import org.hibernate.annotations.OnDeleteAction;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.io.Serializable;
+import java.util.Objects;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+@DomainModel(
+        annotatedClasses = {
+                IdClassWithOneToOneTest.Task.class,
+                IdClassWithOneToOneTest.TaskText.class
+        }
+)
+@SessionFactory(useCollectingStatementInspector = true)
+public class IdClassWithOneToOneTest {
+
+    @BeforeEach
+    void setup(SessionFactoryScope scope) {
+        scope.inTransaction(
+                session -> {
+                    Task task = new Task(new TaskText("en", "Localized in en"));
+                    session.save( task );
+                }
+        );
+    }
+
+    @Test
+    public void testCreate(SessionFactoryScope scope) {
+        scope.inTransaction(
+                session -> {
+                    Task task = session.get(Task.class, 1L);
+                    assertThat( task.text.content, is( "Localized in en" ) );
+                    assertThat( task.text.locale, is( "en" ) );
+                }
+        );
+    }
+
+    @Entity
+    public static class Task {
+
+        @Id
+        @GeneratedValue
+        public Long id;
+
+        @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "task")
+        public TaskText text;
+
+        public Task() {}
+
+        public Task(TaskText text) {
+            this.text = text;
+            text.task = this;
+        }
+    }
+
+    @Entity
+    @IdClass(TaskText.TaskTextPK.class)
+    public static class TaskText {
+
+        public static class TaskTextPK implements Serializable {
+            public Long task;
+            public String locale;
+
+            public TaskTextPK() {}
+
+            public TaskTextPK(Long task, String locale) {
+                this.task = task;
+                this.locale = locale;
+            }
+
+            @Override
+            public boolean equals(Object obj) {
+                if (!(obj instanceof TaskTextPK)) {
+                    return false;
+                } else {
+                    TaskTextPK pk = (TaskTextPK) obj;
+                    return Objects.equals(task, pk.task) && locale.equals(pk.locale);
+                }
+            }
+
+            @Override
+            public int hashCode() {
+                return task.hashCode() + locale.hashCode();
+            }
+        }
+
+        public TaskText() {}
+
+        public TaskText(String locale, String content) {
+            this.locale = locale;
+            this.content = content;
+        }
+
+        @Id
+        @OneToOne(fetch = FetchType.EAGER)
+        @OnDelete(action = OnDeleteAction.CASCADE)
+        @JoinColumn(name = "id")
+        public Task task;
+
+        @Id
+        public String locale;
+
+        public String content;
+    }
+}