add a test for round-tripping Instant

hibernate-core/src/test/java/org/hibernate/orm/test/timezones/UTCNormalizedInstantTest.java

@@ -0,0 +1,101 @@
+package org.hibernate.orm.test.timezones;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import org.hibernate.annotations.JdbcTypeCode;
+import org.hibernate.dialect.SybaseDialect;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.hibernate.testing.orm.junit.SkipForDialect;
+import org.junit.jupiter.api.Test;
+
+import java.time.Instant;
+import java.util.TimeZone;
+
+import static java.sql.Types.TIMESTAMP;
+import static java.time.temporal.ChronoUnit.SECONDS;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@DomainModel(annotatedClasses = UTCNormalizedInstantTest.Zoned.class)
+@SessionFactory
+public class UTCNormalizedInstantTest {
+
+	@SkipForDialect(dialectClass = SybaseDialect.class, matchSubTypes = true)
+	@Test void test(SessionFactoryScope scope) {
+		Instant instant = Instant.now();
+		long id = scope.fromTransaction( s-> {
+			Zoned z = new Zoned();
+			z.utcInstant = instant;
+			z.localInstant = instant;
+			s.persist(z);
+			return z.id;
+		});
+		scope.inSession( s-> {
+			Zoned z = s.find(Zoned.class, id);
+			assertEquals( instant, z.utcInstant );
+			assertEquals( instant, z.localInstant );
+		});
+	}
+
+	@SkipForDialect(dialectClass = SybaseDialect.class, matchSubTypes = true)
+	@Test void testWithSystemTimeZone(SessionFactoryScope scope) {
+		TimeZone.setDefault( TimeZone.getTimeZone("CET") );
+		Instant instant = Instant.now();
+		long id = scope.fromTransaction( s-> {
+			Zoned z = new Zoned();
+			z.utcInstant = instant;
+			z.localInstant = instant;
+			s.persist(z);
+			return z.id;
+		});
+		scope.inSession( s-> {
+			Zoned z = s.find(Zoned.class, id);
+			assertEquals( instant, z.utcInstant );
+			assertEquals( instant, z.localInstant );
+		});
+	}
+
+	@Test void testSybase(SessionFactoryScope scope) {
+		Instant instant = Instant.now().truncatedTo(SECONDS);
+		long id = scope.fromTransaction( s-> {
+			Zoned z = new Zoned();
+			z.utcInstant = instant;
+			z.localInstant = instant;
+			s.persist(z);
+			return z.id;
+		});
+		scope.inSession( s-> {
+			Zoned z = s.find(Zoned.class, id);
+			assertEquals( instant, z.utcInstant );
+			assertEquals( instant, z.localInstant );
+		});
+	}
+
+	@Test void testWithSystemTimeZoneSybase(SessionFactoryScope scope) {
+		TimeZone.setDefault( TimeZone.getTimeZone("CET") );
+		Instant instant = Instant.now().truncatedTo(SECONDS);
+		long id = scope.fromTransaction( s-> {
+			Zoned z = new Zoned();
+			z.utcInstant = instant;
+			z.localInstant = instant;
+			s.persist(z);
+			return z.id;
+		});
+		scope.inSession( s-> {
+			Zoned z = s.find(Zoned.class, id);
+			assertEquals( instant, z.utcInstant );
+			assertEquals( instant, z.localInstant );
+		});
+	}
+
+	@Entity(name = "Zoned")
+	public static class Zoned {
+		@Id
+		@GeneratedValue Long id;
+		Instant utcInstant;
+		@JdbcTypeCode(TIMESTAMP)
+		Instant localInstant;
+	}
+}