Improve reliability of ProposedGeneratedTests

hibernate-core/src/test/java/org/hibernate/orm/test/mapping/generated/temporals/ProposedGeneratedTests.java

@@ -11,6 +11,7 @@
 import jakarta.persistence.Id;
 import jakarta.persistence.Table;
 
+import org.hibernate.HibernateError;
 import org.hibernate.dialect.SybaseASEDialect;
 import org.hibernate.tuple.GenerationTiming;
 
@@ -48,8 +49,8 @@ public void test(SessionFactoryScope scope) throws InterruptedException {
 
 		created.name = "first";
 
-		// Precision is in milliseconds, so sleep a bit to ensure the TS changes
-		Thread.sleep( 10L );
+		//We need to wait a little to make sure the timestamps produced are different
+		waitALittle();
 
 		// then changing
 		final GeneratedInstantEntity merged = scope.fromTransaction( (session) -> {
@@ -64,6 +65,9 @@ public void test(SessionFactoryScope scope) throws InterruptedException {
 
 		assertThat( merged ).isNotNull();
 
+		//We need to wait a little to make sure the timestamps produced are different
+		waitALittle();
+
 		// lastly, make sure we can load it..
 		final GeneratedInstantEntity loaded = scope.fromTransaction( (session) -> {
 			return session.get( GeneratedInstantEntity.class, 1 );
@@ -98,4 +102,14 @@ public GeneratedInstantEntity(Integer id, String name) {
 			this.name = name;
 		}
 	}
+
+	private static void waitALittle() {
+		try {
+			Thread.sleep( 10 );
+		}
+		catch (InterruptedException e) {
+			throw new HibernateError( "Unexpected wakeup from test sleep" );
+		}
+	}
+
 }