add tests for Expression.cast()

this was new in JPA 3.2

Author: gavinking

hibernate-core/src/test/java/org/hibernate/orm/test/query/criteria/CastTest.java

@@ -0,0 +1,50 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.query.criteria;
+
+import org.hibernate.testing.orm.junit.EntityManagerFactoryScope;
+import org.hibernate.testing.orm.junit.Jpa;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@Jpa()
+class CastTest {
+	@Test void testCastToString(EntityManagerFactoryScope scope) {
+		scope.inEntityManager( entityManager -> {
+			var builder = entityManager.getCriteriaBuilder();
+			var query = builder.createQuery( Object[].class );
+			query.select( builder.array(
+					builder.literal( 69 ).cast( String.class ),
+					builder.literal( 69L ).cast( String.class ),
+					builder.literal( 1.0F ).cast( String.class ),
+					builder.literal( 1.0D ).cast( String.class )
+			) );
+			var result = entityManager.createQuery( query ).getSingleResult();
+			assertEquals( "69", result[0] );
+			assertEquals( "69", result[1] );
+			assertEquals("1.0", result[2] );
+			assertEquals("1.0", result[3] );
+		} );
+	}
+
+	@Test void testCastFromString(EntityManagerFactoryScope scope) {
+		scope.inEntityManager( entityManager -> {
+			var builder = entityManager.getCriteriaBuilder();
+			var query = builder.createQuery( Object[].class );
+			query.select( builder.array(
+					builder.literal( "69" ).cast( Integer.class ),
+					builder.literal( "69" ).cast( Long.class ),
+					builder.literal( "1.0" ).cast( Float.class ),
+					builder.literal( "1.0" ).cast( Double.class )
+			) );
+			var result = entityManager.createQuery( query ).getSingleResult();
+			assertEquals( 69, result[0] );
+			assertEquals( 69L, result[1] );
+			assertEquals(1.0F, result[2] );
+			assertEquals(1.0D, result[3] );
+		} );
+	}
+}