HHH-2951 test case

hibernate-core/src/test/java/org/hibernate/test/criteria/CriteriaQueryTest.java

@@ -2047,5 +2047,31 @@ public class CriteriaQueryTest extends BaseCoreFunctionalTestCase {
 		s.close();
     }
     
+    @Test
+    @TestForIssue( jiraKey = "HHH-2951" )
+    public void testNullCriteria() {
+    	Course course = new Course();
+    	course.setCourseCode( "1234" );
+    	course.setDescription( null );
+    	
+    	Session s = openSession();
+		Transaction t = s.beginTransaction();
+		
+		s.persist( course );
+		s.flush();
+		s.clear();
+		
+		// Ensure Restrictions creates "where foo is null", instead of
+		// "where foo = null"
+		List<Course> courses = s.createCriteria( Course.class ).add(
+				Restrictions.eq( "description", null) ).list();
+		
+		assertEquals( courses.size(), 1 );
+		assertEquals( courses.get( 0 ).getCourseCode(), course.getCourseCode() );
+		
+		t.rollback();
+		s.close();
+    }
+
 }