Add more tests

querydsl-jpa/src/test/java/com/querydsl/jpa/AbstractJPATest.java

@@ -735,6 +735,18 @@ public abstract class AbstractJPATest {
         assertEquals(1, query().from(company).where(company.ratingString.stringValue().startsWith("A")).fetchCount());
     }
 
+    @Test
+    public void FactoryExpressions() {
+        QCat cat = QCat.cat;
+        QCat cat2 = new QCat("cat2");
+        JPQLQuery<Tuple> query = query().from(cat).leftJoin(cat.kittens, cat2)
+                .select(Projections.tuple(cat.id, cat.name,
+                        Projections.tuple(cat2.id, cat2.name,
+                                Projections.tuple(cat2.birthdate).skipNulls()).skipNulls()));
+        assertEquals(6, query.fetch().size());
+        assertNotNull(query.limit(1).fetchOne());
+    }
+
     @Test
     @NoEclipseLink @NoOpenJPA @NoBatooJPA
     public void Fetch() {