Add example of sorting multiple columns by descending

Author: mythz

tests/ServiceStack.OrmLite.Tests/Issues/MultiColumnOrderByDescending.cs

@@ -35,12 +35,32 @@ public class MultiColumnOrderByDescending : OrmLiteTestBase
             }
         }
 
+        [Test]
+        public void Can_sort_multiple_columns_in_descending_order()
+        {
+            using (var db = OpenDbConnection())
+            {
+                var q = db.From<Person>()
+                    .OrderByDescending(p => p.LastName)
+                    .OrderByDescending(p => p.FirstName);
+
+                var result = db.Select(q);
+
+                Assert.That(result.Count, Is.EqualTo(2));
+                Assert.That(result[0].Id, Is.EqualTo(2));
+            }
+        }
+
         [Test]
         public void Does_orderbydescending_multiple_columns_using_orderby()
         {
             using (var db = OpenDbConnection())
             {
-                var q = db.From<Person>().OrderBy(rn => new { sortA = Sql.Desc(rn.LastName), sortB = Sql.Desc(rn.FirstName) });
+                var q = db.From<Person>()
+                    .OrderBy(rn => new {
+                        sortA = Sql.Desc(rn.LastName), 
+                        sortB = Sql.Desc(rn.FirstName)
+                    });
 
                 var result = db.Select(q);
 
@@ -54,7 +74,8 @@ public void Does_orderbydescending_multiple_columns_using_orderbydescending()
         {
             using (var db = OpenDbConnection())
             {
-                var q = db.From<Person>().OrderByDescending(p => new { p.LastName, p.FirstName });
+                var q = db.From<Person>()
+                    .OrderByDescending(p => new { p.LastName, p.FirstName });
 
                 var result = db.Select(q);