Add tests for returning on SQL Server

Author: Bugadinho

delete_test.go

@@ -129,7 +129,7 @@ func TestDeleteBuilderReturning(t *testing.T) {
 	a.Equal("DELETE FROM user WHERE id = ? RETURNING id, deleted_at", sql)
 
 	sql, _ = db.BuildWithFlavor(SQLServer)
-	a.Equal("DELETE FROM user WHERE id = @p1", sql)
+	a.Equal("DELETE FROM user OUTPUT DELETED.id, DELETED.deleted_at WHERE id = @p1", sql)
 
 	sql, _ = db.BuildWithFlavor(CQL)
 	a.Equal("DELETE FROM user WHERE id = ?", sql)

insert_test.go

@@ -275,7 +275,7 @@ func TestInsertBuilderReturning(test *testing.T) {
 	a.Equal("INSERT INTO user (name) VALUES (?) RETURNING id", sql)
 
 	sql, _ = ib.BuildWithFlavor(SQLServer)
-	a.Equal("INSERT INTO user (name) VALUES (@p1)", sql)
+	a.Equal("INSERT INTO user (name) OUTPUT INSERTED.id VALUES (@p1)", sql)
 
 	sql, _ = ib.BuildWithFlavor(CQL)
 	a.Equal("INSERT INTO user (name) VALUES (?)", sql)

update_test.go

@@ -197,7 +197,7 @@ func TestUpdateBuilderReturning(t *testing.T) {
 	a.Equal("UPDATE user SET name = ? WHERE id = ? RETURNING id, updated_at", sql)
 
 	sql, _ = ub.BuildWithFlavor(SQLServer)
-	a.Equal("UPDATE user SET name = @p1 WHERE id = @p2", sql)
+	a.Equal("UPDATE user SET name = @p1 OUTPUT INSERTED.id, INSERTED.updated_at WHERE id = @p2", sql)
 
 	sql, _ = ub.BuildWithFlavor(CQL)
 	a.Equal("UPDATE user SET name = ? WHERE id = ?", sql)