1 files changed, 6 insertions, 1 deletions
diff --git a/activerecord/test/cases/relation/mutation_test.rb b/activerecord/test/cases/relation/mutation_test.rb
index c81a3002d6..1da5c36e1c 100644
--- a/activerecord/test/cases/relation/mutation_test.rb
+++ b/activerecord/test/cases/relation/mutation_test.rb
@@ -24,13 +24,18 @@ module ActiveRecord
       @relation ||= Relation.new FakeKlass.new('posts'), Post.arel_table
     end
 
-    (Relation::MULTI_VALUE_METHODS - [:references, :extending, :order, :unscope]).each do |method|
+    (Relation::MULTI_VALUE_METHODS - [:references, :extending, :order, :unscope, :select]).each do |method|
       test "##{method}!" do
         assert relation.public_send("#{method}!", :foo).equal?(relation)
         assert_equal [:foo], relation.public_send("#{method}_values")
       end
     end
 
+    test "#_select!" do
+      assert relation.public_send("_select!", :foo).equal?(relation)
+      assert_equal [:foo], relation.public_send("select_values")
+    end
+
     test '#order!' do
       assert relation.order!('name ASC').equal?(relation)
       assert_equal ['name ASC'], relation.order_values