Exercise test for pluck with hash values

Author: kamipo

activerecord/test/cases/calculations_test.rb

@@ -1144,10 +1144,12 @@ def test_pluck_with_includes_offset
   end
 
   def test_pluck_with_join
+    assert_equal [[2, 2], [4, 4]], Reply.includes(:topic).order(:id).pluck(:id, topics: [:id])
     assert_equal [[2, 2], [4, 4]], Reply.includes(:topic).order(:id).pluck(:id, :"topics.id")
   end
 
   def test_pluck_with_join_alias
+    assert_equal [[2, 1], [4, 3]], Reply.includes(:topic).order(:id).pluck(:id, topic: [:id])
     assert_equal [[2, 1], [4, 3]], Reply.includes(:topic).order(:id).pluck(:id, :"topic.id")
   end