Use strings for the table names

connection.tables returns an array of strings

activerecord/test/cases/migration/create_join_table_test.rb

@@ -12,7 +12,7 @@ def setup
 
       def teardown
         super
-        [:artists_musics, :musics_videos, :catalog].each do |table_name|
+        %w(artists_musics musics_videos catalog).each do |table_name|
           connection.drop_table table_name if connection.tables.include?(table_name)
         end
       end