schema_migrations.version is an INTEGER in test db

You should submit a failing test or a patch - http://guides.rails.info/contrib...

Thanks !

I ran into the same problem in 2.3.5, and it seems to be an issue with the prefix, as it was resolved once I dropped the prefix and monkey-patched the migrator to look for the prefix-less schema_migrations table. e.g:

module ActiveRecord
  class Migrator
    class << self
      def schema_migrations_table_name
        return 'schema_migrations' if Base.connection.table_exists?('schema_migrations')
        Base.table_name_prefix + 'schema_migrations' + Base.table_name_suffix
      end
    end
  end
end