Test

Remove use of deprecated mb_chars method #659

Job	Run time
RuboCop	26s
RSpec and Cucumber (2.7, gemfiles/rails-7-1.gemfile, false)	1m 28s
RSpec and Cucumber (3.0, gemfiles/rails-7-1.gemfile, false)	1m 16s
RSpec and Cucumber (3.1, gemfiles/rails-7-1.gemfile, false)	1m 32s
RSpec and Cucumber (3.2, gemfiles/rails-7-1.gemfile, false)	1m 25s
RSpec and Cucumber (3.3, gemfiles/rails-7-1.gemfile, false)	1m 15s
RSpec and Cucumber (2.5, gemfiles/rails-6-0.gemfile, false)	1m 24s
RSpec and Cucumber (2.6, gemfiles/rails-6-1.gemfile, false)	1m 27s
RSpec and Cucumber (2.7, gemfiles/rails-7-0.gemfile, false)	1m 41s
RSpec and Cucumber (3.3, gemfiles/rails-7-2.gemfile, false)	1m 24s
RSpec and Cucumber (3.3, gemfiles/rails-8-0.gemfile, false)	1m 34s
RSpec and Cucumber (3.3, gemfiles/rails-main.gemfile, true)	1m 15s
RSpec and Cucumber (ruby-head, gemfiles/rails-7-2.gemfile, false)	1m 15s
RSpec and Cucumber (jruby, gemfiles/rails-7-0.gemfile, true)	2m 37s
RSpec and Cucumber (jruby-head, gemfiles/rails-7-0.gemfile, true)	3m 3s
	23m 2s

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