Ruby on Rails: test logs output presence within Rails.logger (through Minitest too)

require 'test_helper'

class MyTest < ActionDispatch::IntegrationTest
 def with_logger_introspection(&block)
 orig_logger = Rails.logger.dup
 @logger_output = StringIO.new
 begin
 Rails.logger = ActiveSupport::Logger.new(@logger_output)
 block.call(@logger_output)
 ensure
 Rails.logger = orig_logger
 end
 end

 test "Something is logged" do
 with_logger_introspection do |logger_output|
 # do something
 assert logger_output.string.include? "Something"
 end
 end
end

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