# File lib/mspec/matchers/output.rb, line 41
41:   def failure_message
42:     expected_out = "\n"
43:     actual_out = "\n"
44:     unless @out.nil?
45:       expected_out << "  $stdout: #{@out.inspect}\n"
46:       actual_out << "  $stdout: #{@stdout.chomp.inspect}\n"
47:     end
48:     unless @err.nil?
49:       expected_out << "  $stderr: #{@err.inspect}\n"
50:       actual_out << "  $stderr: #{@stderr.chomp.inspect}\n"
51:     end
52:     ["Expected:#{expected_out}", "     got:#{actual_out}"]
53:   end