ruby-on-rails – 如何在spec_helper.rb中指定自定义格式化程序？

我正在使用Rspec测试开发一个Rails项目,需要很长时间才能运行.为了弄清楚哪些花了这么多时间,我想我会为RSpec制作一个自定义格式化程序并打印出每个例子的持续时间：

require 'rspec/core/formatters/base_formatter'

class TimestampFormatter < RSpec::Core::Formatters::BaseFormatter

  def initialize(output)
    super(output)
    @last_start = 0
  end

  def example_started(example)
    super(example)
    output.print "Example started: " << example.description
    @last_start = Time.new
  end

  def example_passed(example)
    super(example)
    output.print "Example finished"
    now = Time.new
    time_diff = now - @last_start

    hours,minutes,seconds,frac = Date.day_fraction_to_time(time_diff)
    output.print "Time elapsed: #{hours} hours, #{minutes} minutes and #{seconds} seconds"    
  end
end

在我的spec_helper.rb中,我尝试了以下方法：

RSpec.configure do |config|      
  config.formatter = :timestamp
end

但是在运行rspec时我最终得到以下错误：

configuration.rb:217:in `formatter=': Formatter 'timestamp' unknown - maybe you meant 'documentation' or 'progress'?. (ArgumentError)

如何将自定义格式化程序作为符号提供？

config.formatter = :timestamp

这是错的.对于自定义格式化程序,您需要指定完整的类名称

# if you load it manually
config.formatter = TimestampFormatter
# or if you do not want to autoload it by rspec means, but it should be in
# search path
config.formatter = 'TimestampFormatter'