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在 Mac OSX 上运行simplecov时，生成的覆盖范围几乎没有意义。

如果运行以下测试：

rails test test/models/channel_test.rb
> 4 runs, 4 assertions, 0 failures, 0 errors, 0 skips
> Coverage report generated for Minitest to /Volumes/[...]/coverage. 0 / 0 LOC (100.0%) covered.

然而，当运行rails test test/models图形输出时显示test/models/channel_test.rb

require "test_helper" 
class ChannelTest < ActiveSupport::TestCase 
  test "invalid if name not defined" do  
    channel = Channel.new(priority: 1, unit_cost: 1, daily_limit: 9999) 
    assert_not channel.valid?  
    assert_not channel.save, "Saved the channel without a name"
  end

更新 我认为可能是所选的测试语法可能是一个缺陷 - 我添加了一个补充测试，结果仍然报告
给模型 3 relevant lines. 0 lines covered and 3 lines missed.

class Channel < ApplicationRecord # red

  validates :name, presence: true # red

end # red

因此测试通过了，但覆盖结果令人困惑：

a）作为一个独立的，覆盖计数是0/0，而测试通过

b) 什么构成一个miss或相反coverage的（？）测试？

test_helper.rb

 require 'simplecov'
 SimpleCov.start

ENV['RAILS_ENV'] ||= 'test'
require_relative "../config/environment"
require "rails/test_help"
require 'webmock/minitest'


class ActiveSupport::TestCase
  parallelize(workers: :number_of_processors)


  fixtures :all

  def log_in_as(user, shop)
    post user_session_url, params: { user_id: user.id, active_shop_id: @site.shop_id }
  end

end

更新 2 根据@BroiSatse 的建议，注释掉parallelize(workers: :number_of_processors) 可以衡量覆盖率。

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