Question

使用Ruby / Rails获得了一些单元测试正则表达式问题。

运行：

Rails 4.0.0
Ruby 2.0.0-p247
RVM 1.23.5
Mac OSX 10.8.5

编写一个applicaton_helper方法，该方法将根据日期的距离格式化日期。这是方法：

module ApplicationHelper
  def humanize_datetime time
    time = Time.at(time)
    date = time.to_date

    today   = Date.today

    time_format = "%-I:%M %p"

    #if the time is within today, we simply use the time
    if date == today
      time.strftime time_format

    # if  the time is within the week, we show day of the week and the time
    elsif today - date < 7
      time.strftime "%a #{time_format}"

    # if time falls before this week, we should the date (e.g. Oct 30)
    else
      time.strftime "%b %e"
    end
  end
end

这似乎给出了预期的结果，但由于某种原因，以下测试失败了：

require 'test_helper'

class ApplicationHelperTest < ActionView::TestCase

  test "humanize_dateime should display only time when datetime is within today" do
    formatted = humanize_datetime Time.now
    assert_match /\A\d{1,2}\:\d\d (AM|PM)\z/, formatted
  end

  test "humanize_datetime should display day of week and time when datetime is not today but within week" do
    yesterday_formatted = humanize_datetime (Date.today - 1).to_time # yesterday
    assert_match /\A[a-zA-z]{3} \d{1,2}\:\d\d (AM|PM)\z/, yesterday_formatted

    within_week_formatted = humanize_datetime (Date.today - 6).to_time # just within this week
    assert_match /\A[a-zA-z]{3} \d{1,2}\:\d\d (AM|PM)\z/, within_week_formatted
   end

   test "humanize_datetime should display date when datetime is before this week" do
     last_week_formatted = humanize_datetime (Date.today - 7).to_time
     assert_match /\A[a-zA-Z]{3} \d{1,2}\z/, last_week_formatted
   end
end

最后一次测试失败，给出了

1）失败： ApplicationHelperTest＃test_humanize_datetime_should_display_date_when_datetime_is_before_this_week [/Users/mohammad/rails_projects/stopsmoking/test/helpers/application_helper_test.rb:20]：预期/ \ A [a-zA-Z] {3} \ d {1,2} \ z /匹配“Oct 8”。

鉴于正则表达式看起来不错，我已经在http://rubular.com/上测试了表达式，这真的很棒。这里的所有其他测试都在通过。我还尝试在\d之后删除字符串分隔符的开头/结尾和量词。

有关为何发生这种情况的任何想法？

Answer 1

如果日期为＆lt; humanize_datetime，则"%b %e"会增加额外的空间10，因为"Oct 8"。结果字符串不是"Oct 8"，而是"%b %-d"。

您应该使用{{1}}或更改正则表达式。

编辑：减去前缀可能不适用于所有系统，有关详细信息，请参阅this答案。

Ruby on Rails单元测试在日期测试中失败

1 个答案: