Ruby 这是一个很好的测试规范

我是单元测试的新手，我很想提高自己. 我有一个任务，在那里我需要生成标签(一个代码战争形).

如果字符串为空或有&gt；=140个字符，则需要返回FALSE. 如有必要，我将离开链接:https://www.codewars.com/kata/52449b062fb80683ec000024/train/ruby

def generateHashtag(str)
  arr = str.split.map(&:capitalize)
  arr.empty? || arr.join.length >= 140 ? false : '#' + arr.join
end

p generateHashtag(" Hello there thanks for trying my Kata") # "#HelloThereThanksForTryingMyKata"
p generateHashtag("    Hello     World   "                 ) # "#HelloWorld"
p generateHashtag(""                                       ) #  false
p generateHashtag('L' * 140) # false

代码可以工作，但我对正确编写RSpec测试很感兴趣. 我是这样写的:

require 'rspec'
require './codewars/5kyu/hashtagGenerator'

describe 'generate hashtag when string length is less that 140' do
  before :each do
    generateHashtag(" Hello there thanks for trying my Kata").length < 140
  end

  describe 'adds # to the start' do
    it 'removes one space' do
      expect(generateHashtag(" Hello there thanks for trying my Kata"))
               .to eq("#HelloThereThanksForTryingMyKata")
    end

    it 'removes more than one space' do
      expect(generateHashtag("    Hello     World   ")).to eq("#HelloWorld")
    end
  end

  describe 'empty string' do
    it 'returns false' do
      expect(generateHashtag("")).to eq(false)
    end
  end
end

describe 'more than or equal to 140 characters' do
  it 'returns false' do
    expect(generateHashtag("L" * 140)).to be(false)
  end
end

测试起作用了.但我想知道你的意见:这样可以吗？使用before判断字符串的长度是否为&lt；140，这样做正确吗？有没有其他方法可以在每一块之前判断长度？抱歉，如果这个问题听起来很愚蠢的话.我可能是设计过头了: