Question

鉴于对TDD的所有炒作，我决定是时候深入挖掘并将其添加到要研究的事物列表中。我遇到了一个问题，我100％肯定这只是我在RSpec测试中出错的一个功能。我仍然是RSpec的新手，所以我很难搞清楚......我的方法很好用，但方法的测试没有。

方法代码（我知道我可以重构这个A LOT。这是我之前写的第一个Ruby程序之一，它解释了丑陋）

def caesar_cipher(string,offset)
   string=string.to_s
   offset=offset.to_i

   cipher=[]
   string.each_byte do |i| 
       #capital letters
       if (i>64 && i<91)
           if (i+offset)>90
               cipher << (i+offset-26).chr
           else
               cipher << (i+offset).chr
           end
       elsif (i>96 && i<123)
            if (i+offset)>122
                cipher << (i+offset-26).chr
            else
                cipher << (i+offset).chr
            end
        else
            cipher << i.chr
       end
    end
  cipher=cipher.join('')
  puts "The encrypted string is: #{cipher}"
end
puts "Enter the string you'd like to encrypt"
string=gets.chomp
puts "Enter the offset you'd like to use"
offset=gets.chomp
caesar_cipher(string,offset)

测试代码（仅针对一个通用案例，所有小写输入）

require './caesarCipher.rb'

describe "caesar_cipher"  do
    it 'should handle all lower case input' do
        caesar_cipher("abcdefg", 3).should == "defghij"
    end     
end

方法输出：

$ ruby caesarCipher.rb 
Enter the string you'd like to encrypt
abcdefg
Enter the offset you'd like to use
3
The encrypted string is: defghij

测试输出：

$ rspec spec/caesar_cipher_spec.rb 
Enter the string you'd like to encrypt
Enter the offset you'd like to use
The encrypted string is: require './caesarCipher.rb'
The encrypted string is: defghij
F

Failures:

  1) caesar_cipher should handle all lower case input
     Failure/Error: caesar_cipher("abcdefg", 3).should == "defghij"
       expected: "defghij"
            got: nil (using ==)
     # ./spec/caesar_cipher_spec.rb:5:in `block (2 levels) in <top (required)>'


Finished in 0.00542 seconds (files took 0.14863 seconds to load)
1 example, 1 failure

Failed examples:

rspec ./spec/caesar_cipher_spec.rb:4 # caesar_cipher should handle all lower case input

有关测试失败原因的任何帮助？从输出来看，它看起来像是在测试中运行了两次或者什么。

Answer 1

在此行之后添加cipher或return cipher

  puts "The encrypted string is: #{cipher}"

它应该可行

为了解释给定的修复，方法中的最后一个表达式是返回值。您已将值传递给STDOUT但未作为方法的返回值，因此RSpec失败。

基本RSpec问题 - 方法运行但测试失败

1 个答案: