我正在使用Ruby和RSpec学习测试驱动开发 . 我的程序应该在文本中找到一个给定的单词 . 第一种情况应该是假的，因为test_word以大写字母开头，而第二种情况应该在下调之后是真实的 . 当我运行spec文件时，我得到了
未定义的方法包括？'为零：NilClass`
方法和
nil的未定义方法`downcase'：NilClass
错误 . 怎么能被重新取消？
这是我的代码：
strings_spec.rb：
require_relative 'strings'
RSpec.describe BasicString do
before do
@test_word = "Courage"
@sentecne = "Success is not final, failure is not fatal: it is the courage to continue that counts!"
@text = BasicString.new(@sentence)
end
context "case-sensitive" do
it "should output interpolated text" do
result = @text.contains_word? @test_word
expect(result).to be_falsey
end
end
context "case-insensitive" do
it "should output interpolated text" do
result = @text.contains_word_ignorecase? @test_word# 'text & 'test_word' were made instance variables when 'before do' block was added.
expect(result).to be_truthy
end
end
end
strings.rb：
class BasicString
attr_reader :sentence
def initialize(sentence)#The constructor that initializes the instance variable @sentence.
@sentence = sentence
end
def contains_word?(test_word)
@sentence.include? test_word
end
def contains_word_ignorecase?(test_word)
test_word = test_word.downcase#This line downcases the test word.
@sentence.downcase.include? test_word#This test_word is downcased again for the instance variable to be sure it's downcased.
end
end
1 回答
您在前一个块中有拼写错误：
@sentecne. 因此，您最终创建了一个nil值的字符串，因为尚未定义@sentence.