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我正在关注 Net.Tutsplus.com 上的 Rspec 测试教程。我发现了我无法解决的问题。这里的事情。

当我运行测试时：

C:\projekt>rspec 规范/library_spec.rb --format 嵌套

我得到：

C:/projekt/spec/library_spec.rb:35:in `block (3 levels) in <top (required)>': un
defined method `books' for nil:NilClass (NoMethodError)

library_spec.rb 看起来像这样：

require "spec_helper"

    describe "Library Object" do

    before :all do
        lib_arr = [ 
        Book.new("JavaScript: The Good Parts", "Douglas Crockford", :development),
        Book.new("Designing with Web Standarts", "Jeffrey Zeldman", :design),
        Book.new("Don't Make me Think", "Steve Krug", :usability),
        Book.new("JavaScript Patterns", "Stoyan Sefanov", :development),
        Book.new("Responsive Web Design", "Ethan Marcotte", :design)
    ]

    File.open "books.yml", "w" do |f|
        f.write YAML::dump lib_arr
    end

end

before :each do
    @lib = Library.new "books.yml"

end

describe "#new" do
    context "with no parameters" do
        it "has no books" do
            lib = Library.new
            lib.books.length.should == 0
        end
end

    context "with a yaml file name parameters " do
        it "has five books"
        @lib.books.length.should == 5
    end
end
 end

由于教程说明，我将 library.rb 更改为：

require 'yaml'

 class Library
attr_accessor :books

def initalize lib_file = false
    @lib_file = lib_file
    @books = @lib_file ? YAML::load(File.read(@lib_file)) : []
    end
 end

根据教程，它应该解决“books-NoMethodError”问题，但它仍然存在。哪里有问题？

感谢帮助！

4

1 回答 1

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undefined method books for nil:NilClass (NoMethodError)只是意味着您正在调用booksnil 的方法，在这种情况下@lib。

您需要将before(:each)定义的钩子@lib放在上下文或描述块中，在您的代码中它在块中不可用describe '#new'。

it "has five books"此外，您在定义规范后错过了一个 do 。

我在下面更正了这些错误：

describe "#new" do
  before :each do
    @lib = Library.new "books.yml"
  end

  context "with no parameters" do
    it "has no books" do
      lib = Library.new
      lib.books.length.should == 0
    end
  end

  context "with a yaml file name parameters " do
    it "has five books" do
      @lib.books.length.should == 5
    end
  end
end
于 2012-09-20T09:32:03.080 回答