Question

我正在关注Net.Tutsplus.com上的Rspec测试教程。我发现问题我无法解决。这就是事情。

当我运行测试时：

C：\ projekt＆gt; rspec spec / library_spec.rb --format nested

我明白了：

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，但它仍然适用。问题在哪里？

感谢您的帮助！

Answer 1

undefined method books for nil:NilClass (NoMethodError)只是意味着您在nil的某些内容上调用方法books，在本例中为@lib。

您需要将定义before(:each)的{{1}}挂钩置于上下文或描述块中，在您的代码中@lib块中不可用。

此外，在定义describe '#new'规范后，您错过了一次。

我已在下面更正了这些错误：

it "has five books"

Net.tutorialplus.com -Rspec tutorial- NoMethodError

1 个答案: