Can you specify what do you really want to test here?

If you are testing the logic inside the each, you can do

result = { ab: "xxx" } # your expected output here
actual = books.each { |p| isbns.insert(0,"#{p.isbn}_") }
expect(result).to eq(actual)

#1 楼 @JIAZHEN 不好意思啊，我不是很懂测试怎么写，只能把代码粘给你看，我希望能按照这样的形式写出来。。但是 cmd 里面告诉我 nomethoderror：each，我真的不是很懂。。。

describe "author search" do before(:each) do @book1 = BookInStock.new("1111", "title1","author1", "genre1", 11.1,11) @book2 = BookInStock.new("2222", "title2","author1", "genre2", 22.2,22) end context "required book in the database"do it "puts book in both remote cache and localcache" do expect(@sqlite_database).to receive(:authorSearch).with('author1').and_return(@book1,@book2) expect(@dalli_client).to receive(:get).with('author1_Statement').and_return(nil) expect(@dalli_client).to receive(:get).with('author1_Statement').and_return(nil) expect(@dalli_client).to receive(:get).with('bks_author1').and_return(nil) #expect(@data_access).to receive(:each).with(@book1).and_return('1111_')

#2 楼 @wxliuzifan 哪一行报错？这里可能性很多光这样贴出代码很难 debug..

另外

expect(@sqlite_database).to receive(:authorSearch).with('author1').and_return(@book1,@book2)

你这里表达的意思是让@sqlite_database调用authorSearch方法，参数是author1, 然后第一次会返回@book1, 第二次返回@book2, 如果@sqlite_database根本没有这个方法，那当然会抛出NoMethodError

根据你的表达，我觉得你是想用 mock

allow(@sqlite_database).to receive(:authorSearch).with('author1').and_return(@book1,@book2)

然后当你接下来调用@sqlite_database.authorSearch('author1') 时，第一次会返回@book1, 第二次返回@book2

Make sense? FYI - https://coderwall.com/p/e80caq/rspec-allow-vs-expect

在 books.each 上加一行 binding.pry, 然后在命令行看看 books 是个啥对象 (nil?), 应该是更前面 books = ... 的代码有问题

#3 楼 @JIAZHEN 嗯啊嗯啊，学测试应该看什么书啊推荐一下吧

#4 楼 @luikore 好的我试试

#5 楼 @wxliuzifan The RSpec Book

If you're a QA, learn cucumber and automation.