来自 csv.read 模拟文件的 rspec 测试结果

问题描述

我正在使用 ruby​​ 1.9 并且我正在尝试进行 BDD.我的第一个测试应该在 csv 中读取"有效，但第二个我需要模拟文件对象的测试无效.

I'm using ruby 1.9 and I'm trying to do BDD. My first test 'should read in the csv' works, but the second where I require a file object to be mocked doesn't.

这是我的模型规格:

require 'spec_helper'

describe Person do
  describe "Importing data" do
    let(:person) { Person.new }

    let(:data) { "title	surname	firstname	
title2	surname2	firstname2	
"}
    let(:result) {[["title","surname","firstname"],["title2","surname2","firstname2"]] }

    it "should read in the csv" do
      CSV.should_receive(:read).
        with("filename", :row_sep => "
", :col_sep => "	")
      person.import("filename")
    end

    it "should have result" do
      filename = mock(File, :exists? => true, :read => data)
      person.import(filename).should eq(result)
    end
  end
end

这是目前的代码:

class Person < ActiveRecord::Base
  attr_accessor :import_file

  def import(filename)
    CSV.read(filename, :row_sep => "
", :col_sep => "	")
  end
end

我基本上想模拟一个文件，这样当 CSV 方法尝试从文件中读取时，它会返回我的数据变量.然后我可以测试它是否等于我的结果变量.

I basically want to mock a file so that when the CSV method tries to read from the file it returns my data variable. Then I can test if it equals my result variable.

推荐答案

您可以存根 File.open:

let(:data) { "title	surname	firstname
title2	surname2	firstname2
" }
let(:result) {[["title","surname","firstname"],["title2","surname2","firstname2"]] }

it "should parse file contents and return a result" do
  expect(File).to receive(:open).with("filename","rb") { StringIO.new(data) }
  person.import("filename").should eq(result)
end

StringIO 本质上包装了一个字符串并使其表现得像一个 IO 对象(在本例中为 File)

StringIO essentially wraps a string and makes it behave like an IO object (a File in this case)

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