rspec test result from csv.read mocking file

Question

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.

Here i

Answer 1

You can stub File.open:

let(:data) { "title\tsurname\tfirstname\rtitle2\tsurname2\tfirstname2\r" }
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 essentially wraps a string and makes it behave like an IO object (a File in this case)