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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 is my model spec: require 'spec_helper' describe Person do describe "Importing data" do let(:person) { Person.new } let(:data) { "title\tsurname\tfirstname\t\rtitle2\tsurname2\tfirstname2\t\r"} let(:result) {[["title","surname","firstname"],["title2","surname2","firstname2"]] } it "should read in the csv" do CSV.should_receive(:read). with("filename", :row_sep => "\r", :col_sep => "\t") 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 Here is the code so far: class Person < ActiveRecord::Base attr_accessor :import_file def import(filename) CSV.read(filename, :row_sep => "\r", :col_sep => "\t") end end 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.

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