csv - How to mock file to test file upload in rails 4.2.1 -

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i'm trying test action import products csv.

i'm being able first test pass. params[:file] goes controller string "#<stringio:0x007fc0d40a0bd0>" doesn't make test fail isn't correct behaviour.

the second test i'm getting following error

private method `gets' called  #<actiondispatch::http::uploadedfile:0x007fd391de0a00>

here's spec (content csv content)

  # spec/controllers/products_controller_spec.rb    describe 'post import file'     before       post :import, file: file     end      context 'with invalid data'       subject { spree::product.count }       let(:file) { stringio.new("") }       { is_expected.to eq 0 }     end      context 'with valid data'       subject { spree::product.count }       let(:file) { actiondispatch::http::uploadedfile.new(params) }        let(:params)         {           original_filename: 'file.csv',           content_type: 'text/csv',           tempfile: stringio.new(content)         }       end        { is_expected.to eq 1 }     end   end

try use rack::test::uploadedfile upload test file, this

context 'with valid data'   subject { spree::product.count }   let(:path_to_file) { rails.root.join 'spec/fixtures/file.csv' }   let(:file) { rack::test::uploadedfile.new path_to_file, 'text/csv' }    { is_expected.to eq 1 } end

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