How to mock file to test file upload in rails 4.2.1

Question

I'm trying to test the action to import products from a CSV.

I'm being able to get the first test to pass. The params[:file] goes to the controller as a string "#<StringIO:0x007fc0d40a0bd0>" which doesn't make my test fail but it isn't the correct behaviour.

The second test I'm getting the following error

private method `gets' called for  #<ActionDispatch::Http::UploadedFile:0x007fd391de0a00>

Here's is my spec (content is the CSV content)

  # spec/controllers/products_controller_spec.rb

  describe 'POST import with file' do
    before do
      post :import, file: file
    end

    context 'with invalid data' do
      subject { Spree::Product.count }
      let(:file) { StringIO.new("") }
      it { is_expected.to eq 0 }
    end

    context 'with valid data' do
      subject { Spree::Product.count }
      let(:file) { ActionDispatch::Http::UploadedFile.new(params) }

      let(:params) do
        {
          original_filename: 'file.csv',
          content_type: 'text/csv',
          tempfile: StringIO.new(content)
        }
      end

      it { is_expected.to eq 1 }
    end
  end

score 6 · Answer 1 · answered Jul 22 '15 at 19:57

6

Try to use Rack::Test::UploadedFile to upload a test file, something like this

context 'with valid data' do
  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' }

  it { is_expected.to eq 1 }
end

answered Jul 22 '15 at 19:57

Nikita Misharin

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This should be the accepted answer as using `Rails.root.joi('/some/file')` along with `Rack::Test::UploadedFile.new` works a charm – DaniG2k Sep 18 '19 at 07:33
`fixture_file_upload` is a convenience method provided by Rails for this, FYI. – Arpit Chauhan Nov 30 '20 at 17:19

How to mock file to test file upload in rails 4.2.1

1 Answers1