test a file upload using rspec - rails

You can use fixture_file_upload method to test file uploading: Put your test file in "{Rails.root}/spec/fixtures/files" directory

before :each do
  @file = fixture_file_upload('files/test_lic.xml', 'text/xml')
end

it "can upload a license" do
  post :uploadLicense, :upload => @file
  response.should be_success
end

In case you were expecting the file in the form of params['upload']['datafile']

it "can upload a license" do
  file = Hash.new
  file['datafile'] = @file
  post :uploadLicense, :upload => file
  response.should be_success
end

I am not sure if you can test file uploads using RSpec alone. Have you tried Capybara?

It's easy to test file uploads using capybara's attach_file method from a request spec.

For example (this code is a demo only):

it "can upload a license" do
  visit upload_license_path
  attach_file "uploadLicense", /path/to/file/to/upload
  click_button "Upload License"
end

it "can download an uploaded license" do
  visit license_path
  click_link "Download Uploaded License"
  page.should have_content("Uploaded License")
end

if you include Rack::Test*, simply include the test methods

describe "my test set" do
  include Rack::Test::Methods

then you can use the UploadedFile method:

post "/upload/", "file" => Rack::Test::UploadedFile.new("path/to/file.ext", "mime/type")

*NOTE: My example is based on Sinatra, which extends Rack, but should work with Rails, which also uses Rack, TTBOMK

I haven't done this using RSpec, but I do have a Test::Unit test that does something similar for uploading a photo. I set up the uploaded file as an instance of ActionDispatch::Http::UploadedFile, as follows:

test "should create photo" do
  setup_file_upload
  assert_difference('Photo.count') do
    post :create, :photo => @photo.attributes
  end
  assert_redirected_to photo_path(assigns(:photo))
end


def setup_file_upload
  test_photo = ActionDispatch::Http::UploadedFile.new({
    :filename => 'test_photo_1.jpg',
    :type => 'image/jpeg',
    :tempfile => File.new("#{Rails.root}/test/fixtures/files/test_photo_1.jpg")
  })
  @photo = Photo.new(
    :title => 'Uploaded photo', 
    :description => 'Uploaded photo description', 
    :filename => test_photo, 
    :public => true)
end

Something similar might work for you also.

This is how I did it with Rails 6, RSpec and Rack::Test::UploadedFile

describe 'POST /create' do
  it 'responds with success' do
    post :create, params: {
      license: {
        picture: Rack::Test::UploadedFile.new("#{Rails.root}/spec/fixtures/test-pic.png"),
        name: 'test'
      }
    }

    expect(response).to be_successful
  end
end

DO NOT include ActionDispatch::TestProcess or any other code unless you're sure about what you're including.

I had to add both of these includes to get it working:

describe "my test set" do
  include Rack::Test::Methods
  include ActionDispatch::TestProcess