CarrierWave comes with some RSpec matchers which will make testing more comfortable. Let's say you have an Uploader like this:
class MyUploader < CarrierWave::Uploader::Base
include CarrierWave::MiniMagick
# Create different versions of your uploaded files:
version :small do
process resize_to_fill: [100, 100]
end
version :medium do
process resize_to_fit: [200, nil]
end
version :large do
process resize_to_limit: [400, 400]
end
end
Imagine you have a class Movie with an attribute poster. In your spec file, you can add tests to check the dimensions of the several versions by writing
RSpec.describe Movie, type: :model do
include CarrierWave::Test::Matchers
describe '#poster' do
before do
@movie = create(:movie)
@movie.poster.store!(File.open('spec/fixtures/test_poster.jpg'))
end
describe '.small' do
it "scales down an image to be exactly 100 by 100 pixels" do
expect(@movie.poster.small).to have_dimensions(100, 100)
end
end
describe '.medium' do
it "scales down an image to be no wider than 200 pixels" do
expect(@movie.poster.medium).to be_no_wider_than(200)
end
end
describe '.large' do
it "scales down a landscape image to be no larger than 400 by 400 pixels" do
expect(@movie.poster.large).to be_no_larger_than(400, 400)
end
end
end
end
A more specific example can be found in the
Readme
Show archive.org snapshot
of carrierwave. A list of all matchers can be found
here
Show archive.org snapshot
.
Posted by Florian Leinsinger to makandra dev (2018-04-05 07:38)