{"id":405,"date":"2013-08-21T13:47:27","date_gmt":"2013-08-21T13:47:27","guid":{"rendered":"http:\/\/nicholshayes.co.uk\/blog\/?p=405"},"modified":"2013-10-31T15:52:11","modified_gmt":"2013-10-31T15:52:11","slug":"functional-tests-with-carrierwave","status":"publish","type":"post","link":"http:\/\/nicholshayes.co.uk\/blog\/?p=405","title":{"rendered":"Functional tests with Carrierwave"},"content":{"rendered":"

Carrierwave<\/a> is a really nice gem to use when you want to upload and save a file within a ruby object. But how do you test it, if you don’t use anything more that test\/unit or minitest?<\/p>\n

Most of the articles describing testing Carrierwave rely on rspec<\/a> or capybara<\/a>, but I don’t like adding test gems unless I have to. I prefer to use the test objects provided within the ruby standard library. So test\/unit and minitest. <\/p>\n

Fortunately, it is fairly easy to manage without anything complicated. All you have to realise is that when a form is submitted to a controller, the uploaded file is presented within params via a ActionDispatch::Http::UploadedFile object. <\/p>\n

So for example, I have a model SupportingDocument, which has an attribute ‘document’ that holds the CarrierWave::Uploader associated with uploaded files.<\/p>\n

class<\/span> SupportingDocument <<\/span> ActiveRecord::Base<\/span>
\n  mount_uploader :document<\/span>, SupportingDocumentUploader
\nend<\/span><\/div><\/div>\n

To functionally test the supporting_documents controller actions I added a couple of methods to my test SupportingDocumentsControllerTest, that create an UploadedFile object:<\/p>\n

  def<\/span> file
\n    @file<\/span> ||<\/span>= File<\/span>.open<\/span>(<\/span>File<\/span>.expand_path<\/span>(<\/span> '..\/..\/file\/test.txt'<\/span>, __FILE__<\/span>)<\/span>)<\/span>
\n  end<\/span>
\n
\n  def<\/span> uploaded_file_object(<\/span>klass, attribute, file, content_type = 'text\/plain'<\/span>)<\/span>
\n   
\n    filename = File<\/span>.basename<\/span>(<\/span>file.path<\/span>)<\/span>
\n    klass_label = klass.to_s<\/span>.underscore<\/span>
\n   
\n    ActionDispatch::Http::UploadedFile<\/span>.new<\/span>(<\/span>
\n      tempfile: file,
\n      filename: filename,
\n      head: %<\/span>Q{<\/span>Content-<\/span>Disposition: form-<\/span>data; name="#{klass_label}[#{attribute}]"<\/span>; filename="#{filename}"<\/span>}<\/span>,
\n      content_type: content_type
\n    )<\/span>
\n  end<\/span><\/div><\/div>\n

I was then able to use this object within a test:<\/p>\n

  def<\/span> test_create
\n    name = 'new_supporting_document'<\/span>
\n    assert_difference 'SupportingDocument.count'<\/span> do<\/span>
\n        post(<\/span>
\n          :create<\/span>,
\n          supporting_document: {<\/span>
\n            name: name,
\n            description: 'New supporting document'<\/span>,
\n            document: uploaded_file_object(<\/span>SupportingDocument, :document<\/span>, file)<\/span>
\n          }<\/span>,
\n          notification_id: notification.id<\/span>
\n        )<\/span>
\n    end<\/span>
\n    assert_response :redirect<\/span>
\n
\n    supporting_document = SupportingDocument.last<\/span>
\n    assert_equal name, supporting_document.name<\/span>
\n    assert_equal(<\/span>File<\/span>.basename<\/span>(<\/span>file.path<\/span>)<\/span>, supporting_document.document_identifier<\/span>)<\/span>
\n  end<\/span><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

Carrierwave is a really nice gem to use when you want to upload and save a file within a ruby object. But how do you test it, if you don’t use anything more that test\/unit or minitest? Most of the … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"_links":{"self":[{"href":"http:\/\/nicholshayes.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/405"}],"collection":[{"href":"http:\/\/nicholshayes.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/nicholshayes.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/nicholshayes.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/nicholshayes.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=405"}],"version-history":[{"count":10,"href":"http:\/\/nicholshayes.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/405\/revisions"}],"predecessor-version":[{"id":433,"href":"http:\/\/nicholshayes.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/405\/revisions\/433"}],"wp:attachment":[{"href":"http:\/\/nicholshayes.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=405"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/nicholshayes.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=405"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/nicholshayes.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=405"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}