Fix download artifacts button link:

Rails ignored unused arguments and ref_name_and_path is the last
path argument, therefore we need to concatenate that parts ourselves.

Otherwise, 'download' won't be shown at all.

app/views/projects/buttons/_download.html.haml

@@ -37,6 +37,6 @@
               %li.dropdown-header Previous Artifacts
             - artifacts.each do |job|
               %li
-                = link_to latest_succeeded_namespace_project_artifacts_path(project.namespace, project, ref, 'download', job: job.name), rel: 'nofollow' do
+                = link_to latest_succeeded_namespace_project_artifacts_path(project.namespace, project, "#{ref}/download", job: job.name), rel: 'nofollow' do
                   %i.fa.fa-download
                   %span Download '#{job.name}'

spec/features/projects/branches/download_buttons_spec.rb

@@ -33,7 +33,11 @@ feature 'Download buttons in branches page', feature: true do
       end
 
       scenario 'shows download artifacts button' do
-        expect(page).to have_link "Download '#{build.name}'"
+        href = latest_succeeded_namespace_project_artifacts_path(
+          project.namespace, project, 'binary-encoding/download',
+          job: 'build')
+
+        expect(page).to have_link "Download '#{build.name}'", href: href
       end
     end
   end

spec/features/projects/files/download_buttons_spec.rb

@@ -34,7 +34,11 @@ feature 'Download buttons in files tree', feature: true do
       end
 
       scenario 'shows download artifacts button' do
-        expect(page).to have_link "Download '#{build.name}'"
+        href = latest_succeeded_namespace_project_artifacts_path(
+          project.namespace, project, "#{project.default_branch}/download",
+          job: 'build')
+
+        expect(page).to have_link "Download '#{build.name}'", href: href
       end
     end
   end

spec/features/projects/main/download_buttons_spec.rb

@@ -33,7 +33,11 @@ feature 'Download buttons in project main page', feature: true do
       end
 
       scenario 'shows download artifacts button' do
-        expect(page).to have_link "Download '#{build.name}'"
+        href = latest_succeeded_namespace_project_artifacts_path(
+          project.namespace, project, "#{project.default_branch}/download",
+          job: 'build')
+
+        expect(page).to have_link "Download '#{build.name}'", href: href
       end
     end
   end

spec/features/projects/tags/download_buttons_spec.rb

@@ -34,7 +34,11 @@ feature 'Download buttons in tags page', feature: true do
       end
 
       scenario 'shows download artifacts button' do
-        expect(page).to have_link "Download '#{build.name}'"
+        href = latest_succeeded_namespace_project_artifacts_path(
+          project.namespace, project, "#{tag}/download",
+          job: 'build')
+
+        expect(page).to have_link "Download '#{build.name}'", href: href
       end
     end
   end