Add four features tests for download buttons in different places

spec/features/projects/branches/download_buttons_spec.rb

+require 'spec_helper'
+
+feature 'Download buttons in branches page', feature: true do
+  given(:user) { create(:user) }
+  given(:role) { :developer }
+  given(:status) { 'success' }
+  given(:project) { create(:project) }
+  given(:pipeline) do
+    create(:ci_pipeline, project: project,
+                         sha: project.commit.sha,
+                         ref: project.default_branch,
+                         status: status)
+  end
+  given!(:build) do
+    create(:ci_build, :success, :artifacts,
+           pipeline: pipeline,
+           status: pipeline.status,
+           name: 'build')
+  end
+
+  background do
+    login_as(user)
+    project.team << [user, role]
+  end
+
+  describe 'when checking branches' do
+    context 'with artifacts' do
+      before do
+        visit namespace_project_branches_path(project.namespace, project)
+      end
+
+      scenario 'shows download artifacts button' do
+        expect(page).to have_link "Download '#{build.name}'"
+      end
+    end
+  end
+end

spec/features/projects/files/download_buttons_spec.rb

+require 'spec_helper'
+
+feature 'Download buttons in files tree', feature: true do
+  given(:user) { create(:user) }
+  given(:role) { :developer }
+  given(:status) { 'success' }
+  given(:project) { create(:project) }
+  given(:pipeline) do
+    create(:ci_pipeline, project: project,
+                         sha: project.commit.sha,
+                         ref: project.default_branch,
+                         status: status)
+  end
+  given!(:build) do
+    create(:ci_build, :success, :artifacts,
+           pipeline: pipeline,
+           status: pipeline.status,
+           name: 'build')
+  end
+
+  background do
+    login_as(user)
+    project.team << [user, role]
+  end
+
+  describe 'when files tree' do
+    context 'with artifacts' do
+      before do
+        visit namespace_project_tree_path(
+          project.namespace, project, project.default_branch)
+      end
+
+      scenario 'shows download artifacts button' do
+        expect(page).to have_link "Download '#{build.name}'"
+      end
+    end
+  end
+end

spec/features/projects/main/download_buttons_spec.rb

+require 'spec_helper'
+
+feature 'Download buttons in project main page', feature: true do
+  given(:user) { create(:user) }
+  given(:role) { :developer }
+  given(:status) { 'success' }
+  given(:project) { create(:project) }
+  given(:pipeline) do
+    create(:ci_pipeline, project: project,
+                         sha: project.commit.sha,
+                         ref: project.default_branch,
+                         status: status)
+  end
+  given!(:build) do
+    create(:ci_build, :success, :artifacts,
+           pipeline: pipeline,
+           status: pipeline.status,
+           name: 'build')
+  end
+
+  background do
+    login_as(user)
+    project.team << [user, role]
+  end
+
+  describe 'when checking project main page' do
+    context 'with artifacts' do
+      before do
+        visit namespace_project_path(project.namespace, project)
+      end
+
+      scenario 'shows download artifacts button' do
+        expect(page).to have_link "Download '#{build.name}'"
+      end
+    end
+  end
+end

spec/features/projects/tags/download_buttons_spec.rb

+require 'spec_helper'
+
+feature 'Download buttons in tags page', feature: true do
+  given(:user) { create(:user) }
+  given(:role) { :developer }
+  given(:status) { 'success' }
+  given(:tag) { 'v1.0.0' }
+  given(:project) { create(:project) }
+  given(:pipeline) do
+    create(:ci_pipeline, project: project,
+                         sha: project.commit.sha,
+                         ref: tag,
+                         status: status)
+  end
+  given!(:build) do
+    create(:ci_build, :success, :artifacts,
+           pipeline: pipeline,
+           status: pipeline.status,
+           name: 'build')
+  end
+
+  background do
+    login_as(user)
+    project.team << [user, role]
+  end
+
+  describe 'when checking tags' do
+    context 'with artifacts' do
+      before do
+        visit namespace_project_tags_path(project.namespace, project)
+      end
+
+      scenario 'shows download artifacts button' do
+        expect(page).to have_link "Download '#{build.name}'"
+      end
+    end
+  end
+end