Add finders logic and tests for shared projects feature

app/finders/projects_finder.rb

@@ -43,7 +43,8 @@ class ProjectsFinder
     if current_user
       [
         group_projects_for_user(current_user, group),
-        group.projects.public_and_internal_only
+        group.projects.public_and_internal_only,
+        group.shared_projects.visible_to_user(current_user)
       ]
     else
       [group.projects.public_only]

app/models/user.rb

@@ -818,7 +818,8 @@ class User < ActiveRecord::Base
   def projects_union
     Gitlab::SQL::Union.new([personal_projects.select(:id),
                             groups_projects.select(:id),
-                            projects.select(:id)])
+                            projects.select(:id),
+                            groups.joins(:shared_projects).select(:project_id)])
   end
 
   def ci_projects_union

app/views/admin/groups/show.html.haml

@@ -50,6 +50,22 @@
       .panel-footer
         = paginate @projects, param_name: 'projects_page', theme: 'gitlab'
 
+    - if @group.shared_projects.any?
+      .panel.panel-default
+        .panel-heading
+          Projects shared with #{@group.name}
+          %span.badge
+            #{@group.shared_projects.count}
+        %ul.well-list
+          - @group.shared_projects.sort_by(&:name).each do |project|
+            %li
+              %strong
+                = link_to project.name_with_namespace, [:admin, project.namespace.becomes(Namespace), project]
+                %span.label.label-gray
+                  = repository_size(project)
+              %span.pull-right.light
+                %span.monospace= project.path_with_namespace + ".git"
+
   .col-md-6
     - if can?(current_user, :admin_group_member, @group)
       .panel.panel-default

features/project/group_links.feature

+Feature: Project Group Links
+  Background:
+    Given I sign in as a user
+    And I own project "Shop"
+    And project "Shop" is shared with group "Ops"
+    And project "Shop" is not shared with group "Market"
+    And I visit project group links page
+
+  Scenario: I should see list of groups
+    Then I should see project already shared with group "Ops"
+    Then I should see project is not shared with group "Market"
+
+  @javascript
+  Scenario: I share project with group
+    When I select group "Market" for share
+    Then I should see project is shared with group "Market"

features/steps/project/project_group_links.rb

+class Spinach::Features::ProjectGroupLinks < Spinach::FeatureSteps
+  include SharedAuthentication
+  include SharedProject
+  include SharedPaths
+  include Select2Helper
+
+  step 'I should see project already shared with group "Ops"' do
+    page.within '.enabled-groups' do
+      expect(page).to have_content "Ops"
+    end
+  end
+
+  step 'I should see project is not shared with group "Market"' do
+    page.within '.enabled-groups' do
+      expect(page).not_to have_content "Market"
+    end
+  end
+
+  step 'I select group "Market" for share' do
+    group = Group.find_by(path: 'market')
+    select2(group.id, from: "#link_group_id")
+    select "Master", from: 'link_group_access'
+    click_button "Share"
+  end
+
+  step 'I should see project is shared with group "Market"' do
+    page.within '.enabled-groups' do
+      expect(page).to have_content "Market"
+    end
+  end
+
+  step 'project "Shop" is shared with group "Ops"' do
+    group = create(:group, name: 'Ops')
+    share_link = project.project_group_links.new(group_access: Gitlab::Access::MASTER)
+    share_link.group_id = group.id
+    share_link.save!
+  end
+
+  step 'project "Shop" is not shared with group "Market"' do
+    create(:group, name: 'Market', path: 'market')
+  end
+
+  step 'I visit project group links page' do
+    visit namespace_project_group_links_path(project.namespace, project)
+  end
+
+  def project
+    @project ||= Project.find_by_name "Shop"
+  end
+end