merge requests on system hook admin page

app/views/admin/hooks/_form.html.haml

@@ -38,6 +38,13 @@
           %strong Tag push events
         %p.light
           This URL will be triggered when a new tag is pushed to the repository
+    %div
+      = form.check_box :merge_requests_events, class: 'pull-left'
+      .prepend-left-20
+        = form.label :merge_requests_events, class: 'list-label' do
+          %strong Merge Request events
+        %p.light
+          This URL will be triggered when a merge request is created/updated/merged
 .form-group
   = form.label :enable_ssl_verification, 'SSL verification', class: 'control-label checkbox'
   .col-sm-10

spec/features/admin/admin_hooks_spec.rb

 require 'spec_helper'
 
-describe 'Admin::Hooks', :js do
-  before do
-    @project = create(:project)
-    sign_in(create(:admin))
+describe 'Admin::Hooks' do
+  let(:user) { create(:admin) }
 
-    @system_hook = create(:system_hook)
+  before do
+    sign_in(user)
   end
 
   describe 'GET /admin/hooks' do
@@ -13,15 +12,17 @@ describe 'Admin::Hooks', :js do
       visit admin_root_path
 
       page.within '.nav-sidebar' do
-        click_on 'Hooks'
+        click_on 'System Hooks', match: :first
       end
 
       expect(current_path).to eq(admin_hooks_path)
     end
 
     it 'has hooks list' do
+      system_hook = create(:system_hook)
+
       visit admin_hooks_path
-      expect(page).to have_content(@system_hook.url)
+      expect(page).to have_content(system_hook.url)
     end
   end
 
@@ -43,6 +44,10 @@ describe 'Admin::Hooks', :js do
   describe 'Update existing hook' do
     let(:new_url) { generate(:url) }
 
+    before do
+      create(:system_hook)
+    end
+
     it 'updates existing hook' do
       visit admin_hooks_path
 
@@ -58,6 +63,10 @@ describe 'Admin::Hooks', :js do
   end
 
   describe 'Remove existing hook' do
+    before do
+      create(:system_hook)
+    end
+
     context 'removes existing hook' do
       it 'from hooks list page' do
         visit admin_hooks_path
@@ -76,7 +85,8 @@ describe 'Admin::Hooks', :js do
 
   describe 'Test', :js do
     before do
-      WebMock.stub_request(:post, @system_hook.url)
+      system_hook = create(:system_hook)
+      WebMock.stub_request(:post, system_hook.url)
       visit admin_hooks_path
 
       find('.hook-test-button.dropdown').click
@@ -85,4 +95,49 @@ describe 'Admin::Hooks', :js do
 
     it { expect(current_path).to eq(admin_hooks_path) }
   end
+
+  context 'Merge request hook' do
+    describe 'New Hook' do
+      let(:url) { generate(:url) }
+
+      it 'adds new hook' do
+        visit admin_hooks_path
+
+        fill_in 'hook_url', with: url
+        uncheck 'Repository update events'
+        check 'Merge Request events'
+
+        expect { click_button 'Add system hook' }.to change(SystemHook, :count).by(1)
+        expect(current_path).to eq(admin_hooks_path)
+        expect(page).to have_content(url)
+      end
+    end
+
+    describe 'Test', :js do
+      before do
+        system_hook = create(:system_hook)
+        WebMock.stub_request(:post, system_hook.url)
+      end
+
+      it 'fails if the user does not have any repository with a merge request' do
+        visit admin_hooks_path
+        find('.hook-test-button.dropdown').click
+        click_link 'Merge requests events'
+
+        expect(page).to have_content 'Ensure one of your projects has merge requests.'
+      end
+
+      it 'succeeds if the user has a repository with a merge request' do
+        project = create(:project, :repository)
+        create(:project_member, user: user, project: project)
+        create(:merge_request, source_project: project)
+
+        visit admin_hooks_path
+        find('.hook-test-button.dropdown').click
+        click_link 'Merge requests events'
+
+        expect(page).to have_content 'Hook executed successfully'
+      end
+    end
+  end
 end