Merge branch '18681-pipelines-merge-request' into 'master'

Resolve "Pipelines for merge request"

## What does this MR do?
Adds `Pipelines` tab in merge request view

## What are the relevant issue numbers?
Closes #18681 

## Screenshots (if relevant)
![Screen_Shot_2016-08-16_at_3.22.41_PM](/uploads/c04febab3765b1fac2bf3bbfb9882f9f/Screen_Shot_2016-08-16_at_3.22.41_PM.png)

See merge request !5485

2 files changed, 75 insertions, 0 deletions

diff --git a/spec/features/merge_requests/pipelines_spec.rb b/spec/features/merge_requests/pipelines_spec.rb
new file mode 100644
index 00000000000..9c4c0525267
--- /dev/null
+++ b/spec/features/merge_requests/pipelines_spec.rb
@@ -0,0 +1,48 @@
+require 'spec_helper'
+
+feature 'Pipelines for Merge Requests', feature: true, js: true do
+  include WaitForAjax
+
+  given(:user) { create(:user) }
+  given(:merge_request) { create(:merge_request) }
+  given(:project) { merge_request.target_project }
+
+  before do
+    project.team << [user, :master]
+    login_as user
+  end
+
+  context 'with pipelines' do
+    let!(:pipeline) do
+      create(:ci_empty_pipeline,
+             project: merge_request.source_project,
+             ref: merge_request.source_branch,
+             sha: merge_request.diff_head_sha)
+    end
+
+    before do
+      visit namespace_project_merge_request_path(project.namespace, project, merge_request)
+    end
+
+    scenario 'user visits merge request pipelines tab' do
+      page.within('.merge-request-tabs') do
+        click_link('Pipelines')
+      end
+      wait_for_ajax
+
+      expect(page).to have_selector('.pipeline-actions')
+    end
+  end
+
+  context 'without pipelines' do
+    before do
+      visit namespace_project_merge_request_path(project.namespace, project, merge_request)
+    end
+
+    scenario 'user visits merge request page' do
+      page.within('.merge-request-tabs') do
+        expect(page).to have_no_link('Pipelines')
+      end
+    end
+  end
+end
diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index 35a4418ebb3..acb75ec21a9 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -456,6 +456,20 @@ describe MergeRequest, models: true do
     subject { create :merge_request, :simple }
   end
 
+  describe '#commits_sha' do
+    let(:commit0) { double('commit0', sha: 'sha1') }
+    let(:commit1) { double('commit1', sha: 'sha2') }
+    let(:commit2) { double('commit2', sha: 'sha3') }
+
+    before do
+      allow(subject.merge_request_diff).to receive(:commits).and_return([commit0, commit1, commit2])
+    end
+
+    it 'returns sha of commits' do
+      expect(subject.commits_sha).to contain_exactly('sha1', 'sha2', 'sha3')
+    end
+  end
+
   describe '#pipeline' do
     describe 'when the source project exists' do
       it 'returns the latest pipeline' do
@@ -480,6 +494,19 @@ describe MergeRequest, models: true do
     end
   end
 
+  describe '#all_pipelines' do
+    let!(:pipelines) do
+      subject.merge_request_diff.commits.map do |commit|
+        create(:ci_empty_pipeline, project: subject.source_project, sha: commit.id, ref: subject.source_branch)
+      end
+    end
+
+    it 'returns a pipelines from source projects with proper ordering' do
+      expect(subject.all_pipelines).not_to be_empty
+      expect(subject.all_pipelines).to eq(pipelines.reverse)
+    end
+  end
+
   describe '#participants' do
     let(:project) { create(:project, :public) }