Merge branch '21444-pipeliens-new-mr' into 'master'

Add pipelines tab to new MR

#### What does this MR do?
Adds pipelines tab to new MRs

#### Screenshots (if relevant)
![Screen_Shot_2016-10-10_at_10.23.27_AM](/uploads/6c3f8f2be0cf9ba7cc78f6d918307ec0/Screen_Shot_2016-10-10_at_10.23.27_AM.png)
![Screen_Shot_2016-10-11_at_8.59.45_AM](/uploads/e67577d92327eafef6f04073f3d94212/Screen_Shot_2016-10-11_at_8.59.45_AM.png)

#### What are the relevant issue numbers?
Closes #21444

See merge request !6238

1 files changed, 41 insertions, 17 deletions

diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index 1acc8d748af..6db5e7f7d80 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -640,32 +640,56 @@ describe MergeRequest, models: true do
   end
 
   describe '#all_commits_sha' do
-    let(:all_commits_sha) do
-      subject.merge_request_diffs.flat_map(&:commits).map(&:sha).uniq
-    end
+    context 'when merge request is persisted' do
+      let(:all_commits_sha) do
+        subject.merge_request_diffs.flat_map(&:commits).map(&:sha).uniq
+      end
 
-    shared_examples 'returning all SHA' do
-      it 'returns all SHA from all merge_request_diffs' do
-        expect(subject.merge_request_diffs.size).to eq(2)
-        expect(subject.all_commits_sha).to eq(all_commits_sha)
+      shared_examples 'returning all SHA' do
+        it 'returns all SHA from all merge_request_diffs' do
+          expect(subject.merge_request_diffs.size).to eq(2)
+          expect(subject.all_commits_sha).to eq(all_commits_sha)
+        end
       end
-    end
 
-    context 'with a completely different branch' do
-      before do
-        subject.update(target_branch: 'v1.0.0')
+      context 'with a completely different branch' do
+        before do
+          subject.update(target_branch: 'v1.0.0')
+        end
+
+        it_behaves_like 'returning all SHA'
       end
 
-      it_behaves_like 'returning all SHA'
+      context 'with a branch having no difference' do
+        before do
+          subject.update(target_branch: 'v1.1.0')
+          subject.reload # make sure commits were not cached
+        end
+
+        it_behaves_like 'returning all SHA'
+      end
     end
 
-    context 'with a branch having no difference' do
-      before do
-        subject.update(target_branch: 'v1.1.0')
-        subject.reload # make sure commits were not cached
+    context 'when merge request is not persisted' do
+      context 'when compare commits are set in the service' do
+        let(:commit) { spy('commit') }
+
+        subject do
+          build(:merge_request, compare_commits: [commit, commit])
+        end
+
+        it 'returns commits from compare commits temporary data' do
+          expect(subject.all_commits_sha).to eq [commit, commit]
+        end
       end
 
-      it_behaves_like 'returning all SHA'
+      context 'when compare commits are not set in the service' do
+        subject { build(:merge_request) }
+
+        it 'returns array with diff head sha element only' do
+          expect(subject.all_commits_sha).to eq [subject.diff_head_sha]
+        end
+      end
     end
   end