Merge branch 'fix/builds-api-nil-commit' into 'master'

Fix builds API response that did not include commit data

## What does this MR do?

This is fix for problem with builds API response not including information about commit this build is created for.

## What are the relevant issue numbers?

Closes #18476 

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !4827

3 files changed, 35 insertions, 8 deletions

diff --git a/spec/models/build_spec.rb b/spec/models/build_spec.rb
index 479b7309579..8154001cf46 100644
--- a/spec/models/build_spec.rb
+++ b/spec/models/build_spec.rb
@@ -2,7 +2,12 @@ require 'spec_helper'
 
 describe Ci::Build, models: true do
   let(:project) { create(:project) }
-  let(:pipeline) { create(:ci_pipeline, project: project) }
+
+  let(:pipeline) do
+    create(:ci_pipeline, project: project,
+                         sha: project.commit.id)
+  end
+
   let(:build) { create(:ci_build, pipeline: pipeline) }
 
   it { is_expected.to validate_presence_of :ref }
@@ -658,4 +663,10 @@ describe Ci::Build, models: true do
       end
     end
   end
+
+  describe '#commit' do
+    it 'returns commit pipeline has been created for' do
+      expect(build.commit).to eq project.commit
+    end
+  end
 end
diff --git a/spec/models/commit_status_spec.rb b/spec/models/commit_status_spec.rb
index 8fb605fff8a..96397d7c8a9 100644
--- a/spec/models/commit_status_spec.rb
+++ b/spec/models/commit_status_spec.rb
@@ -1,8 +1,13 @@
 require 'spec_helper'
 
 describe CommitStatus, models: true do
-  let(:pipeline) { FactoryGirl.create :ci_pipeline }
-  let(:commit_status) { FactoryGirl.create :commit_status, pipeline: pipeline }
+  let(:project) { create(:project) }
+
+  let(:pipeline) do
+    create(:ci_pipeline, project: project, sha: project.commit.id)
+  end
+
+  let(:commit_status) { create(:commit_status, pipeline: pipeline) }
 
   it { is_expected.to belong_to(:pipeline) }
   it { is_expected.to belong_to(:user) }
@@ -13,7 +18,7 @@ describe CommitStatus, models: true do
 
   it { is_expected.to delegate_method(:sha).to(:pipeline) }
   it { is_expected.to delegate_method(:short_sha).to(:pipeline) }
-  
+
   it { is_expected.to respond_to :success? }
   it { is_expected.to respond_to :failed? }
   it { is_expected.to respond_to :running? }
@@ -116,7 +121,7 @@ describe CommitStatus, models: true do
       it { is_expected.to be > 0.0 }
     end
   end
-  
+
   describe :latest do
     subject { CommitStatus.latest.order(:id) }
 
@@ -198,4 +203,10 @@ describe CommitStatus, models: true do
       end
     end
   end
+
+  describe '#commit' do
+    it 'returns commit pipeline has been created for' do
+      expect(commit_status.commit).to eq project.commit
+    end
+  end
 end
diff --git a/spec/requests/api/builds_spec.rb b/spec/requests/api/builds_spec.rb
index ac85f340922..47e9253a10c 100644
--- a/spec/requests/api/builds_spec.rb
+++ b/spec/requests/api/builds_spec.rb
@@ -9,8 +9,8 @@ describe API::API, api: true  do
   let!(:project) { create(:project, creator_id: user.id) }
   let!(:developer) { create(:project_member, :developer, user: user, project: project) }
   let!(:reporter) { create(:project_member, :reporter, user: user2, project: project) }
-  let(:pipeline) { create(:ci_pipeline, project: project)}
-  let(:build) { create(:ci_build, pipeline: pipeline) }
+  let!(:pipeline) { create(:ci_pipeline, project: project, sha: project.commit.id) }
+  let!(:build) { create(:ci_build, pipeline: pipeline) }
 
   describe 'GET /projects/:id/builds ' do
     let(:query) { '' }
@@ -23,6 +23,11 @@ describe API::API, api: true  do
         expect(json_response).to be_an Array
       end
 
+      it 'returns correct values' do
+        expect(json_response).not_to be_empty
+        expect(json_response.first['commit']['id']).to eq project.commit.id
+      end
+
       context 'filter project with one scope element' do
         let(:query) { 'scope=pending' }
 
@@ -132,7 +137,7 @@ describe API::API, api: true  do
 
   describe 'GET /projects/:id/builds/:build_id/trace' do
     let(:build) { create(:ci_build, :trace, pipeline: pipeline) }
-    
+
     before { get api("/projects/#{project.id}/builds/#{build.id}/trace", api_user) }
 
     context 'authorized user' do