3 files changed, 83 insertions, 1 deletions
diff --git a/spec/lib/gitlab/ci/pipeline/chain/command_spec.rb b/spec/lib/gitlab/ci/pipeline/chain/command_spec.rb
index dab0fb51bcc..5181e9c1583 100644
--- a/spec/lib/gitlab/ci/pipeline/chain/command_spec.rb
+++ b/spec/lib/gitlab/ci/pipeline/chain/command_spec.rb
@@ -48,6 +48,24 @@ describe Gitlab::Ci::Pipeline::Chain::Command do
       end
     end
 
+    describe '#merge_request_ref_exists?' do
+      subject { command.merge_request_ref_exists? }
+
+      let!(:merge_request) { create(:merge_request, source_project: project, target_project: project) }
+
+      context 'for existing merge request ref' do
+        let(:origin_ref) { merge_request.ref_path }
+
+        it { is_expected.to eq(true) }
+      end
+
+      context 'for branch ref' do
+        let(:origin_ref) { merge_request.source_branch }
+
+        it { is_expected.to eq(false) }
+      end
+    end
+
     describe '#ref' do
       subject { command.ref }
 
diff --git a/spec/lib/gitlab/ci/pipeline/chain/validate/abilities_spec.rb b/spec/lib/gitlab/ci/pipeline/chain/validate/abilities_spec.rb
index 8ba56d73838..7d750877d09 100644
--- a/spec/lib/gitlab/ci/pipeline/chain/validate/abilities_spec.rb
+++ b/spec/lib/gitlab/ci/pipeline/chain/validate/abilities_spec.rb
@@ -10,12 +10,33 @@ describe Gitlab::Ci::Pipeline::Chain::Validate::Abilities do
 
   let(:command) do
     Gitlab::Ci::Pipeline::Chain::Command.new(
-      project: project, current_user: user, origin_ref: ref)
+      project: project, current_user: user, origin_ref: origin_ref, merge_request: merge_request)
   end
 
   let(:step) { described_class.new(pipeline, command) }
 
   let(:ref) { 'master' }
+  let(:origin_ref) { ref }
+  let(:merge_request) { nil }
+
+  shared_context 'detached merge request pipeline' do
+    let(:merge_request) do
+      create(:merge_request,
+        source_project: project,
+        source_branch: ref,
+        target_project: project,
+        target_branch: 'feature')
+    end
+
+    let(:pipeline) do
+      build(:ci_pipeline,
+        source: :merge_request_event,
+        merge_request: merge_request,
+        project: project)
+    end
+
+    let(:origin_ref) { merge_request.ref_path }
+  end
 
   context 'when users has no ability to run a pipeline' do
     before do
@@ -58,6 +79,12 @@ describe Gitlab::Ci::Pipeline::Chain::Validate::Abilities do
 
       it { is_expected.to be_truthy }
 
+      context 'when pipeline is a detached merge request pipeline' do
+        include_context 'detached merge request pipeline'
+
+        it { is_expected.to be_truthy }
+      end
+
       context 'when the branch is protected' do
         let!(:protected_branch) do
           create(:protected_branch, project: project, name: ref)
@@ -65,6 +92,12 @@ describe Gitlab::Ci::Pipeline::Chain::Validate::Abilities do
 
         it { is_expected.to be_falsey }
 
+        context 'when pipeline is a detached merge request pipeline' do
+          include_context 'detached merge request pipeline'
+
+          it { is_expected.to be_falsey }
+        end
+
         context 'when developers are allowed to merge' do
           let!(:protected_branch) do
             create(:protected_branch,
@@ -74,6 +107,12 @@ describe Gitlab::Ci::Pipeline::Chain::Validate::Abilities do
           end
 
           it { is_expected.to be_truthy }
+
+          context 'when pipeline is a detached merge request pipeline' do
+            include_context 'detached merge request pipeline'
+
+            it { is_expected.to be_truthy }
+          end
         end
       end
 
@@ -112,6 +151,12 @@ describe Gitlab::Ci::Pipeline::Chain::Validate::Abilities do
         end
 
         it { is_expected.to be_truthy }
+
+        context 'when pipeline is a detached merge request pipeline' do
+          include_context 'detached merge request pipeline'
+
+          it { is_expected.to be_truthy }
+        end
       end
 
       context 'when the tag is protected' do
diff --git a/spec/lib/gitlab/ci/pipeline/chain/validate/repository_spec.rb b/spec/lib/gitlab/ci/pipeline/chain/validate/repository_spec.rb
index a7cad423d09..2e8c9d70098 100644
--- a/spec/lib/gitlab/ci/pipeline/chain/validate/repository_spec.rb
+++ b/spec/lib/gitlab/ci/pipeline/chain/validate/repository_spec.rb
@@ -42,6 +42,25 @@ describe Gitlab::Ci::Pipeline::Chain::Validate::Repository do
     end
   end
 
+  context 'when origin ref is a merge request ref' do
+    let(:command) do
+      Gitlab::Ci::Pipeline::Chain::Command.new(
+        project: project, current_user: user, origin_ref: origin_ref, checkout_sha: checkout_sha)
+    end
+
+    let(:merge_request) { create(:merge_request, source_project: project, target_project: project) }
+    let(:origin_ref) { merge_request.ref_path }
+    let(:checkout_sha) { project.repository.commit(merge_request.ref_path).id }
+
+    it 'does not break the chain' do
+      expect(step.break?).to be false
+    end
+
+    it 'does not append pipeline errors' do
+      expect(pipeline.errors).to be_empty
+    end
+  end
+
   context 'when ref is ambiguous' do
     let(:project) do
       create(:project, :repository).tap do |proj|