Add spec for Pipeline DELETE for developers

spec/requests/api/pipelines_spec.rb

@@ -473,11 +473,28 @@ describe API::Pipelines do
     end
 
     context 'unauthorized user' do
-      it 'should return a 404' do
-        get api("/projects/#{project.id}/pipelines/#{pipeline.id}", non_member)
+      context 'when user is not member' do
+        it 'should return a 404' do
+          delete api("/projects/#{project.id}/pipelines/#{pipeline.id}", non_member)
 
-        expect(response).to have_gitlab_http_status(404)
-        expect(json_response['message']).to eq '404 Project Not Found'
+          expect(response).to have_gitlab_http_status(404)
+          expect(json_response['message']).to eq '404 Project Not Found'
+        end
+      end
+
+      context 'when user is developer' do
+        let(:developer) { create(:user) }
+
+        before do
+          project.add_developer(developer)
+        end
+
+        it 'should return a 403' do
+          delete api("/projects/#{project.id}/pipelines/#{pipeline.id}", developer)
+
+          expect(response).to have_gitlab_http_status(403)
+          expect(json_response['message']).to eq '403 Forbidden'
+        end
       end
     end
   end