1 files changed, 79 insertions, 0 deletions
diff --git a/spec/services/ci/create_pipeline_service/custom_yaml_tags_spec.rb b/spec/services/ci/create_pipeline_service/custom_yaml_tags_spec.rb
new file mode 100644
index 00000000000..4cf52223e38
--- /dev/null
+++ b/spec/services/ci/create_pipeline_service/custom_yaml_tags_spec.rb
@@ -0,0 +1,79 @@
+# frozen_string_literal: true
+require 'spec_helper'
+
+RSpec.describe Ci::CreatePipelineService do
+  describe '!reference tags' do
+    let_it_be(:project) { create(:project, :repository) }
+    let_it_be(:user)    { project.owner }
+
+    let(:ref) { 'refs/heads/master' }
+    let(:source) { :push }
+    let(:service) { described_class.new(project, user, { ref: ref }) }
+    let(:pipeline) { service.execute(source) }
+
+    before do
+      stub_ci_pipeline_yaml_file(config)
+    end
+
+    context 'with valid config' do
+      let(:config) do
+        <<~YAML
+        .job-1:
+          script:
+            - echo doing step 1 of job 1
+
+        .job-2:
+          before_script:
+            - ls
+          script: !reference [.job-1, script]
+
+        job:
+          before_script: !reference [.job-2, before_script]
+          script:
+            - echo doing my first step
+            - !reference [.job-2, script]
+            - echo doing my last step
+        YAML
+      end
+
+      it 'creates a pipeline' do
+        expect(pipeline).to be_persisted
+        expect(pipeline.builds.first.options).to match(a_hash_including({
+          'before_script' => ['ls'],
+          'script' => [
+            'echo doing my first step',
+            'echo doing step 1 of job 1',
+            'echo doing my last step'
+          ]
+        }))
+      end
+    end
+
+    context 'with invalid config' do
+      let(:config) do
+        <<~YAML
+        job-1:
+          script:
+            - echo doing step 1 of job 1
+            - !reference [job-3, script]
+
+        job-2:
+          script:
+            - echo doing step 1 of job 2
+            - !reference [job-3, script]
+
+        job-3:
+          script:
+            - echo doing step 1 of job 3
+            - !reference [job-1, script]
+        YAML
+      end
+
+      it 'creates a pipeline without builds' do
+        expect(pipeline).to be_persisted
+        expect(pipeline.builds).to be_empty
+        expect(pipeline.yaml_errors).to eq("!reference [\"job-3\", \"script\"] is part of a circular chain")
+      end
+    end
+  end
+end