1 files changed, 119 insertions, 0 deletions
diff --git a/spec/services/ci/create_pipeline_service/dry_run_spec.rb b/spec/services/ci/create_pipeline_service/dry_run_spec.rb
new file mode 100644
index 00000000000..93378df80f0
--- /dev/null
+++ b/spec/services/ci/create_pipeline_service/dry_run_spec.rb
@@ -0,0 +1,119 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Ci::CreatePipelineService do
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:user) { create(:admin) }
+  let(:ref) { 'refs/heads/master' }
+  let(:service) { described_class.new(project, user, { ref: ref }) }
+
+  subject { service.execute(:push, dry_run: true) }
+
+  before do
+    stub_ci_pipeline_yaml_file(config)
+  end
+
+  describe 'dry run' do
+    shared_examples 'returns a non persisted pipeline' do
+      it 'does not persist the pipeline' do
+        expect(subject).not_to be_persisted
+        expect(subject.id).to be_nil
+      end
+
+      it 'does not process the pipeline' do
+        expect(Ci::ProcessPipelineService).not_to receive(:new)
+
+        subject
+      end
+
+      it 'does not schedule merge request head pipeline update' do
+        expect(service).not_to receive(:schedule_head_pipeline_update)
+
+        subject
+      end
+    end
+
+    context 'when pipeline is valid' do
+      let(:config) { gitlab_ci_yaml }
+
+      it_behaves_like 'returns a non persisted pipeline'
+
+      it 'returns a valid pipeline' do
+        expect(subject.error_messages).to be_empty
+        expect(subject.yaml_errors).to be_nil
+        expect(subject.errors).to be_empty
+      end
+    end
+
+    context 'when pipeline is not valid' do
+      context 'when there are syntax errors' do
+        let(:config) do
+          <<~YAML
+            rspec:
+              script: echo
+              something: wrong
+          YAML
+        end
+
+        it_behaves_like 'returns a non persisted pipeline'
+
+        it 'returns a pipeline with errors', :aggregate_failures do
+          error_message = 'jobs:rspec config contains unknown keys: something'
+
+          expect(subject.error_messages.map(&:content)).to eq([error_message])
+          expect(subject.errors).not_to be_empty
+          expect(subject.yaml_errors).to eq(error_message)
+        end
+      end
+
+      context 'when there are logical errors' do
+        let(:config) do
+          <<~YAML
+            build:
+              script: echo
+              stage: build
+              needs: [test]
+            test:
+              script: echo
+              stage: test
+          YAML
+        end
+
+        it_behaves_like 'returns a non persisted pipeline'
+
+        it 'returns a pipeline with errors', :aggregate_failures do
+          error_message = 'build job: need test is not defined in prior stages'
+
+          expect(subject.error_messages.map(&:content)).to eq([error_message])
+          expect(subject.errors).not_to be_empty
+        end
+      end
+
+      context 'when there are errors at the seeding stage' do
+        let(:config) do
+          <<~YAML
+            build:
+              stage: build
+              script: echo
+              rules:
+                - if: '$CI_MERGE_REQUEST_ID'
+            test:
+              stage: test
+              script: echo
+              needs: ['build']
+          YAML
+        end
+
+        it_behaves_like 'returns a non persisted pipeline'
+
+        it 'returns a pipeline with errors', :aggregate_failures do
+          error_message = "test: needs 'build'"
+
+          expect(subject.error_messages.map(&:content)).to eq([error_message])
+          expect(subject.errors).not_to be_empty
+        end
+      end
+    end
+  end
+end