Add specs for pipeline builder that validates config

spec/lib/gitlab/ci/pipeline/chain/validate/config_spec.rb

+require 'spec_helper'
+
+describe Gitlab::Ci::Pipeline::Chain::Validate::Config do
+  set(:project) { create(:project) }
+  set(:user) { create(:user) }
+
+  let(:command) do
+    double('command', project: project,
+                      current_user: user,
+                      save_incompleted: true)
+  end
+
+  let!(:step) { described_class.new(pipeline, command) }
+
+  before do
+    step.perform!
+  end
+
+  context 'when pipeline has no YAML configuration' do
+    let(:pipeline) do
+      build_stubbed(:ci_pipeline, project: project)
+    end
+
+    it 'appends errors about missing configuration' do
+      expect(pipeline.errors.to_a)
+        .to include 'Missing .gitlab-ci.yml file'
+    end
+
+    it 'breaks the chain' do
+      expect(step.break?).to be true
+    end
+  end
+
+  context 'when YAML configuration contains errors' do
+    let(:pipeline) do
+      build(:ci_pipeline, project: project, config: 'invalid YAML')
+    end
+
+    it 'appends errors about YAML errors' do
+      expect(pipeline.errors.to_a)
+        .to include 'Invalid configuration format'
+    end
+
+    it 'breaks the chain' do
+      expect(step.break?).to be true
+    end
+
+    context 'when saving incomplete pipeline is allowed' do
+      let(:command) do
+        double('command', project: project,
+                          current_user: user,
+                          save_incompleted: true)
+      end
+
+      it 'fails the pipeline' do
+        expect(pipeline.reload).to be_failed
+      end
+    end
+
+    context 'when saving incomplete pipeline is not allowed' do
+      let(:command) do
+        double('command', project: project,
+                          current_user: user,
+                          save_incompleted: false)
+      end
+
+      it 'does not drop pipeline' do
+        expect(pipeline).not_to be_failed
+        expect(pipeline).not_to be_persisted
+      end
+    end
+  end
+
+  context 'when pipeline has no stages / jobs' do
+    let(:config) do
+      { rspec: {
+          script: 'ls',
+          only: ['something']
+        }
+      }
+    end
+
+    let(:pipeline) do
+      build(:ci_pipeline, project: project, config: config)
+    end
+
+    it 'appends an error about missing stages' do
+      expect(pipeline.errors.to_a)
+        .to include 'No stages / jobs for this pipeline.'
+    end
+
+    it 'breaks the chain' do
+      expect(step.break?).to be true
+    end
+  end
+
+  context 'when pipeline contains configuration validation errors' do
+    let(:config) { { rspec: { } } }
+
+    let(:pipeline) do
+      build(:ci_pipeline, project: project, config: config)
+    end
+
+    it 'appends configuration validation errors to pipeline errors' do
+      expect(pipeline.errors.to_a)
+        .to include "jobs:rspec config can't be blank"
+    end
+
+    it 'breaks the chain' do
+      expect(step.break?).to be true
+    end
+  end
+
+  context 'when pipeline is correct and complete' do
+    let(:pipeline) do
+      build(:ci_pipeline_with_one_job, project: project)
+    end
+
+    it 'does not invalidate the pipeline' do
+      expect(pipeline).to be_valid
+    end
+
+    it 'does not break the chain' do
+      expect(step.break?).to be false
+    end
+  end
+end