Add Normalizer specs

spec/lib/gitlab/ci/config/normalizer_spec.rb

+require 'fast_spec_helper'
+
+describe Gitlab::Ci::Config::Normalizer do
+  let(:job_name) { :rspec }
+  let(:job_config) { { script: 'rspec', parallel: 5 } }
+  let(:config) { { job_name => job_config } }
+
+  describe '.normalize_jobs' do
+    subject { described_class.normalize_jobs(config) }
+
+    it 'does not have original job' do
+      is_expected.not_to include(job_name)
+    end
+
+    it 'has parallelized jobs' do
+      job_names = described_class.send(:parallelize_job_names, job_name, 5).map(&:to_sym)
+
+      is_expected.to include(*job_names)
+    end
+
+    it 'parallelizes jobs with original config' do
+      original_config = config[job_name].except(:name)
+      configs = subject.values.map { |config| config.except(:name) }
+
+      expect(configs).to all(eq(original_config))
+    end
+  end
+
+  describe '.parallelize_job_names' do
+    subject { described_class.send(:parallelize_job_names, job_name, 5) }
+
+    it 'returns parallelized names' do
+      is_expected.to all(match(%r{#{job_name} \d+/\d+}))
+    end
+  end
+end