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# frozen_string_literal: true
require 'fast_spec_helper'
RSpec.describe Gitlab::Ci::YamlProcessor::Dag do
let(:nodes) { {} }
subject(:result) { described_class.new(nodes).tsort }
context 'when it is a regular pipeline' do
let(:nodes) do
{ 'job_c' => %w(job_b job_d), 'job_d' => %w(job_a), 'job_b' => %w(job_a), 'job_a' => %w() }
end
it 'returns ordered jobs' do
expect(result).to eq(%w(job_a job_b job_d job_c))
end
end
context 'when there is a circular dependency' do
let(:nodes) do
{ 'job_a' => %w(job_c), 'job_b' => %w(job_a), 'job_c' => %w(job_b) }
end
it 'raises TSort::Cyclic' do
expect { result }.to raise_error(TSort::Cyclic, /topological sort failed/)
end
end
context 'when there are some missing jobs' do
let(:nodes) do
{ 'job_a' => %w(job_d job_f), 'job_b' => %w(job_a job_c job_e) }
end
it 'ignores the missing ones and returns in a valid order' do
expect(result).to eq(%w(job_d job_f job_a job_c job_e job_b))
end
end
end
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