require 'spec_helper' describe Gitlab::SidekiqMiddleware::MemoryKiller do subject { described_class.new } let(:pid) { 999 } let(:worker) { double(:worker, class: 'TestWorker') } let(:job) { { 'jid' => 123 } } let(:queue) { 'test_queue' } def run thread = subject.call(worker, job, queue) { nil } thread&.join end before do allow(subject).to receive(:get_rss).and_return(10.kilobytes) allow(subject).to receive(:pid).and_return(pid) end context 'when MAX_RSS is set to 0' do before do stub_const("#{described_class}::MAX_RSS", 0) end it 'does nothing' do expect(subject).not_to receive(:sleep) run end end context 'when MAX_RSS is exceeded' do before do stub_const("#{described_class}::MAX_RSS", 5.kilobytes) end it 'sends the STP, TERM and KILL signals at expected times' do expect(subject).to receive(:sleep).with(15 * 60).ordered expect(Process).to receive(:kill).with('SIGSTP', pid).ordered expect(subject).to receive(:sleep).with(30).ordered expect(Process).to receive(:kill).with('SIGTERM', pid).ordered expect(subject).to receive(:sleep).with(10).ordered expect(Process).to receive(:kill).with('SIGKILL', pid).ordered run end end context 'when MAX_RSS is not exceeded' do before do stub_const("#{described_class}::MAX_RSS", 15.kilobytes) end it 'does nothing' do expect(subject).not_to receive(:sleep) run end end end