1 files changed, 74 insertions, 0 deletions
diff --git a/spec/lib/gitlab/sidekiq_middleware/memory_killer_spec.rb b/spec/lib/gitlab/sidekiq_middleware/memory_killer_spec.rb
new file mode 100644
index 00000000000..ff8c0825ee4
--- /dev/null
+++ b/spec/lib/gitlab/sidekiq_middleware/memory_killer_spec.rb
@@ -0,0 +1,74 @@
+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 TSTP, TERM and KILL signals at expected times' do
+      expect(subject).to receive(:sleep).with(15 * 60).ordered
+      expect(Process).to receive(:kill).with('SIGTSTP', 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
+
+    it 'sends TSTP and TERM to the pid, but KILL to the pgroup, when running as process leader' do
+      allow(Process).to receive(:getpgrp) { pid }
+      allow(subject).to receive(:sleep)
+
+      expect(Process).to receive(:kill).with('SIGTSTP', pid).ordered
+      expect(Process).to receive(:kill).with('SIGTERM', pid).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