require 'spec_helper' describe Gitlab::Daemon do subject { described_class.new } before do allow(subject).to receive(:start_working) allow(subject).to receive(:stop_working) end describe '.instance' do before do allow(Kernel).to receive(:at_exit) end after do described_class.instance_variable_set(:@instance, nil) end it 'provides instance of Daemon' do expect(described_class.instance).to be_instance_of(described_class) end it 'subsequent invocations provide the same instance' do expect(described_class.instance).to eq(described_class.instance) end it 'creates at_exit hook when instance is created' do expect(described_class.instance).not_to be_nil expect(Kernel).to have_received(:at_exit) end end describe 'when Daemon is enabled' do before do allow(subject).to receive(:enabled?).and_return(true) end describe 'when Daemon is stopped' do describe '#start' do it 'starts the Daemon' do expect { subject.start.join }.to change { subject.thread? }.from(false).to(true) expect(subject).to have_received(:start_working) end end describe '#stop' do it "doesn't shutdown stopped Daemon" do expect { subject.stop }.not_to change { subject.thread? } expect(subject).not_to have_received(:start_working) end end end describe 'when Daemon is running' do before do subject.start.join end describe '#start' do it "doesn't start running Daemon" do expect { subject.start.join }.not_to change { subject.thread? } expect(subject).to have_received(:start_working).once end end describe '#stop' do it 'shutdowns Daemon' do expect { subject.stop }.to change { subject.thread? }.from(true).to(false) expect(subject).to have_received(:stop_working) end end end end describe 'when Daemon is disabled' do before do allow(subject).to receive(:enabled?).and_return(false) end describe '#start' do it "doesn't start working" do expect(subject.start).to be_nil expect { subject.start }.not_to change { subject.thread? } expect(subject).not_to have_received(:start_working) end end describe '#stop' do it "doesn't stop working" do expect { subject.stop }.not_to change { subject.thread? } expect(subject).not_to have_received(:stop_working) end end end end