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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Daemon do
subject { described_class.new }
before do
allow(subject).to receive(:run_thread)
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 '.initialize_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
context 'when instance has already been created' do
before do
described_class.instance
end
context 'and recreate flag is false' do
it 'raises an error' do
expect { described_class.initialize_instance }.to raise_error(/singleton instance already initialized/)
end
end
context 'and recreate flag is true' do
it 'calls stop on existing instance and returns new instance' do
old_instance = described_class.instance
expect(old_instance).to receive(:stop)
new_instance = described_class.initialize_instance(recreate: true)
expect(new_instance.object_id).not_to eq(old_instance.object_id)
end
end
end
end
context 'when Daemon is enabled' do
before do
allow(subject).to receive(:enabled?).and_return(true)
end
context '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(:run_thread)
end
context '@synchronous' do
context 'when @synchronous is set to true' do
subject { described_class.instance(synchronous: true) }
it 'calls join on the thread' do
# Thread has to be run in a block, expect_next_instance_of does not support this.
expect_any_instance_of(Thread).to receive(:join) # rubocop:disable RSpec/AnyInstanceOf
subject.start
end
end
context 'when @synchronous is not set to a truthy value' do
subject { described_class.instance }
it 'does not call join on the thread' do
# Thread has to be run in a block, expect_next_instance_of does not support this.
expect_any_instance_of(Thread).not_to receive(:join) # rubocop:disable RSpec/AnyInstanceOf
subject.start
end
end
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(:run_thread)
end
end
end
describe '#start_working' do
context 'when start_working fails' do
before do
expect(subject).to receive(:start_working) { false }
end
it 'does not start thread' do
expect(subject).not_to receive(:run_thread)
expect(subject.start).to eq(nil)
end
end
end
context 'when Daemon is running' do
before do
subject.start
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(:run_thread).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
context 'when stop_working raises exception' do
before do
allow(subject).to receive(:run_thread) do
sleep(1000)
end
end
it 'shutdowns Daemon' do
expect(subject).to receive(:stop_working) do
subject.thread.raise(Interrupt)
end
expect(subject.thread).to be_alive
expect { subject.stop }.not_to raise_error
expect(subject.thread).to be_nil
end
end
end
end
end
context '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(:run_thread)
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
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