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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Metrics::BackgroundTransaction do
let(:transaction) { described_class.new }
let(:prometheus_metric) { instance_double(Prometheus::Client::Metric, base_labels: {}) }
before do
allow(described_class).to receive(:prometheus_metric).and_return(prometheus_metric)
end
describe '#run' do
it 'yields the supplied block' do
expect { |b| transaction.run(&b) }.to yield_control
end
it 'stores the transaction in the current thread' do
transaction.run do
expect(Thread.current[described_class::BACKGROUND_THREAD_KEY]).to eq(transaction)
end
end
it 'removes the transaction from the current thread upon completion' do
transaction.run { }
expect(Thread.current[described_class::BACKGROUND_THREAD_KEY]).to be_nil
end
end
describe '#labels' do
it 'provides labels with endpoint_id and feature_category' do
Labkit::Context.with_context(feature_category: 'projects', caller_id: 'TestWorker') do
expect(transaction.labels).to eq({ endpoint_id: 'TestWorker', feature_category: 'projects' })
end
end
end
RSpec.shared_examples 'metric with labels' do |metric_method|
it 'measures with correct labels and value' do
value = 1
expect(prometheus_metric).to receive(metric_method).with({ endpoint_id: 'TestWorker', feature_category: 'projects' }, value)
Labkit::Context.with_context(feature_category: 'projects', caller_id: 'TestWorker') do
transaction.send(metric_method, :test_metric, value)
end
end
end
describe '#increment' do
let(:prometheus_metric) { instance_double(Prometheus::Client::Counter, :increment, base_labels: {}) }
it_behaves_like 'metric with labels', :increment
end
describe '#set' do
let(:prometheus_metric) { instance_double(Prometheus::Client::Gauge, :set, base_labels: {}) }
it_behaves_like 'metric with labels', :set
end
describe '#observe' do
let(:prometheus_metric) { instance_double(Prometheus::Client::Histogram, :observe, base_labels: {}) }
it_behaves_like 'metric with labels', :observe
end
end
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