require 'spec_helper' describe Gitlab::Metrics::RequestsRackMiddleware do let(:app) { double('app') } subject { described_class.new(app) } describe '#call' do let(:status) { 100 } let(:env) { { 'REQUEST_METHOD' => 'GET' } } let(:stack_result) { [status, {}, 'body'] } before do allow(app).to receive(:call).and_return(stack_result) end context '@app.call succeeds with 200' do before do allow(app).to receive(:call).and_return([200, nil, nil]) end it 'increments requests count' do expect(described_class).to receive_message_chain(:http_request_total, :increment).with(method: 'get') subject.call(env) end RSpec::Matchers.define :a_positive_execution_time do match { |actual| actual > 0 } end it 'measures execution time' do expect(described_class).to receive_message_chain(:http_request_duration_seconds, :observe).with({ status: 200, method: 'get' }, a_positive_execution_time) Timecop.scale(3600) { subject.call(env) } end end context '@app.call throws exception' do let(:http_request_duration_seconds) { double('http_request_duration_seconds') } before do allow(app).to receive(:call).and_raise(StandardError) allow(described_class).to receive(:http_request_duration_seconds).and_return(http_request_duration_seconds) end it 'increments exceptions count' do expect(described_class).to receive_message_chain(:rack_uncaught_errors_count, :increment) expect { subject.call(env) }.to raise_error(StandardError) end it 'increments requests count' do expect(described_class).to receive_message_chain(:http_request_total, :increment).with(method: 'get') expect { subject.call(env) }.to raise_error(StandardError) end it "does't measure request execution time" do expect(described_class.http_request_duration_seconds).not_to receive(:increment) expect { subject.call(env) }.to raise_error(StandardError) end end end end