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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
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