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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Metrics::Exporter::MetricsMiddleware do
let(:app) { double(:app) }
let(:pid) { 'fake_exporter' }
let(:env) { { 'PATH_INFO' => '/path', 'REQUEST_METHOD' => 'GET' } }
subject(:middleware) { described_class.new(app, pid) }
def metric(name, method, path, status)
metric = ::Prometheus::Client.registry.get(name)
return unless metric
values = metric.values.transform_keys { |k| k.slice(:method, :path, :pid, :code) }
values[{ method: method, path: path, pid: pid, code: status.to_s }]&.get
end
before do
expect(app).to receive(:call).with(env).and_return([200, {}, []])
end
describe '#call', :prometheus do
it 'records a total requests metric' do
response = middleware.call(env)
expect(response).to eq([200, {}, []])
expect(metric(:exporter_http_requests_total, 'get', '/path', 200)).to eq(1.0)
end
it 'records a request duration histogram' do
response = middleware.call(env)
expect(response).to eq([200, {}, []])
expect(metric(:exporter_http_request_duration_seconds, 'get', '/path', 200)).to be_a(Hash)
end
end
end
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