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# frozen_string_literal: true
require 'fast_spec_helper'
RSpec.describe Gitlab::Metrics::Sli do
let(:prometheus) { double("prometheus") }
before do
stub_const("Gitlab::Metrics", prometheus)
end
describe 'Class methods' do
before do
described_class.instance_variable_set(:@known_slis, nil)
end
describe '.[]' do
it 'warns about an uninitialized SLI but returns and stores a new one' do
sli = described_class[:bar]
expect(described_class[:bar]).to be(sli)
end
it 'returns the same object for multiple accesses' do
sli = described_class.initialize_sli(:huzzah, [])
2.times do
expect(described_class[:huzzah]).to be(sli)
end
end
end
describe '.initialized?' do
before do
fake_total_counter(:boom)
fake_success_counter(:boom)
end
it 'is true when an SLI was initialized with labels' do
expect { described_class.initialize_sli(:boom, [{ hello: :world }]) }
.to change { described_class.initialized?(:boom) }.from(false).to(true)
end
it 'is false when an SLI was not initialized with labels' do
expect { described_class.initialize_sli(:boom, []) }
.not_to change { described_class.initialized?(:boom) }.from(false)
end
end
end
describe '#initialize_counters' do
it 'initializes counters for the passed label combinations' do
counters = [fake_total_counter(:hey), fake_success_counter(:hey)]
described_class.new(:hey).initialize_counters([{ foo: 'bar' }, { foo: 'baz' }])
expect(counters).to all(have_received(:get).with({ foo: 'bar' }))
expect(counters).to all(have_received(:get).with({ foo: 'baz' }))
end
end
describe "#increment" do
let!(:sli) { described_class.new(:heyo) }
let!(:total_counter) { fake_total_counter(:heyo) }
let!(:success_counter) { fake_success_counter(:heyo) }
it 'increments both counters for labels successes' do
sli.increment(labels: { hello: "world" }, success: true)
expect(total_counter).to have_received(:increment).with({ hello: 'world' })
expect(success_counter).to have_received(:increment).with({ hello: 'world' })
end
it 'only increments the total counters for labels when not successful' do
sli.increment(labels: { hello: "world" }, success: false)
expect(total_counter).to have_received(:increment).with({ hello: 'world' })
expect(success_counter).not_to have_received(:increment).with({ hello: 'world' })
end
end
def fake_prometheus_counter(name)
fake_counter = double("prometheus counter: #{name}")
allow(fake_counter).to receive(:get)
allow(fake_counter).to receive(:increment)
allow(prometheus).to receive(:counter).with(name.to_sym, anything).and_return(fake_counter)
fake_counter
end
def fake_total_counter(name)
fake_prometheus_counter("gitlab_sli:#{name}:total")
end
def fake_success_counter(name)
fake_prometheus_counter("gitlab_sli:#{name}:success_total")
end
end
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