140 lines
4.2 KiB
Ruby
140 lines
4.2 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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RSpec.describe Gitlab::Metrics::Methods do
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subject { Class.new { include Gitlab::Metrics::Methods } }
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shared_context 'metric' do |metric_type, *args|
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let(:docstring) { 'description' }
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let(:metric_name) { :sample_metric }
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describe "#define_metrics" do
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define_method(:call_define_metric_method) do |**args|
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subject.__send__(:define_metric, metric_type, metric_name, **args)
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end
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context 'metrics access method not defined' do
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it "defines metrics accessing method" do
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expect(subject).not_to respond_to(metric_name)
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call_define_metric_method(docstring: docstring)
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expect(subject).to respond_to(metric_name)
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end
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end
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context 'metrics access method defined' do
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before do
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call_define_metric_method(docstring: docstring)
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end
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it 'raises error when trying to redefine method' do
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expect { call_define_metric_method(docstring: docstring) }.to raise_error(ArgumentError)
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end
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context 'metric is not cached' do
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it 'calls fetch_metric' do
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expect(subject).to receive(:init_metric).with(metric_type, metric_name, docstring: docstring)
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subject.public_send(metric_name)
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end
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end
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context 'metric is cached' do
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before do
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subject.public_send(metric_name)
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end
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it 'returns cached metric' do
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expect(subject).not_to receive(:init_metric)
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subject.public_send(metric_name)
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end
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end
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end
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end
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describe "#fetch_metric" do
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let(:null_metric) { Gitlab::Metrics::NullMetric.instance }
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define_method(:call_fetch_metric_method) do |**args|
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subject.__send__(:fetch_metric, metric_type, metric_name, **args)
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end
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context "when #{metric_type} is not cached" do
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it 'initializes counter metric' do
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allow(Gitlab::Metrics).to receive(metric_type).and_return(null_metric)
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call_fetch_metric_method(docstring: docstring)
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expect(Gitlab::Metrics).to have_received(metric_type).with(metric_name, docstring, *args)
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end
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end
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context "when #{metric_type} is cached" do
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before do
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call_fetch_metric_method(docstring: docstring)
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end
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it 'uses class metric cache' do
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expect(Gitlab::Metrics).not_to receive(metric_type)
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call_fetch_metric_method(docstring: docstring)
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end
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context 'when metric is reloaded' do
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before do
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subject.reload_metric!(metric_name)
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end
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it "initializes #{metric_type} metric" do
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allow(Gitlab::Metrics).to receive(metric_type).and_return(null_metric)
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call_fetch_metric_method(docstring: docstring)
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expect(Gitlab::Metrics).to have_received(metric_type).with(metric_name, docstring, *args)
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end
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end
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end
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context 'when metric is configured with feature' do
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let(:feature_name) { :some_metric_feature }
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let(:metric) { call_fetch_metric_method(docstring: docstring, with_feature: feature_name) }
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context 'when feature is enabled' do
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before do
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stub_feature_flags(feature_name => true)
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end
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it "initializes #{metric_type} metric" do
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allow(Gitlab::Metrics).to receive(metric_type).and_return(null_metric)
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metric
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expect(Gitlab::Metrics).to have_received(metric_type).with(metric_name, docstring, *args)
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end
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end
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context 'when feature is disabled' do
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before do
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stub_feature_flags(feature_name => false)
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end
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it "returns NullMetric" do
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allow(Gitlab::Metrics).to receive(metric_type)
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expect(metric).to be_instance_of(Gitlab::Metrics::NullMetric)
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expect(Gitlab::Metrics).not_to have_received(metric_type)
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end
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end
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end
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end
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end
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include_examples 'metric', :counter, {}
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include_examples 'metric', :gauge, {}, :all
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include_examples 'metric', :histogram, {}, ::Prometheus::Client::Histogram::DEFAULT_BUCKETS
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end
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