spec/elastic_apm/metrics/jvm_set_spec.rb

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# frozen_string_literal: true

require 'spec_helper'

if defined?(JRUBY_VERSION)
  module ElasticAPM
    module Metrics
      RSpec.describe JVMSet do
        let(:config) { Config.new }

        subject { described_class.new config }

        describe 'collect' do
          context 'when disabled' do
            it 'returns' do
              subject.disable!
              expect(subject.collect).to be nil
            end
          end

          it 'disables after three errors' do
            allow(java.lang.management.ManagementFactory).to receive(:getPlatformMXBean).and_raise(Exception)

            2.times do
              subject.collect
              expect(subject).to_not be_disabled
            end

            subject.collect
            expect(subject).to be_disabled
          end

          it 'collects a metric set and prefixes keys' do
            subject.collect
            sleep 0.2
            sets = subject.collect

            expect(sets.first.samples).to match(
              :"jvm.memory.heap.used" => Integer,
              :"jvm.memory.heap.committed" => Integer,
              :"jvm.memory.heap.max" => Integer,
              :"jvm.memory.non_heap.used" => Integer,
              :"jvm.memory.non_heap.committed" => Integer,
              :"jvm.memory.non_heap.max" => Integer,
            )
            sets[1..-1].each do |set|
              expect(set.tags).to match(name: String)
              expect(set.samples).to match(
                :"jvm.memory.heap.pool.used" => Integer,
                :"jvm.memory.heap.pool.committed" => Integer,
                :"jvm.memory.heap.pool.max" => Integer,
              )
            end
          end
        end
      end
    end
  end
end