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# encoding: UTF-8
require 'prometheus/client'
describe Prometheus::Client do
describe '.registry' do
it 'returns a registry object' do
expect(described_class.registry).to be_a(described_class::Registry)
end
it 'memorizes the returned object' do
expect(described_class.registry).to eql(described_class.registry)
end
end
context '.reset! and .reinitialize_on_pid_change' do
let(:metric_name) { :room_temperature_celsius }
let(:label) { { room: 'kitchen' } }
let(:value) { 21 }
let(:gauge) { Prometheus::Client::Gauge.new(metric_name, 'test') }
before do
described_class.cleanup!
described_class.reset! # registering metrics will leak into other specs
registry = described_class.registry
gauge.set(label, value)
registry.register(gauge)
expect(registry.metrics.count).to eq(1)
expect(registry.get(metric_name).get(label)).to eq(value)
end
describe '.reset!' do
it 'resets registry and clears existing metrics' do
described_class.cleanup!
described_class.reset!
registry = described_class.registry
expect(registry.metrics.count).to eq(0)
registry.register(gauge)
expect(registry.get(metric_name).get(label)).not_to eq(value)
end
end
describe '.reinitialize_on_pid_change' do
context 'with force: false' do
it 'calls `MmapedValue.reinitialize_on_pid_change`' do
expect(Prometheus::Client::MmapedValue).to receive(:reinitialize_on_pid_change).and_call_original
described_class.reinitialize_on_pid_change(force: false)
end
end
context 'without explicit :force param' do
it 'defaults to `false` and calls `MmapedValue.reinitialize_on_pid_change`' do
expect(Prometheus::Client::MmapedValue).to receive(:reinitialize_on_pid_change).and_call_original
described_class.reinitialize_on_pid_change
end
end
context 'with force: true' do
it 'calls `MmapedValue.reset_and_reinitialize`' do
expect(Prometheus::Client::MmapedValue).to receive(:reset_and_reinitialize).and_call_original
described_class.reinitialize_on_pid_change(force: true)
end
end
end
end
end
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