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require 'prometheus/client'
require 'prometheus/client/gauge'
require 'examples/metric_example'
describe Prometheus::Client::Gauge do
let(:gauge) { Prometheus::Client::Gauge.new(:foo, 'foo description', test: nil) }
before do
allow(Prometheus::Client.configuration).to receive(:value_class).and_return(Prometheus::Client::SimpleValue)
end
it_behaves_like Prometheus::Client::Metric do
let(:type) { Float }
end
describe '#set' do
it 'sets a metric value' do
expect do
gauge.set({}, 42)
end.to change { gauge.get }.from(0).to(42)
end
it 'sets a metric value for a given label set' do
expect do
expect do
gauge.set({ test: 'value' }, 42)
end.to(change { gauge.get(test: 'value') }.from(0).to(42))
end.to_not(change { gauge.get })
end
end
describe '#increment' do
it 'increments a metric value' do
gauge.set({}, 1)
expect do
gauge.increment({}, 42)
end.to change { gauge.get }.from(1).to(43)
end
it 'sets a metric value for a given label set' do
gauge.increment({ test: 'value' }, 1)
expect do
expect do
gauge.increment({ test: 'value' }, 42)
end.to(change { gauge.get(test: 'value') }.from(1).to(43))
end.to_not(change { gauge.get })
end
end
describe '#decrement' do
it 'decrements a metric value' do
gauge.set({}, 10)
expect do
gauge.decrement({}, 1)
end.to change { gauge.get }.from(10).to(9)
end
it 'sets a metric value for a given label set' do
gauge.set({ test: 'value' }, 10)
expect do
expect do
gauge.decrement({ test: 'value' }, 5)
end.to(change { gauge.get(test: 'value') }.from(10).to(5))
end.to_not(change { gauge.get })
end
end
end
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